<prompt> Which is the most common preceding infection in bone marrow failure syndromes?Parvo B19EBVHIVHepatitis  <response>: Most common infection preceding bone marrow failure syndrome is hepatitis. It is usually sero negative non-A, non- B, non - C . It accounts for 5 of etiologies. Parvo virus can cause pure red cell aplasia, but it doesnt usually cause generalised bone marrow failure. Ref: Harrisons principles of internal medicine, 21st edition, page 664 