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Position Statement

AMSSM Position Statement Update: Blood-Borne Pathogens in the Context of Sports Participation

McGrew, Christopher MD*; MacCallum, Daisy-Scarlett MD; Narducci, Dustymarie MD; Nuti, Rathna MD; Calabrese, Leonard DO§; Dimeff, Robert MD; Paul, Stephen MD; Poddar, Sourav K. MD**; Rao, Ashwin MD††; McKeag, Douglas MD‡‡

Author Information
Clinical Journal of Sport Medicine: July 2020 - Volume 30 - Issue 4 - p 283-290
doi: 10.1097/JSM.0000000000000738
  • Free



The past 20 years have witnessed significant advances in clinical and scientific research in the understanding of blood-borne pathogens (BBPs). Before 1995, there was limited scientific information concerning BBPs including HIV, hepatitis B virus (HBV), hepatitis C virus (HCV), and hepatitis D virus (HDV) as they related to sports and athletic participation. This substantial knowledge deficit led to misunderstanding and misinformation about sports-related transmission risks and whether exercise participation for those harboring these conditions should be permitted. In recognition of growing concerns by sports physicians and other health care providers, both the American Medical Society for Sports Medicine (AMSSM) and American Orthopedic Society for Sports Medicine (AOSSM) responded by examining then-known medical science of BBPs as related to sports participation.1 Other groups followed with their own sports-related HIV/AIDS/BBP statements.2–9 Subsequent scientific and clinical research has led to significant advances in our understanding of BBPs. This AMSSM position statement update, directed toward all health care providers who care for patients involved in sport and exercise, incorporates these advancements. This document is intended to act as a general guide to clinical practice based on the current state of evidence, while acknowledging the need for modification as new knowledge becomes available.


The prevalence of BBPs among athletes has not been studied extensively. A 1995 study evaluated the prevalence of HBV infection in South Australian soccer players and found no difference compared with a group of blood donors of the same age.10 A 2008 study examined the prevalence of HCV in 208 former professional and amateur Brazilian soccer and basketball players. It reported a prevalence of 7.2%, with values of 11% among professionals and 5.5% among amateurs.11 The study found a close correlation between the use of injectable stimulants and HCV infection rates. In comparison, the prevalence of BBPs in athletes who did not inject such drugs was 0.6%, suggesting that sport participation itself had little to do with the relatively high overall prevalence rates. A 2011 study involving 420 male wrestlers (high contact sport) and 205 volleyball and soccer players (low- to moderate-contact sports) found no evidence that participation in wrestling led to higher rates of HBV or HCV transmission compared with low- to moderate-contact sports.12

In athletic practices and competition, the potential route of transmission for BBPs occurs through blood from direct contact between an infected athlete with disrupted skin and/or mucous membranes of an uninfected athlete. Analysis of polymerase chain reaction for HIV RNA and proviral DNA present in eccrine sweat has verified that HIV is not transmitted through sweat or saliva.13–15 Key biological characteristics of BBPs relevant to the potential for transmission in athletic settings include the following: (1) HIV has the lowest stability/infectivity, and HBV has the highest stability/infectivity, (2) the molecular structure of the HBV allows the virus to withstand environmental surfaces for one or more weeks, and (3) HBV is highly concentrated in infected individuals making the speculative transmission risk higher when compared with HIV and HCV.13,15,16 Transmission of HCV and HIV in the health care setting remains a serious concern. Although rare, it is recommended that dental treatment be included among the risk factors for HBV and HCV infection. Multiple case reports describe possible HCV transmission through blood splash into the conjunctiva, although the viral load of the splash donors has not been reported in these cases; therefore, no infection risk has been estimated. Among the reported cases, no phylogenetic analysis has been reported between donor and recipient HCV. Risk of transmission through these methods can easily be eliminated using standard precautionary measures.15–18

Similar to the nonathletic population, high-risk behaviors outside of competition and practice, such as unprotected sex and the sharing of injection-related equipment, present the most likely route of transmission. HIV is not transmissible through casual contact, swimming pools, mosquitoes, saliva, sweat, tears, urine, feces, or inanimate objects (ie, wrestling mats, toilet seats, and sinks). Sharing of objects such as razors and toothbrushes carries at least a theoretical risk of infection and should be avoided.19–24


