close-up view of a coronavirus particle with spiky surface. hmpv, human metapneumovirus

hmpv metapneumovirus coronavirus particle spiky surface closeup virus microorganism disease infection pandemic covid health biology science microscopic pathogen contagious research blue medicine human particles microscopy healthcare viral structure viruses anatomy epidemic prevention molecule viruscenter viruscell cells sickness bronchitis organism spiked up macro protein virology spherical bacterium illness fever ai generated