Vaccines conquered smallpox and polio, but COVID-19 looks like a tougher battle ...Middle East

US Navy hospitals like this one in San Diego, California, were among the first to receive the COVID-19 vaccine back in December. In the past the military has helped to get large swathes of the population immunized quickly. (Mass Communication Specialist 2nd Class Erwin Jacob V. Miciano/US Navy/)During the early days of the Revolutionary War, George Washington’s Continental Army retreated from Quebec after half of his 10,000 soldiers contracted smallpox. Afterwards, Washington did everything he could to prevent smallpox from spreading among the ranks—including infecting soldiers with live virus from pustules to give them a milder form of disease and build up immunity. This mass inoculation wa

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