Approximately 37 million people worldwide are currently infected with HIV, with an estimated 2.45 million new diagnoses annually.25 Sub-Saharan Africa has the highest prevalence of HIV. New infections worldwide show declining trends.25 In the United States, approximately 1.2 million individuals are living with HIV (compared with 1 million in 1995) with approximately 40 000 new infections diagnosed every year. New infections in the United States are declining, consistent with global trends, although prevalence increases the success of Highly Active Anti-Retroviral Therapy (HAART) and other life-extending treatments.26

HIV is transmitted through sexual contact, parenteral exposure to blood and blood components, contamination of infected blood into open wounds or mucous membranes, and perinatally from an infected mother to fetus or infant. There is no evidence of transmission through other routes, such as contact in a household or athletic venue, or by viral particles in droplets suspended in the air. Transmission of HIV by sexual contact is reduced to an extremely low rate for infected patients managed with suppressive HIV treatment.27

There are no well-documented, confirmed reports of HIV transmission during sport. Only one instance of HIV infection believed to be possibly related to sports was reported in a “letter to the editor” in the medical literature. In this report, the infection was diagnosed in a recreational soccer player in Italy after head to head contact with another player who was infected with HIV.28 Public health officials in Italy, who reviewed the available data from this case, found that testing was not performed on either athlete at the time of the incident, and thus, nonathletic risk factors could not be reasonably excluded.29 In the over 27 years since this report was published, there have been no additional reported cases of HIV transmission during sport.

The theoretical risk for transmission of HIV has been estimated in the National Football League (NFL) to be less than 1 per 85 million game contacts, or less than 1 transmission in 58.6 seasons.30 This low risk assessment is likely overinflated, as it was determined using the number of observed bleeding injuries during one season and then correlating to the risk of percutaneous HIV transmission involving hollow bore needles in the health care setting. This would not be directly applicable to athletic scenarios.

Although not the equivalent of sanctioned combative sports such as boxing and mixed martial arts, transmission of HIV in street fighting has been documented in case reports.31 Increased risk of transmission was associated with high-risk behaviors (unprotected sex and needle sharing) and was tremendously reduced in any population if the infected individual was being treated with antiretroviral therapy.27,32


Approximately 2 billion people worldwide have evidence of past or present infection with HBV, and 248 million individuals are chronic carriers (ie, positive for HBV surface antigen).33 Acute hepatitis B has been declining in incidence since 1990 mainly due to effective preventive strategies such as vaccination. The Centers for Disease Control and Prevention (CDC) estimates a US prevalence of approximately 2% with a reported 2953 acute HBV cases in 2014.34 The number of Americans who are living with chronic HBV infection is growing because of the increasing prevalence of chronic carriers, despite a gradual decline in new cases. Recent CDC investigations report approximately 2.2 million chronic carriers in the United States.34

Hepatitis B virus is spread by percutaneous and mucous membrane exposures to infectious body fluids (ie, serum, semen, and saliva). The risk of transmission of HBV is 50 to 100 times higher than that of transmission of HIV.35 Explanations for this difference may include the fact that HBV is far more concentrated in blood, more stable in the environment, and can survive ex vivo for up to 7 days with the capability of causing infection during this period.

The body of evidence for transmission of HBV in sport activity is limited to 3 case series dated before the year 2000. There are no recent reports to delineate current risk. Hepatitis B virus transmission was documented in Japan in 5 members of a high school sumo-wrestling club40 and in 11 members of a Japanese university American football team.41 In both studies, horizontal transmission came from an index case through compromised skin contamination to a presumed contact. In addition, over a six-year period, a cluster of 568 cases of HBV infection was reported in Swedish cross-country track finders (orienteering).42 Inoculation with HBV during competition during the first outbreak was believed to have occurred from blood transmission from shrubs on which infected athletes had scraped themselves and from the sharing of bathtubs after race. The authors contend that, although more than one mode of transmission contributed to the spread of the disease, the likely infectious mode of transmission occurred through postcompetition common bathing. Of note, the epidemic was controlled when regulations introducing adequate protective clothing for competitors were enforced. In the nearly 2 decades since the last of these isolated and remote case series occurred, there have been no new published reports.

