A Pseudo-Outbreak of Echinococcosis in WisconsinAnderson, Neil W. MD*; Kehl, Sue C. PhD*; Chusid, Michael J. MD†Infectious Diseases in Clinical Practice: September 2013 - Volume 21 - Issue 5 - p 323–324 doi: 10.1097/IPC.0b013e318279ee39 Case Reports Abstract Author Information Abstract: 1Echinococcosis refers to infection caused by larval stage cestodes of the genus Echinococcus. It typically manifests as a cystic mass of the liver, although cysts may be found in the lung, other visceral organs, the brain, and bones. The diagnosis of echinococcosis relies heavily on serologic testing, which can be deceiving in locales where the infection is uncommon. We recently encountered a patient with suspected echinococcosis whose diagnosis in the patient and her family members was complicated by confusing serologic results suggesting an epidemic of echinococcal infection. From the *Departments of Pathology and †Pediatrics, Medical College of Wisconsin and Children’s Hospital of Wisconsin, Milwaukee, WI. Correspondence to: Neil W. Anderson, MD, Medical College of Wisconsin, Department of Pathology, 9200 W Wisconsin Ave, Milwaukee, WI, 53226. E-mail: NAnderso@mcw.edu. The authors have no funding or conflicts of interest to disclose. © 2013 by Lippincott Williams & Wilkins.