Opportunistic pathogens

Opportunistic pathogens are pathogens which do not normally cause diseases in healthy host cell, but once the host reaches a level of weaken immune system where the pathogens can compromise, this weaken immunity will become an opportunity for these pathogens to infect the host cell.

Host cell => MCA
Compromised immunity => 老翁
Pathogenic microbes => ??? + ??? + ??? (Dunno...)

Does it really matter?
Not really. The only sad thing is to see this to happen, among ourselves....
Don't really care about the host cell with AIDS anymore,
another blow,
the host cell will be a goner...