The consequences of flea infestation will be terribly uncomfortable for most affected cats and can be the source of deadly disease for some. (www2.vet.cornell.edu)
No other medical development has been as successful as vaccination in controlling deadly diseases in companion animals. (cattime.com)
The answer is not to stop administering vaccinations since that would potentially allow for outbreaks of infectious diseases in cats and can be a public health concern for deadly diseases like rabies. (sagecenters.com)