Gardnerella vaginalis
G. vaginalis was
earlier known as Corynebacterium vaginalis
or Haemophilus vaginalis.
Since the bacterium does not requireX and V growth factors, it has been shifted
from the genus Haemophilus and has
been placed in the genus Gardnerella.
Thebacterium is present as a commensal in the male urethra and vagina. G. vaginalis are small, pleomorphic, Gram-negative
rods, which are sometimes Gram variable. They are nonsporing, nonmotile, and
noncapsulated. G. vaginalis causes
nonspecific vaginitis and cervicitis, frequently in association with anaero-bic
vaginosis. The condition is characterized by foul-smelling vaginal discharge
with a fishy odor and acidic pH.
High vaginal swab or endocervical swab with exudate material is the
specimen required for diagnosis of the condi-tion. The specimens are
transported in the Stuart medium. Gram staining of the smear shows
Gram-variable small bacilli and presence of clue cells. These clue cells are
the vaginal epithelial cells covered with many small Gram-variable rods. The
bacteria is cultured on a blood agar and incubated anaer-obically at 37°C for
48 hours for colonies. The colonies of G.
vaginalis are identified by Gram staining, negative catalasetest, and
positive hippurate hydrolysis test.
G. vaginalis is sensitive to penicillin,
ampicillin, andtrimethoprim. It is resistant to gentamicin, nalidixic acid, and
colistin. Metronidazole is the drug of choice.
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