Disease agents include bacteria (causing such maladies as typhoid fever and cholera), protozoa (resulting in diseases like amoebic dysentery), viruses (causing polio, infectious hepatitis, and so forth), parasites (causing malaria, and so forth), and fungi (responsible for problems like athlete’s foot).
Hän jäi pois bussista ja käveli tien ylijw2019 jw2019