Cases of anaplasmosis have increased steadily and are appearing in states where it is less common. While symptoms are usually mild, in rare cases it can cause hemophagocytic lymphohistiocytosis. Here, we present a case of polymerase chain reaction-confirmed Anaplasma phagocytophilum with morulae on peripheral blood smear associated with biopsy-proven hemophagocytic lymphohistiocytosis.
Keywords: Anaplasma phagocytophilum; anaplasmosis; hemophagocytic lymphohistiocytosis; tick-borne.
© The Author(s) 2023. Published by Oxford University Press on behalf of Infectious Diseases Society of America.