Hello, may I ask you what blood test can help me to know if my son has viral or bacterial bronchitis? My son has mostly dry hacking cough for 5 days and fever between 101-102 F . (His younger brother had the same for 2 weeks (June 1 -14) little soar throat,no strep, cough, I went to urgent care and they gave him antibiotics and within two days his cough got better and no fever. His sister had fever ,cough sinceJune 10, I took her to urgent care along with brother and because she had a little ear infection,she got antibiotics too. And within 2 days she got better too. I hope I did not confuse you.I just wanted to give you more info. I do not know if the antibiotics helped his siblings or it was coincident that they both felt better after 2 days.) Thank you,Gabriela