Human monocytic ehrlichiosis presenting as acute appendicitis during pregnancy.

Human monocytic ehrlichiosis (HME) is caused by Ehrlichia chaffeensis, an obligate intracellular bacterium that infects mononuclear phagocytic cells. We report a unique case of HME diagnosed in a woman who presented with abdominal pain and acute appendicitis during early pregnancy and whose condition progressively deteriorated to adult respiratory distress syndrome.