In our continuing series looking at the latest medical research and news on COVID-19, we speak with UCSF’s Dr. Peter Chin-Hong. 

Today’s topics include: 

• C.D.C. will not investigate mild infections in vaccinated Americans 

• CDC chief tells vaccinated Americans to enjoy their Memorial Day holiday 

• Current approach to preventing COVID-19 at the Olympics is "dangerous," US expert says

• COVID-19 testing’s value shrinks as vaccines beat back virus  

• There's a free treatment for COVID-19; why aren't more people using it? 

• Just how big could India’s true COVID-19 toll be? 

• How the Wuhan lab-leak theory suddenly became credible 

• Vaccinations for LAUSD students— what to know 

• Coronavirus rates plummet but Memorial Day will be a test for LA 

• With most seniors vaccinated in L.A. County, a higher proportion of younger adults are hospitalized with COVID 

Guest:

Peter Chin-Hong, M.D., infectious disease specialist and professor of medicine at the UCSF Medical Center; he tweets @PCH_SF