covid-19 virus under the microscope. medical of a red coronovirus. china`s agent for respiratory flu virus quid vira

2019ncov abstract background bacteria biochemical biology bird blood cell china corona coronavirus covid covid19 death diagnosis disease epidemic epidemiology flu global health hiv human illness illustration infect infection macro medical medicine microbe microbiology microorganism microscopic pandemic pathogen quarantine red retrovirus science scientific vaccine viral virology virus warning who wuhan