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. US Health Experts: Coronavirus Vaccines on the Way, but Precautions Still Paramount Ken Bredemeier WASHINGTON - Two top U.S. coronavirus experts assured Americans Sunday that vaccines against the pandemic would soon become available but warned that not taking precautions against the spread of the virus before then could prove disastrous. "We should have enough vaccine by the end of the year to immunize 20 million Americans and we have to immunize for impact," Admiral Brett Giroir, the White House virus testing chief, told CNN. "But the American people have to do the right things until we get that vaccine widely distributed." .