About this site

How do people transmit coronavirus COVID-19 to each other, and how can they protect themselves from it? These web pages meet some people’s needs for summarized, up-to-date collection of information on coronavirus COVID-19 transmission routes and prevention methods.  The information describes ordinary situations of the general public, with not much on health care services and their high risks and intensive protections.  The explanations cite authors’ names in blue font, so you can click on those names and look at the original research articles, news, and recommendations.


Robert Vryheid, PhD, MPH

Division of Epidemiology and Biostatistics,
School of Public Health, San Diego State University, California, USA

If you have questions, please e-mail them to me at rvryheid@sdsu.edu .  I will search for answers, send them to you, and add them to the site.

Frequently asked questions

If someone coughs or breathes, how long can their viruses float in the air?

Can blood, feces, and or urine have the new Coronaviruses (SARS-CoV-2)?

Can eyes get infected or spread infection with the new Coronaviruses (SARS-CoV-2)?

Can masks really reduce the COVID-19 viruses going from person to person?

In which situations have a few people given COVID-19 to many other people?

Have pregnant women given COVID-19 to their babies?