U.S. health officials have delayed a decision on whether to resume the use of Johnson & Johnson’s COVID-19 vaccine after reports of blood clots in six women who received doses. Dr. Monica Gandhi, an infectious disease physician and professor of medicine at the UCSF/San Francisco General Hospital, says it’s “prudent” to investigate reports of blood clots but notes the issue “is very rare” and unlikely to cause more than a temporary delay. She also says it’s important to raise “vaccine optimism” by continuing to tout the benefits of COVID-19 vaccines. “Eventually we are going to get back to the normalcy of not masking and distancing. We’re just in this twilight period right now because we are not fully vaccinated,” she says.