Cats actually do not become infected with HIV (Human Immunodeficiency Virus); they have their own related virus called FIV (Feline Immunodeficiency Virus). Your cat cannot infect you with FIV, so you are not at risk for any disease.
The short answer is, you will end up with a full house of FIV-positive cats - the virus is fairly contagious among cats that are commingled. However, if you keep all the cats indoors and don't bring new cats in, the cats you have can live a relatively normal life. Once your last FIV-positive cat passes away, you should thoroughly clean your house before bringing in any new cats to ensure the virus is gone.
Healthy? If it has FIP it is going to die within a few weeks. If it is carrying the virus that mutates into FIP, no big deal, most cats have already had the virus. While the virus is contageous, if the other cat has been in a house with five or fewer cats for at least three months, the virus is gone. It is not generally recommended that they be comingled. Certainly, though, it's fine to have the FIP cat in one room or one section of the house, and your non-infected cats in another section. This website has some good Q and A about FIP: http://www.vet.cornell.edu/fhc/brochures/fip.html Also: http://en.wikipedia.org/wiki/Feline_infectious_peritonitis
There are relatively few cases of dogs and cats becoming infected with WNV.
Yes, many cats are house cats. You can count all adopted cats as house cats, since they belong to households.
Cats are aggressive when you get to close to their babies.
yes wild cats are as fastidious as house cats
The infected mushrooms!
dogs and cats gett tapeworms from the infected flea they have consumed or have been bitten from
Practice being good house cats, doing the landry, housework and minding the little house cats.
I think there are more house cats. -Annabelle
House cats are found in africa.
By eating infected food.
The cat will most likely be in and get infected.