Some viruses, like the common cold, are a flash in the pan. They infect us, our bodies fight back — which is what makes us sick — and then they’re gone, until the next variant rolls along.
Other viruses linger.
Once HIV gains a foothold in a person’s body it never leaves, except for the few individuals who’ve been cured by bone marrow transplant; people with HIV must continually take antiretroviral drugs to stay healthy and not develop AIDS.
