coronavirus seamless pattern. covid-19 virus backgrounds, wallapapers in blue, green and red colors. flu virus texture

2019ncov abstract background bacteria bacterium banner biohazard blue china color concept corona coronavirus covid19 dangerous design disease epidemic fever flu global green health illustration infection influenza medical medicine microbe microbiology microscopic outbreak pandemic pathogen pattern pneumonia prevention quarantine red science seamless set symbol texture vaccine vector virus wallpaper warning wuhan