Objective: Cryptococcal meningitis is one of the most important HIV-related opportunistic infections, especially in the developing world. In order to help develop global strategies and priorities for prevention and treatment, it is important to estimate the burden of cryptococcal meningitis.
Design: Global burden of disease estimation using published studies.
Methods: We used the median incidence rate of available studies in a geographic region to estimate the region-specific cryptococcal meningitis incidence; this was multiplied by the 2007 United Nations Programme on HIV/AIDS HIV population estimate for each region to estimate cryptococcal meningitis cases. To estimate deaths, we assumed a 9% 3-month case-fatality rate among high-income regions, a 55% rate among low-income and middle-income regions, and a 70% rate in sub-Saharan Africa, based on studies published in these areas and expert opinion.
Results: Published incidence ranged from 0.04 to 12% per year among persons with HIV. Sub-Saharan Africa had the highest yearly burden estimate (median incidence 3.2%, 720 000 cases; range, 144 000–1.3 million). Median incidence was lowest in Western and Central Europe and Oceania (≤0.1% each). Globally, approximately 957 900 cases (range, 371 700–1 544 000) of cryptococcal meningitis occur each year, resulting in 624 700 deaths (range, 125 000–1 124 900) by 3 months after infection.
Conclusion: This study, the first attempt to estimate the global burden of cryptococcal meningitis, finds the number of cases and deaths to be very high, with most occurring in sub-Saharan Africa. Further work is needed to better define the scope of the problem and track the epidemiology of this infection, in order to prioritize prevention, diagnosis, and treatment strategies.
aMycotic Diseases Branch, USA
bBiostatistics Office, Division of Foodborne, Bacterial, and Mycotic Diseases, USA
cGlobal AIDS Program, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
dMycology Reference Unit, National Institute for Communicable Diseases, Johannesburg, South Africa
eUniversity of Alabama at Birmingham, Birmingham, Alabama, USA.
Received 23 July, 2008
Revised 5 November, 2008
Accepted 11 November, 2008
Correspondence to Dr Benjamin J. Park, 1600 Clifton Road, MS C-09, Atlanta, GA 30333, USA. Tel: +1 404 639 1619; e-mail: Bpark1@cdc.gov