How can I tell if my child is allerigic to cats?

Is anyone kid here allergic to cats? How did you find out? My 5-month-old had RSV & it’s been over a month… Still wheezing, sneezing, red/swollen cheeks, still congested. His pediatrician said the RSV should’ve run it’s a course by now & he shouldn’t be this irritated still.. I told her about my cats & she thinks it’s the cats. Which if I have to re-home them to help him, I will, without a doubt, I’m just curious if anyone here has had a child this young show early signs of being allergic to cats/animals? Anonymous Community MemberThis question was asked by a Facebook community member who has asked to remain anonymous.