Travel, especially to developing countries, can increase your risk of getting opportunistic infections.
Some species may cause a range of opportunistic infections in humans.
Symptoms to watch for that may mean an opportunistic infection is developing.
"Just because you've had an opportunistic infection, that doesn't mean you should be thrown away."
"I mean, what was the opportunistic infection that revealed it?"
But the volunteers did not show such a drop and none developed opportunistic infections.
Most of these conditions are opportunistic infections that can be easily treated in healthy people.
Treatment for opportunistic infections depends on the type of infection and the original disease.
Youngsters in particular, he said, "are just sitting ducks for any opportunistic infection."
"For the moment, the best advice is to treat opportunistic infections," she said on Thursday.