My son and his wife adopted a 2 year old cat about 9 months ago. 6 months ago we brought our 1 year old cat to their house for a play date. They really didn’t interact much—my very gregarious cat acted shy. About a month ago his cat started having bloody diarrhea. After multiple vet visits she was diagnosed with intestinal cancer, had surgery and was put to sleep as it was advanced. Now comes the biopsy results—she had FIP. Should I worry? Should I have titers done?