hand drawn virus seamless pattern in sketch style. microscope virus close up. . covid-2019

pattern seamless coronavirus papillomavirus herpes influenza hepatitis adenovirus covid pandemic epidemic virus hand drawn health protection sketch flu sick sickness disease autumn winter bacterium microscope cell bacteria microbe circle science fever infection life biology microbiology vector illustration black white symbol sign element ink pencil drawing engrave decor print wallpaper design style close up illustration covid-2019