The COVID-19 virus was first identified as a new virus in December 2020. SARS-CoV-2, the virus that causes COVID-19, is a single-stranded RNA coronavirus with spikes on the surface. As a highly infectious...

As of 2000, the Centers for Disease Control and Prevention had declared measles eliminated, but a measles outbreak in 2018 would devastate the country once again. As of April 29, 2019, the number of measles...