He has a history of atrial fibrillation, hyperlipidemia, acid reflux and seasonal allergies. Under the seasonal allergies category his doctor wrote “This patient has dealt with seasonal allergies and sinus congestion for most of his life.” This means he is only allergic to 1 or all types of seasonal pollen, notably trees, grasses and weeds. The summary does not state he has perennial allergens which would be dust mites, cat dander, dog dander or mold. As a Senator from Delaware, if he was allergic to trees, the peak season would be spring. For grass pollen it would be summer and for weeds it would be early fall. His report did not state if he’s allergic to all 3 major seasonal allergens or just some of them.
https://allergylosangeles.com/allergy-blog/joe-bidens-allergies/