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Approximate ranking of vaginal (lowest/most acidic highest/least acidic)
for primates with published data
(Data are species averages or medians; values vary with menstrual cycle, lactation, etc., and sample sizes
are often small.)
1. Humans (Homo sapiens) ~4.5 (uniquely acidic)
2. Chimpanzees (Pan troglodytes) ~5.4 (lowest among NHPs; most similar to
3. Olive baboons (Papio anubis) ~5.2-5.5 (also among the lowest NHPs; some reports
overall for baboons)
4. Bonobos (Pan paniscus) mean (range 5.1-7.0; varies with swelling/estrus)
5. Rhesus macaques (Macaca mulatta) ~6.1-6.4 (common lab value; stable but higher than humans
6. Yellow baboons (Papio cynocephalus) and other baboons generally in the ~5.5-6.5 range (varies
study/population) "sture.com
7. Cynomolgus macaques (Macaca fascicularis) ~744 (highest among commonly studied
macaques)
Levels Ethnicity (The "Acidity Rank")
The dominance of crispatus directly dictates the level of the environment. Lower
(more acidic) is correlated with lower diversity.
Ethnic Group Typical Range Dominant Species
White European 3.8 4.2 crispatus
East Asian 4.0 4.4 crispatus iners
Hispanic Latina 4.5 5.0 Diverse iners
African American 4.7-5.2 iners Diverse
Sub-Saharan African 5.0-6.0 Diverse (CST