I searched PubMed, medRxiv, bioRxiv, LitCovid (LitCovid 2020), health science journals’ coronavirus center web pages, news media, and companies’ web pages, for peer-reviewed or good quality articles, preprints, research reports, and news reports specifically on transmission routes of coronavirus disease COVID-19, using the search terms “coronavirus”, “COVID-19”, “SARS-CoV-2”, “2019-nCoV”, “transmission”, “saliva”, “mucous”, “blood”, “feces”, “fecal”, “fomite”, “surface”, “droplet”, “aerosol”, “asymptomatic”, “pregnancy”, “birth”, “childbirth”, “dog”, “cat”, “sexual transmission”, “vagina”, “testes”, “semen”, and “food”.  I included original research studies of the community transmission routes of COVID-19 infected people.  I excluded publications on: nosocomial infections in health care facilities; entry into the body, pathology, medical treatment, other coronaviruses; epidemiological statistics; mathematical models and predictions; and zoonotic origins from animals.  Some news media announced summaries of original research within hours of publication, before PubMed and peer-reviewed summary articles did, so news served as quick bridges to up-to-date research.  Articles published in English, and some translated from Chinese, were included. 

Researchers are publishing new articles daily, so I will continue updating and revising these pages daily.