High frequencies of exposure to the novel human parvovirus PARV4 in hemophiliacs and injection drug users, as detected by a serological assay for PARV4 antibodies. - Sharp CP; Lail A; Donfield S; Simmons R; Leen C; Klenerman P; Delwart E; Gomperts ED; Simmonds P (The Journal of infectious diseases, 2009)