Habitat and Morphology of Gardnerella vaginalis

Habitat of Gardnerella vaginalis

  • Normal flora in 40% female (small amount)
  • Found in urine
  • Rarely in blood and wound
  • Found in the anorectal flora of healthy adults of both sexes and as well as children.
  • Isolated from normal vagina of reproductive age female & male urethra (partners of women with bacterial vaginosis).
  • Optimum pH for growth in between 6 and 7.
  • Implicated in case of cervical cancer and infection in urinary tract
  • Frequently present in vagina of asymptomatic patients.

Habitat and Morphology of Gardnerella vaginalis

Morphology of Gardnerella vaginalis

  • Small
  • SIze: 1.28 x 0.3-0.6µm
  • Non-sporulation
  • Non-motile
  • Non capsulated or endospore formed
  • Non filamentous
  • Gram negative ,sometimes gram variable rods or coccobacilli
  • Pleomorphic with presence of metachromatic granules.
  • Presence of clue cells
  • Non- acid fast
  • Facultative anaerobic
  • Cell wall laminated

Genome of Gardnerella vaginalis

  • Circular DNA
  • Size: 1.67 Mb to 1.72 Mb
  • G + C content = 42 to 44%
  • No plasmids have been discovered yet

About Author

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Sagar Aryal, PhD

Dr. Sagar Aryal is a microbiologist, researcher, and science communicator from Nepal. He is also co-founder and Research Head of the Department of Natural Products at the Kathmandu Research Institute for Biological Sciences (KRIBS), where he leads research on natural product discovery and microbial biodiversity. Dr. Aryal earned his Ph.D. in Microbiology from Tribhuvan University, Kathmandu, Nepal, in 2025, supported by a DAAD Research Grant and a University Grants Commission (UGC) Nepal Ph.D. Fellowship. His research interests include Actinomycetes, Myxobacteria, microbial taxonomy, and natural products, particularly the discovery of bioactive compounds with potential pharmaceutical applications. He isolated and identified Nocardia nepalensis, a novel bacterial species from Nepal, contributing to understanding microbial diversity in the region. Dr. Aryal has published more than 16 research articles in international journals and contributed three book chapters to established academic publications. He has presented scientific research findings and developed international research collaborations through visits to more than 18 countries across Asia, Europe, North America, and Oceania. From 2023 to 2025, he served as the American Society for Microbiology (ASM) Young Ambassador to Nepal. Since December 2025, he has served as an Editorial Board Member of Scientific Reports, a Nature Portfolio journal. In recognition of his scientific contributions, Dr. Aryal received the NAST Science and Technology Youth Award 2025 from the Nepal Academy of Science and Technology. He previously received the Frs. Locke and Stiller Research Award (LSRA) for the 2017-2018 cycle from St. Xavier's College, Kathmandu, and a Nepal Academy of Science and Technology (NAST) Research Grant for 2017-2018. Alongside his scientific career, Dr. Aryal has more than 15 years of experience in blogging, content writing, and search engine optimization (SEO).

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