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Volume 26, Number 8—August 2020

Rise in Babesiosis Cases, Pennsylvania, USA, 2005–2018

David IngramComments to Author  and Tonya Crook
Author affiliations: Penn State Health Milton S. Hershey Medical Center, Hershey, Pennsylvania, USA

Main Article

Table 1

Centers for Disease Control and Prevention criteria for diagnosis of confirmed cases of babesiosis, 2011*

Laboratory criteria for diagnosis Clinical criteria for diagnosis
Identification of intraerythrocytic Babesia organisms by light microscopy in a Giemsa, Wright, or Wright-Giemsa–stained blood smear; OR detection of Babesia microti DNA in a whole blood specimen by PCR; OR detection of Babesia spp. genomic sequences in a whole blood specimen by nucleic acid amplification; OR Isolation of Babesia organisms from a whole blood specimen by animal inoculation. Objective: >1 of the following: fever, anemia, or thrombocytopenia
Subjective: >1 of the following: chills, sweats, headache, myalgia, or arthralgia.

*Includes cases that have confirmatory laboratory results and meet >1 of the objective or subjective clinical evidence criteria, regardless of the mode of transmission (can include clinically manifest cases in transfusion recipients or blood donors). Full case definition available at

Main Article

Page created: June 08, 2020
Page updated: July 17, 2020
Page reviewed: July 17, 2020
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