title: Colony formation by Helicobacter pylori after long-term incubation under anaerobic conditions.
abstract: To evaluate the viability of Helicobacter pylori cultured under anaerobic conditions, H. pylori strain TK1029 was grown on blood agar in a microaerophilic environment at 37 degrees C for 4 days, and subsequently cultured under anaerobic conditions for 1 to 35 days. Colony formation by bacteria on blood agar plates cultured under anaerobic conditions was observed only for up to 4 days of microaerophilic incubation. By Gram staining, the morphological form of the bacteria was shown to be predominantly coccoid. However, bacteria cultured under anaerobic conditions for 15 to 35 days formed colonies on blood agar after pre-incubation of bacteria with PBS, but not without pre-incubation. These results suggest that H. pylori survives long-term culture under anaerobic conditions and that both pre-incubation in non-nutrient solution and high density of bacterial concentration might be important for recovery of H. pylori cultured for a prolonged time under anaerobic conditions.
authors.affiliation: Department of Microbiology, Kyorin University School of Medicine, Tokyo, Japan. hiro-ya@ta2.so-net.or.jp
authors.forename: H
authors.initials: H
authors.lastname: Yamaguchi
authors.forename: T
authors.initials: T
authors.lastname: Osaki
authors.forename: M
authors.initials: M
authors.lastname: Takahashi
authors.forename: H
authors.initials: H
authors.lastname: Taguchi
authors.forename: S
authors.initials: S
authors.lastname: Kamiya
mesh_terms: D000693:Anaerobiosis; D001431:Bacteriological Techniques; D001706:Biopsy; D015169:Colony Count, Microbial; D003470:Culture Media; D016481:Helicobacter Infections / Q000382:microbiology; D016480:Helicobacter pylori / Q000254:growth & development* / Q000502:physiology; D006801:Humans; D013270:Stomach / Q000382:microbiology
chemical_list: D003470:Culture Media