viral attack in the cellular environment.

pink art red toy purple textile crochet orange fun concept education microscopic flu cell viral attack cellular environment sars pandemic risk pathogen respiratory coronavirus 2019-ncov outbreak virus microbecorona covid-19 quarantine infection biohazard ncov alert china contagious disease human influenza antibiotics asian bacteria chinese coronavirinae coronaviruse corona viruses diagnosis epidemic epidemiology fever health illness immunity infect lethal lung medical medicine microbiology new strain pathogenic pneumonia prevention science syndrome virology warning pollen allergy model funny humor cheerful joke simulation symbol knowledge