human metapneumovirus hmpv

metapneumovirus microbiology presentation invertebrate antibiotics coronavirus advertising background pathogenic protection screenshot wildflower diagnosis infection influenza undefined christmas emerging epidemic medicine outbreak pandemic pathogen sickness lighting darkness sunlight concept covid19 disease illness medical microbe science vaccine diagram signage produce blossom pattern corona corvid crisis danger global health infect strain circle number branch autumn nature design orange purple poster china fever human round virus world wuhan brand label petal cartoon person organ