A A Hee-Sup Kim, et al. Coinfection hepatitis A genotype IA and IIIA 325 B B Figure 1. (A) Peripheral blood smear showing marked polychromasia and anisocytosis (Wright-Giemsa stain, ×1,000). (B) Photomicrographs of a bone marrow biopsy section showing increased erythropoiesis [hematoxylin and eosin stain (H&E), ×400]. Figure 2. The liver biopsy specimen exhibited hepatocellular and canalicular cholestasis, hepatocyte ballooning, and lobular spotty necrosis, consistent with cholestatic hepatitis. Extramedullary hematopoiesis was also seen (arrow; H&E, ×200). A B Figure 3. Immunohistochemical staining of the liver biopsy specimen. Strong cytoplasmic staining for hepatitis A virus antigen was noted in our case (A), whereas staining was absent in a case of chronic hepatitis B (B) as a negative control (A and B, ×400).