Your kitties may have Calicivirus. It is quite contagious between cats.
Feline calicivirus infection is a common respiratory disease in cats. The virus attacks the respiratory tract -- lungs and nasal passages -- the mouth, with ulceration of the tongue, the intestines, and the musculoskeletal system. It is highly communicable in unvaccinated cats, and is commonly seen in multicat facilities, shelters, and breeding catteries.
Since it's viral it does not respond to antibiotics so we treat it with lysine and supportive care.
Add 500 mg of l-lysine to the community water.
It is imperative to prevent dehydration.
Drain the water from a can of tuna into a dish and let them lap it up.
Their mouths may be painful so feed odorous canned food or baby food with no onion power They can also have tuna or salmon.Warm the food to make it easier to smell
If they are congested run a hot shower and make a steam room in your bathroom ..take them in for ten minute intervals.
Please let me know how they are doing.
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