itching,allergies are caused by virus or bacteria
Infections caused by parasites and a few types of infections caused by bacteria may also need treatment with medications. Also, children with a severely weakened immune system are at risk for more serious disease. Symptoms may be more severe and could lead to serious illness.ome bacteria live in and on our bodies and do not cause problems. Other kinds of bacteria (as well as parasites and viruses) can make us quite ill if they invade our bodies. Bacteria and viruses can live outside of the human body (for instance, on a countertop) sometimes for many hours or days.