[header] How to diagnose and treat feline toxoplasmosis [title] Check for signs of a fever. [step] Fever is a common symptom of toxoplasmosis. Touch your cat's nose to see if it is wet and damp or dry and warm. 
If it is dry and warm, then your cat may have a fever. Additionally, if you notice your cat lying down more than usual with irritated or heavy eyes, then your cat may be lethargic due to a fever.