Opinion of combo tests

Statistically we should not be testing at all, just using that money for more spay/neuters according to some presentations.  When testing HAS been done, what should be done with cats who test positive for leukemia.  Should we worry about positive heart worm tests?

Hello, and great question!

Alley Cat Allies actually recommends not testing (which you mention!).  Getting the cats spayed/neutered is certainly the most important thing you can do, since it may help inhibit the spread of the viruses in the first place.  Spaying/neutering will eliminate/reduce the primary modes of transmission - fighting and breeding - meaning even cats who are infected pose less risk to other cats.  The funds spent on testing often deplete the funds available for spaying/neutering additional cats, which is super important!

Also, it's not uncommon for cats to test a false positive for FIV and FeLV; this could be because they've already been vaccinated, or because they are very young.  If a cat does test positive, it's a really good idea to test the cat again in about a month.  And you're right - statistically speaking, the percentage of feral cats actually infected with either FIV or FeLV is low, and similar to the rate of infection in owned cats: 4.3% for FeLV, and 3.5% for FIV.

If a member of a feral cat colony is tested, and does test positive for FIV or FeLV, that alone doesn't necessitate the cat's removal from the colony.  Again, simply by having the cat spayed/neutered, the risk of transmission is greatly reduced.  A truly positive cat (remember, there can be false positives!) can still live for many years free of virus-related complications - even alongside virus-free cats!  The cats in the colony have already been living together, and it's probably ok that they continue living together.  Alley Cat Allies does not recommend euthanizing otherwise healthy cats simply because they test positive for FIV or FeLV - just return them to their colonies after being sterilized, vaccinated, and eartipped.  And, continue to monitor them and the other cats in the colony to make sure they're doing fine, and to take them to a vet if they need any care.

While it is possible that outdoor cats may acquire heart worms, there are preventatives that could be given if you are concerned that your cats are at a higher risk.  Actually administering the preventatives could be difficult, so definitely talk to your veterinarian about the pros and cons and overall benefits before deciding to pursue it!

-Amanda