RT Journal Article SR Electronic(1) A1 Ryan, W. J.YR 1968 T1 An X-factor Requiring Haemophilus Species JF Microbiology, VO 52 IS 2 SP 275 OP 286 DO https://doi.org/10.1099/00221287-52-2-275 PB Microbiology Society, SN 1465-2080, AB SUMMARY: The isolation from a perianal abscess of a Haemophilus species requiring for growth the presence of X-factor but not V-factor is recorded. Two other similar strains were isolated from normal faeces. The properties of these isolates are given and compared with those of previously described species of the genus Haemophilus having the same growth requirements. The isolates form a homogeneous group resembling Haemophilus influenzae-murium., UL https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-52-2-275