Final answer:
Most cats infected with feline Calicivirus experience mild respiratory illness and recover with supportive care, though some cases can become complicated by secondary bacterial infections.
Step-by-step explanation:
The typical outcome for most cats infected with feline Calicivirus is a relatively mild upper respiratory illness that includes symptoms such as sneezing, nasal discharge, conjunctivitis, and sometimes ulcers on the tongue, hard palate, tip of the nose, lips, or around claws. While many cats recover with supportive care, such as cleaning nasal and eye discharge and ensuring good nutrition, some cat populations (like those in shelters) might experience more severe outbreaks. In the case of uncomplicated infections, the illness typically resolves on its own, but in multi-cat environments or in cats with other health issues, secondary bacterial infections can complicate the clinical picture, requiring antibiotic treatment.