attention warning covid-19 biological hazard sign, novel coronavirus 2019-ncov , novel corona virus 2019-ncov outbreak with black

disease control pathogen medical covid covid19 usa wuhan corornavirus hazard sticker respiratory contagion stop coronavirus merscov infection careful global virus world sars china flu epidemic outbreak pneumonia chinese pandemic protection concept bacteria risk quarantine information 2019ncov detected attention biohazard vaccine contamination mers infected corona prohibition area zone novel breathing ncov fever danger warning dangerous icon safety medicine biology vector illustration caution