Alternative Second Opinion based on extensive research: you can not catch or transmit a virus or flu by airborne means contrary to conventional medicine.
More likely, you have a bacterial, fungus, parasite, poisonous or toxic substance infection that keeps reappearing because you are treating it with vaccine when it should be treated with something else. Your body is a detoxifying mechanism not an immune system. It is signaling you that it is trying to get rid of something that is toxic. Suggest you consult a naturopathic or homeopathic doctor (who is licensed) who can identify the toxemia and then recommend how to treat it.
To suggest such a thing is contrary to reality.
No