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COVID-19 Information: Santa Clara County and Bay Area, California

Trustworthy information about COVID-19

Trustworthy COVID-19 and Coronavirus Information

The purpose of this guide is to collect information on the novel coronavirus and COVID-19 that is:

  • accurate (to the best of our knowledge),
  • up to date, and
  • verified

so that people in our communities (Santa Clara County, California) and throughout the U.S. can make their best choices for their own health and the health of their families and neighbors during this crisis.

Our medical librarian staff sort through the news sources, social media, hearsay, and hype so you don't have to. The links included here are factual to the best of our knowledge, and updated frequently (sometimes daily!). Look for the New! icon  to locate recent updates.

Current Infection Rates in the Bay Area

County, state, and federal health authorities track many different data points - the number of positive tests, of hospitalizations, of deaths, etc. -to figure out how COVID-19 is trending through our communities. Infection rate is tracked quite closely, This is an estimated number, based on positive tests and hospitalizations as well as on what we know so far about how this disease behaves.It is often expressed in terms of a 7-day average, calculated each day ("rolling").

Here are those numbers for the Bay Area counties for the last couple of weeks:


COVID-19 infection rate in the Bay Area counties in the previous weeks, 7-day rolling average per 100,000 people

    County                 as of Nov. 12   as of Nov. 18     as of Nov. 25

   Santa Clara        




   San Mateo




   San Francisco   








   Contra Costa








   Santa Cruz












National & International Updates

The U.S. National Library of Medicine has created a hub for relevant scientific / medical research articles. It is divided into sections for general information, mechanism [of infection and disease], transmission, diagnosis, treatment, prevention, case reports, and forecasting).


​Be sure to discuss information gathered from these resources with your health care providers to see if it is relevant to your individual situation. Health and medical information accessed through these websites is not intended to substitute for or to replace the advice or instruction of a health care professional. 

About PlaneTree Health Library

PlaneTree Health Library's mission is to guide the public to trustworthy, accurate, and free health and medical information. In operation since 1989, it is a free, public, patient and consumer health library and 501(c)3 nonprofit organization. It does not accept advertisements; it has no commercial relationship with the sources of information on these webpages. Visit our online information guides linked from our main website at:

The text on this page is copyright PlaneTree Health Library, licensed under Creative Commons CC BY-SA. Linked contents are the responsibility of their creators / copyright holders.