There are no published estimates of the risk of HBV transmission during sport, but extrapolation from NFL-based reports for HIV gives an estimate of one transmission in every 850 000 to 4.25 million game contacts for HBV,43 an extrapolation based off of the significantly flawed approach of the original NFL calculation for potential HIV transmission30

Hepatitis D virus is a defective RNA virus that requires HBV for assembly, replication, and transmission and thus can only infect those that concurrently have HBV.36,37 An estimated 10 to 20 million individuals are coinfected with HDV worldwide with a greater relative prevalence in the United States, Australia, and Europe.37–39 The modes of transmission of HDV are the same as for HBV, through blood products and body fluids.36,37,39


At least 4.6 million persons are HCV antibody–positive, and approximately 3.5 million persons are currently infected with HCV. Most patients with acute HCV infections are largely asymptomatic and do not seek medical attention.37 The CDC estimates 3.3 cases of asymptomatic acute HCV for each newly diagnosed symptomatic acute HCV case.37 In the United States, the number of HCV-related deaths (n = 15 106) exceeded the number of HIV/AIDS-related deaths (n = 12 734) for the first time in 2007 and has since continued to rise.

The most common modes of transmission of HCV occur through exposures to small quantities of blood through unsafe health care practices, injection practices, intravenous (IV) drug use, blood-tainted bodily fluids or objects, sexual transmission, and transfusions. Hepatitis C virus can survive on environmental surfaces for roughly 16 hours.44 Failure to identify infected individuals is a major obstacle to appropriate care and successful control of HCV. Appropriately screening asymptomatic patients with identifiable risk factors for HCV is an important step toward improving the detection and treatment of affected individuals.

The theoretical risk of HCV transmission in sport has not been published. There are no documented reports of transmission of HCV through sports participation in isolated case reports. Confirmed cases of transmission of HCV between teammates sharing needles for performance-enhancing injections exist.15 Hepatitis C virus transmission has also been documented after bloody combat outside of the sanctioned combative sports setting.45



Mandatory screening for BBPs is not medically justified as a condition for athletic participation or competition given the low risks of infection and transmission described above.1–9,46 These tests cannot be used effectively for prevention, the costs are excessive, and there are additional logistical, legal, and ethical considerations.16,46 Voluntary testing and screening may be recommended to all individuals, regardless of athletic participation, if one or more of the criteria which confer higher risk is met:16

  1. Multiple sexual partners;
  2. Injections of drugs (including drugs of abuse and doping with ergogenic aids);
  3. Sexual contact with at-risk individuals;
  4. Sexually transmitted infections;
  5. Blood transfusions before 1985.

The CDC and United States Preventative Services Task Force (USPSTF) both recommend HIV screening of at-risk adolescents and adults aged 15 to 65 years.47,48 Evidence is insufficient at this time to recommend an optimum time interval between screenings.47,48 Both the CDC and USPSTF also recommend that persons at high risk of infection (eg, people with HIV, men who have sex with men, people who inject drugs, and endemic parts of the world) be screened for HBV and HCV.49–51 In addition, USPSTF recommends offering one-time screening for HCV to adults born between 1945 and 1965.52 However, the CDC recommends against testing asymptomatic individuals in the general population for HBV.50 If testing is performed, the ordering health care provider is responsible for ensuring that pre-test and post-test counseling is available and testing is completed within the framework of state and federal law.46

Some specific sports' governing organizations require preparticipation screening for BBPs, including the International Federation of Associated Wrestling Styles, International Boxing Federation, International Amateur Boxing Association, and various state boxing commissions. These groups have not published any evidence-based scientific rationale for their screening requirements. Athletes in these sports should have the ability to request testing if they participate in high-risk behaviors and may have an opportunity to opt out of sport-related preparticipation BBP screening contingent on sport-specific regulations and rules.46

Specific Management and Preventive Measures for Sports Events and Practices

An understanding of the risk factors and development of precautionary procedures to reduce blood exposure are instrumental for decreasing the already small risk of transmission of BBPs in organized sports.53–55 Adherence to basic hygiene and standard precautions (formerly called universal precautions) is appropriate for all athletic settings. The following recommendations are intended to provide treatment guidelines for all providers delivering care in athletic settings:

