<prompt> The virus causing aplastic crises in patients with haemolytic anaemia isParvovirusCoxsackie virusCytomegalovirusHerpes virus  <response>: Parvovirus B19 is implicated in aplastic crisis in patients with hemolytic anemia, paicularly sickle cell disease. Parvovirus virus is the only DNA virus which has single-stranded DNA genome. Ref : Ananthanarayana textbook of Microbiology 9th edition Pgno : 554 