Chir, B.

staph aureus perineal perineal carriers carrier perineum number contamination subject organism perineal area table perineal staph faece strain carriage colony survey perineal carriage result student perineal skin ridley investigation table i table v phage individual faecal contamination faecal scrotum plate clothing surface gland medium dispersal group skin swabs occasion perineal strain multiplication perineal contamination perineal swabs persistence thoma clothing contamination non-carrier perineum r distribution growth phage pattern phage type 24 hours degree ability state pattern right neighbouring areas perineal areas perineal carrier minute period phenolphthalein diphosphate 30 colonies month january 25 strains phage groups i professor psychiat subject den jan throat neurol figure groin louis jenner laboratory population group ii staph staphylococci