Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Coronavirus Measures Will Not End When Vaccine Arrives, Experts Say Steve Baragona The arrival of the first COVID-19 vaccine will not mean people can throw their masks away, experts say. Face coverings, social distancing and rigorous hand-washing still will be required for some time. How long depends on factors including how good the vaccines are and how long protection lasts -- questions that will not be answered when the first shots arrive. For starters, a vaccine may not be 100% effective. "This vaccine is not likely to be a suit of armor," said Vanderbilt University Medical Center infectious disease professor William Schaffner. [1]Seasonal influenza vaccines, for example, have ranged from 60% effective at best to 10% at worst in recent years. References 1. https://www.cdc.gov/flu/vaccines-work/past-seasons-estimates.html .