HIV aids can be spread through unprotected sex, drug use ( sharing dirty needles) and sometimes through blood transfusions but not as often as the first to. so protect your self and don't and don't do drugs.
a thick mist is a person
Fog.
Mist.
mist
If you're referring to the Stephen King movie, The Mist, then: there are no plagues. The creatures are from another dimension.
Another word for mist would be fog. You could also say dew or cloud.
A stranger can come out from a mist by gradually becoming visible as they walk towards you or as the mist clears. It can create a mysterious and intriguing effect as the person slowly emerges from the haze.
Mist
Scientist opened a portal to another dimension where the creatures inhabited and started coming through the portal with the mist
Cloud, steam, vaper, or mist.
North Myrtle
Mist or fog are two possibilities.