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: Reflection: one year since the coronavirus gripped the world Could easing restrictions add fuel to coronavirus variants? Study: Pfizer first dose provides less protection for cancer patients Denmark pauses AstraZeneca vaccine use over blood clot concerns EU regulator recommends J&J vaccine approval Vaccines in the works to target multiple variants Study: UK variant has higher death rate Long hauler symptoms may not be unique to COVID-19 Is it safe for vaccinated people to hook up? Guest: Peter Chin-Hong, M.D., infectious disease specialist and professor of medicine at the UCSF Medical Center; he tweets @PCH_SF