Hi welcome to H.C.M.Forum. sore throat
and flu have no relation with chemical or any sort of abortion
. flu or fever
with cold is either due to viral infection or allergy
. sore throat is secondary to it. when it is due to allergy, it goes on repeating till the allergen like cold weather, cool drinks , sea foods, ect. so be away from allergens, and be happy. salt water gargling will give temperory relief.thank you.