One particular critical element was a scientific being familiar with with regard to the virus alone. Virologists had come to believe that variola could survive and replicate only inside human beings. Many viruses that cause ailment in individuals may also infect animals — consider Jenner’s cowpox. But variola had shed https://lifewebdirectory.com/listings12681163/little-known-facts-about-culture-of-the-united-states