  1. Preparation: Pre-event preparation includes proper care for pre-existing skin injuries or conditions that compromise the integrity of the protective skin barrier such as abrasions, existing or healing wounds, and dermatitis. These conditions may serve as a source of bleeding or as a point of entry for BBPs and should be covered, until completely healed, with an occlusive dressing that will withstand the stress of competition to prevent transmission.
  2. Supplies: Supplies that reduce blood exposures and are compliant with standard precautions should be used for the care of all patients and be available to caregivers. These resources include latex or vinyl gloves, face/eye shields, soap/disinfectant, bleach (freshly prepared in a 1:10 dilution with tap water) or Environmental Protection Agency (EPA)–approved germicide, safer needles (eg, self-sheathing needles, blunted suture needles, needleless connectors, and infusion sets), bandages or dressings, designated receptacles for soiled equipment or uniforms (with separate leak-proof bags or receptacles appropriately marked for uniforms and equipment contaminated with blood), and a puncture-resistant sharp disposal container.56–62 It is recommended that participants in sporting events use squeeze-type water containers to avoid direct contact with the mouth as they drink, as there is a potential risk of transmission through bleeding around the mouth.63,64
  3. Early recognition: During the sporting event, prompt recognition and appropriate response of active bleeding is the responsibility of officials, athletes, and medical personnel. Participants with bleeding should be removed from the event as soon as is practical. Bleeding must be controlled, and exposed mucus membranes should be flushed with water and wounds cleansed with soap and water. Antiseptic products are not recommended, as they do not reduce the risk of BBP transmission and damage or compromise normal tissue repair.15,28,65,66 The wound must be covered with an occlusive dressing that can withstand the stress of the activity. Once bleeding is controlled and the wounds are properly covered, the player may return safely to competition. Any participant with exposed blood or blood-containing body fluids present should change that uniform and/or cover and control an area of active bleeding before returning to competition.
  4. Reporting: Participants should be educated that it is their obligation to report all wounds and injuries in a timely manner, including those recognized before the sporting activity, and wear sport-specific appropriate protective equipment at all times (ie, mouth guards).
  5. Precautions: Standard precautions must be followed for the care of all patients with the practice of hand hygiene before and after every patient contact.67–69 Appropriate gloves are required for all interactions when direct contact with blood, body fluids, and other fluids containing blood can be anticipated. Gloves must be changed after treating each individual participant, and hands should be washed with soap and water or antiseptic after glove removal.
  6. Access to protective equipment: Personal protective equipment (PPE) namely gloves, goggles, masks, and fluid-resistant gowns, as well as airway devices should be readily accessible. The lack of protective equipment should not delay emergency care for life-threatening injuries.
  7. Decontamination: Any equipment or playing surfaces (eg, wrestling mat) contaminated with blood or potential infectious body fluids should be wiped immediately with paper towels or disposable cloths and disinfected with a daily-prepared 1:10 ratio of bleach to water solution or EPA-approved germicide.62 The cleaned area should be dry before reuse, and individuals cleaning the equipment or collecting soiled linen should wear appropriate PPE.
  8. Postevent follow-up: Postevent management may include re-evaluation and management of any wounds sustained during the sporting event, including but not limited to covering wounds, cuts and abrasions, debriding dirty wounds, and suturing clean wounds. Participants should be provided with appropriate follow-up with medical personnel for proper medical evaluation, postexposure counseling, and prophylaxis, as indicated. Blood-soiled uniforms and towels should be collected using standard precautions and laundered according to appropriate protocol: in hot water at a temperature of at least 71°C (160oF) for 25-minute cycles.62
  9. Procedures: Procedures performed in the training room and during practices must be governed by adherence to standard infectious precautions. Medical providers should be equipped with appropriate PPE when coming into contact with potential BBP. Blood, potential infectious body fluids, or other fluids containing blood should be cleaned as previously described. Equipment handlers, laundry personnel, and janitorial staff should adhere to standard precautions and be advised to wear gloves whenever contact with bloody equipment, clothing, or other items may occur. Appropriate containers for the disposal of needles, syringes, or scalpels should be available.
  10. Universal precautions: Adherence to blood exposure plans should be consistent. Complacency concerning adherence to standard (universal) precautions has been documented in a major sporting competition.70 Given anecdotal reports of transmission of HIV and HCV in bloody street fights, sports with rules against fighting (ie, all sports except North American professional hockey) should be emphasized and enforced.
  11. Prophylaxis: Pre-exposure and post-exposure prophylaxis for HIV, HBV, and HCV should be based on risk of exposure, with the exception of the hepatitis B vaccine. The strategy of vaccinating individual groups considered to be at high risk of contracting HBV has not been successful in reducing the incidence of new infections, and universal vaccination of all individuals is recommended for prevention by the World Health Organization (WHO), CDC, American Academy of Pediatrics (AAP), NFL, and the Federation Internationale de Medicine du Sport (FIMS).71–76
  12. Training: All personnel involved with sports should be trained in basic first aid and infection control, including the preventative measures outlined here.


