Trap Neuter Return (TNR)is the best way to control feral cat populations.
When the management of a local apartment complex in my home town informed residents that they had employed a pest control company “to remove the cats”, many of the residents felt that this was inappropriate, so they contacted local cat enthusiasts for their support in finding an alternative answer. Listen to this podcast to find out more about what happened. Click on the play button to hear it.
Feral cat populations do need to be controlled, but just “removing them” doesn’t work
Please note that I am unable to answer veterinary questions in comments. If you have questions or concerns about your pet's health it is always better to contact your vet.