Human Granulocytic Anaplasmosis
Human granulocytic anaplasmosis (HGA), formerly referred
to as human granulocytic ehrlichiosis (HGE), is caused
by the bacterium Anaplasma phagocytophilum.
Recent studies in New Jersey have shown the infection
prevalence in the blacklegged tick vector to be between
6-17%. The white-footed mouse is the probable reservoir.
Non-specific symptoms, which normally occur within 1-2
weeks following tick bite, may be mild to severe and
include fever, chills, malaise, headache, muscle aches
and pain, and nausea. Although reportable in New Jersey
since 1995, the first case of HGA was not reported until
1997 and about 5 cases are reported annually.
granulocytic Anaplasmosis Fact Sheet