More than 100 potential vaccines are being developed, including several in clinical trials, but experts have underscored the difficulties of finding vaccines that are effective against coronaviruses.
A medical professional conducts tests for the coronavirus disease (COVID-19) in Bolinas, a coastal enclave in Northern California where all residents are being tested for the novel coronavirus and its antibodies on Monday, one of the first such efforts since the pandemic hit the United States three (photo credit: KATE MUNSCH/REUTERS)ByREUTERS