Since the 1995 AMSSM and AOSSM statement, advances in the development of combination antiretroviral therapy (cART) for HIV have transformed the infection from a fatal and progressive disease into a complex but manageable infection for those diagnosed who receive timely evidence-based care. Effective therapy results in a near-normal life span.77 Hepatitis C virus had only been clinically recognized for 6 years in 1995, and available therapy was ineffective and had significant side effects. Today, HCV-infected patients can benefit from the development of a growing number of direct-acting antiviral agents, which are well tolerated and curative in nearly all patients with treatment durations of 12 weeks or less.78 Hepatitis B virus continues to decrease in prevalence secondary to global immunization programs, and there are now 6 approved antiviral agents to manage the infection for those who have active disease.79

Effect of Exercise on Those Infected with Blood-Borne Pathogens

Exercise has been found to be beneficial to the health and well-being of individuals infected with HIV, HCV, or HBV. Compared with controls, patients with chronic hepatitis have decreased strength, exercise time to exhaustion and performance, and increased liver enzyme elevation during endurance exercise bouts.81–85 When these patients engaged in a regular structured exercise program, they experienced improved aerobic capacity, insulin sensitivity, body mass index, quality of life, and pain and depression scores.86,87

Moderate aerobic exercise increases CD4 levels in asymptomatic HIV-positive patients. Individuals with advanced stages of HIV infection may experience increased CD4 counts and CD4:CD8 ratio in response to aerobic exercise.88 However, intense exercise may impair the ability of HIV-positive patients to mobilize neutrophils and natural killer cells.88–90 For patients on cART, moderate aerobic exercise decreases lipolysis and fatty acid oxidation, improves insulin sensitivity, decreases central adiposity, decreases anxiety and tension, and improves quality of life.91–94

Numerous systematic reviews have concluded 20 minutes of aerobic exercise performed 3 times per week for as little as 5 weeks can improve the efficiency of oxygen consumption, body composition, insulin sensitivity, depression, and other psychological symptoms. Participation in longer duration programs inhibits neurocognitive decline, improves body composition, improves both lipid profiles and glucose levels, and increases V̇o2max.95–99 Resistance exercise training increases muscle mass, strength, function, and insulin sensitivity, decreases body fat, and improves lipid profiles in HIV-positive individuals.100–105

Recent systematic reviews have concluded that combining aerobic exercise with progressive resistance exercise in HIV-infected individuals improves cognition, insulin sensitivity, lean mass, upper and lower extremity strength, endurance, exercise time to exhaustion, V̇o2max, and quality of life and depression scores. It also decreases resting heart rate.104–106 It does seem that combined programs are safe for HIV-positive patients of either sex at nearly any age and result in significant overall improvement in health.106,107

Exercise Recommendations

Exercise seems to improve overall general health and well-being with low risk of adverse effects for those individuals infected with HBV/HDV, and HCV; thus, it is recommended that those with chronic hepatitis exercise as tolerated.86 Those with acute hepatitis infection will need to limit the exercise intensity based on their general health status. Further research is needed to define specific exercise recommendations in those with acute or chronic HBV/HDV or HCV infections.

Moderate exercise is beneficial to the physical and psychological well-being of the HIV-positive patient, but strenuous exercise may be detrimental.88,95 HIV-infected individuals should begin exercising while healthy and maintain their exercise program to help manage their illness and improve their quality of life. For healthy, asymptomatic HIV-positive individuals, unrestricted exercise is acceptable. For HIV-positive athletes with mild to moderate symptoms (eg, fatigue, menstrual changes, swollen lymph nodes, mild rashes, night sweats, etc) or low CD4 counts (<200), strenuous, exhaustive exercise should be avoided. Athletes with AIDS may remain active as directed by symptomatology but should avoid strenuous exercise and reduce or stop training during acute, opportunistic illness.


