Thank you Islandborn for the kind words

^^ What Purple Banana said

Just to add something on HIV/AIDS - I doubt that it would mutate to an airborne variant (thankfully!).

The thing to realise in the differences between HIV and for example Influenza/Flu is that influenza is a respiratory virus, it's droplet spread and it invades the cells lining the air ways - nose, trachea and sinuses while HIV does not target those.

It would take fundamental "redesign" of the virus for that to happen - HIV targets immune cells in the linings of the membranes and although it could target these cells in the nasal passages too - BUT they are far fewer in number than the regular cells which line the airways - also the amount of virus needed to lead to infection is quite large.

You would just about drown from the amount of fluid entering the airways before getting HIV this way. The virus also does not occur in secreations from the respiratory tract so you can't sneeze out HIV, it is secreated into saliva but you need a large amount to transmit it via kissing (having wounds in the mouth or inflammation reduces this amount). Someone with a high viral load (the amount of virus in your body) could maybe spit on a fresh would and possibly transmit HIV that way but that hasn't been documented yet.

HIV doesn't have any insect vector transmission as the inoculum is too small and conditions in vectors like a mosquito are HIV unfriendly. HIV can't survive for more than a few minutes outside the human body.

So it wouldn't be impossible but very very unlikely.