This is the list of healthy

vagina In mammals, the vagina is the elastic, muscular part of the female genital tract. In humans, it extends from the vestibule to the cervix. The outer vaginal opening is normally partly covered by a thin layer of mucosal tissue called the hymen ...

l microbiota (VMB), which is defined as the group of species and

genera Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ...

that generally are found to have lack of symptoms, absence of various infections, and result in good pregnancy outcomes. VMB is dominated mainly by Lactobacillus species. This is the list of organisms that are found in the lower reproductive tract of sexually mature women who are not immunocompromised. A partial description of

pathogens In biology, a pathogen ( el, πάθος, "suffering", "passion" and , "producer of") in the oldest and broadest sense, is any organism or agent that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a ger ...

that can be found in the lower and upper reproductive tract of women can be found in the article

sexually transmitted disease Sexually transmitted infections (STIs), also referred to as sexually transmitted diseases (STDs) and the older term venereal diseases, are infections that are spread by sexual activity, especially vaginal intercourse, anal sex, and or ...

. The organisms listed below are capable of causing illness if for some reason there is a change in vaginal pH or a change in the ratio of one organism to another. For example, '' Candida'' is a normal inhabitant of a healthy reproductive tract but an overgrowth of this organism can cause candidiasis.

Normal microbiota

This is the list of the normal flora that are found in the lower reproductive tract of sexually mature women who exhibit no symptoms of illness and who are not immunocompromised. ''Lactobacilli'' predominate. These organisms protect against infection. Vaginal microbiota composition may have a genetic component.

Anaerobes

Aerobes

These bacteria may be detected as transients or are marginally discernable with PCR techniques. They are also opportunistic pathogens and their overgrowth is considered an infection though symptoms and signs may be absent. Escherichia coli (257 06) Gramnegative rods

Escherichia coli (257 06) Gramnegative rods

While the vaginal microbiota is populated predominantly by ''Lactobacillus'' spp. in 71% of women, 29% of asymptomatic, healthy women possess a microbiota essentially lacking in ''Lactobacillus'' and instead the following groups have been isolated from this population. This microbiota is affiliated with ethnicity:

Yeast

Candida albicans ''Candida albicans'' is an opportunistic pathogenic yeast that is a common member of the human gut flora. It can also survive outside the human body. It is detected in the gastrointestinal tract and mouth in 40–60% of healthy adults. It is usu ...

'' and other spp.

Microbiota changes

Pre-pubescent Preadolescence is a stage of human development following middle childhood and preceding adolescence.New Oxford American Dictionary. 2nd Edition. 2005. Oxford University Press. It commonly ends with the beginning of puberty. Preadolescence is c ...

girls, women in

menarche Menarche ( ; ) is the first menstrual cycle, or first menstrual bleeding, in female humans. From both social and medical perspectives, it is often considered the central event of female puberty, as it signals the possibility of fertility. Gir ...

, and postmenopausal women have lower populations of ''Lactobacillus'' spp. in proportion to the other species. Hormone replacement therapy in postmenopausal women restores the microbiota to that of a reproductive-aged woman. The microbiota populations change in response to the menstrual cycle. Pregnancy alters the microbiota, with a reduction in species/genus diversity. Overgrowth of ''Candida albicans'' or other ''Candida'' ( yeast infections) sometimes occurs after antibiotic therapy.

Bacterial vaginosis Bacterial vaginosis (BV) is a disease of the vagina caused by excessive growth of bacteria. Common symptoms include increased vaginal discharge that often smells like fish. The discharge is usually white or gray in color. Burning with urinati ...

results in altered populations and ratios of the normal microbiota. There has been no link demonstrated between taking oral probiotics and maintaining normal microbiota populations of lactobacilli.

References

External links

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Pelvic Inflammatory Disease (PID; Salpingitis, Endometritis)
{{portal bar, Biology Abdominal pain Bacterial diseases Bacteriology Chlamydia infections Feminine hygiene Microbiology Sexually transmitted diseases and infections Vagina Gram-positive bacteria

microbiota Microbiota are the range of microorganisms that may be commensal, symbiotic, or pathogenic found in and on all multicellular organisms, including plants. Microbiota include bacteria, archaea, protists, fungi, and viruses, and have been found ...

Lower reproductive tract of women Microbiomes

Microbiota Microbiota are the range of microorganisms that may be commensal, symbiotic, or pathogenic found in and on all multicellular organisms, including plants. Microbiota include bacteria, archaea, protists, fungi, and viruses, and have been found ...