Appropriate care of BBPs considers 2 goals: suppression and cure. Suppression of the infection to clinically undetectable levels is now achievable. For HIV-infected individuals, complete viral suppression is achievable in most cases. In addition, viral suppression decreases transmission risk by both sexual and nonsexual routes.32,108 The second goal, specifically for HCV-infected patients, is to cure the infection with one of the many approved combination antiviral regimens.78 After virologic cure and in the absence of advanced liver damage, return to heath is now achievable for most of the treatment-compliant patients. For HBV-infected patients, chronic and possibly lifelong viral suppression is possible, although cure is currently not achievable in the majority.80 In summary, full viral suppression is a powerful means to reduce transmission for all BBPs.


Health care providers should play a vital role in the education of patients, including athletes, regarding BBPs.109 Athletes must be educated about the risks of blood-borne disease transmission through unsafe sexual practices and needle sharing.109,110 The consistent use of condoms with water-based lubricants is recommended as a means of reducing spread. The WHO strongly advises against the use of spermicides containing nonoxynol-9 stating that it does not protect against HIV infection and is less effective in preventing pregnancy than other methods.112 Furthermore, spermicides containing nonoxynol-9 may actually increase the risk of HIV infection in women using these products frequently.112 Besides sexual practices, sharing contaminated needles for any purpose, including tattoo applications, can increase transmission risk of BBPs.111 In addition, athletes should be educated to avoid sharing personal items, such as razors, toothbrushes, and nail clippers, that carry BBP contamination risks.109 During sport-related travel to certain parts of the world, players should be made aware of potential exposure to populations with higher prevalence of BBPs and higher risk medical scenarios including unscreened blood transfusion and injections with contaminated needles.

Athletes must be educated that the risk of transmission of BBPs during athletic competition is highly unlikely, both to provide comfort and to dispel misconceptions regarding risks and routes of transmission.113 Practical hygienic measures (eg, prompt application of first aid to bleeding injuries) should be emphasized, and athletes must understand that it is in their best interest to provide timely reports regarding significant injuries to appropriate personnel.

The athletic setting affords unique opportunities for educational initiatives aimed at reducing fear and misconceptions concerning BBP transmission among individuals. Sports can be a vehicle for information sharing and may be used alongside other strategies to raise awareness of the HIV epidemic and to facilitate prevention.114 The convening power of sport can be effectively used to tackle stigma and discrimination as well as influence the most vulnerable populations with messages about HIV/AIDS prevention. The United Nations has highlighted sport as an effective platform to increase HIV/AIDS knowledge and awareness.115 For example, the first HIV/AIDS advertisement to air during Super Bowl Sunday was part of the KNOW HIV/AIDS global media campaign launched by Viacom and the Henry J. Kaiser Family Foundation in 2004.116 This form of mass media was proven effective in reaching a national audience and drawing attention to the global HIV/AIDS pandemic.115 Such examples demonstrate how sports can empower a community with facts, skills, and means for protection to halt the spread of an epidemic.115 Programs should also recognize the ability of athletes to serve as positive role models and educators, capable of connecting with at-risk groups in a manner not accessible to members of the medical community.115,117


The spread of BBPs has been proposed as potential concern in athletic participation; yet, the confirmed transmission of BBPs during sport is exceedingly rare. There are no well-documented reports of HIV, HCV, or HDV transmission during sport. There is also no evidence for universal testing for BBPs as a specific requirement for participation in sports. Competitive athletes and nonathletes should follow appropriate general public health agency recommendations for screening for BBPs, considering their individual risk factors and exposures. Although the risk of transmission for any BBP in the athletic setting is minute, common sense dictates that standard precautions be followed by anyone providing care to athletes. Exercise and athletic participation is compatible with a healthy lifestyle for everyone, including those persons living with BBPs. Those with acute symptomatic BBP infection should limit exercise intensity based on their current health status. Exercise and training do not seem to be harmful to the health of asymptomatic athletes infected with BBPs; therefore, moderate levels of exercise should be encouraged for those with BBPs. Education is the key tool for preventing BBP transmission. Future research considerations may include evaluation of the prevalence of BBP infections in competitive athletes, the effects of long-term, intense training on infected athletes, and the effects of BBP treatment therapies on performance.


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blood-borne pathogens; sports participation

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