Nocardiosis is a rare bacterial infection that attacks the lungs, ... Nocardiosis is an opportunistic infection, ... If the disease spreads to the brain, death rates jump to more than 80%.

Both are classified as Opportunistic Infections (OIs), meaning that they are more common and more severe in people with weak immune systems. Guerrero's family announced his death on Instagram on ...

Both are classified as Opportunistic Infections, meaning they are more common and more severe in people with weak immune systems. Guerrero's family announced his death on Instagram on Feb. 23.