About this site

How do people transmit coronavirus COVID-19 to each other, and how can they protect themselves from it?  These web pages provide summarized, up-to-date information on:

  • coronavirus COVID-19 transmission routes in ordinary situations of the general public.
  • prevention methods they can use to protect themselves.

It has less on:

  • health care services, their high transmission risks, and intensive protections.
  • Demographic disparities in which kinds of people have been getting infected or seriously ill.
  • Mutating variant coronaviruses.

It does not have information on:

  • Medical treatments and vaccines.   Other review articles cover those topics well (Mann et al.).

The explanations cite authors’ names in red font, so you can click on those names and look at the linked 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?