human immunodeficiency virus. close-up of a hiv virion structure

hiv virus infection virion structure immunodeficiency closeup magnified particle acquired syndrome vector diagram science human aids disease medical viral microbe microbiology cell health microorganism infectious immunity icon biology retrovirus genome model immune compound antiviral receptor germs reverse transcriptase matrix envelope flat glycoprotein capsid provirus nucleocapsid protease budding evasion antiretroviral therapy