early miscarriage ≤20%: late miscarriage 1% - 2% % of pregnancies
||Human Homo sapiens
||Cools P. The role of Escherichia coli in reproductive health: state of the art. Res Microbiol. 2017 Feb 24. pii: S0923-2508(17)30037-2. doi: 10.1016/j.resmic.2017.02.002. p.2 left column 2nd paragraphPubMed ID28242352
|| P.E. Hay, Bacterial vaginosis and miscarriage, Curr Opin Infect Dis, 17 (2004), pp. 41–44  E.J. Radford, M. Hughes Women's experiences of early miscarriage: implications for nursing care J Clin Nurs, 24 (2015), pp. 1457–1465 doi: 10.1111/jocn.12781.PubMed ID15090889, 25662397
||P.2 left column 2nd paragraph: "Miscarriage is one of the most common yet under-studied adverse pregnancy outcomes. It is often defined as the spontaneous loss of pregnancy in the first 22 weeks of pregnancy, although there is no universal consensus on the cutoff used [refs 27, 37, 70]. Early miscarriage occurs in the first 3 months of pregnancy, while late miscarriages occur after three months of pregnancy but before 24 weeks, although definitions vary between countries, local practices and studies [primary source 99]. Up to one in five pregnancies ends with an early miscarriage, while late miscarriage (also named second-trimester or mid-trimester miscarriage) is less common and occurs in 1–2% of pregnancies [primary sources]."