Infectious diseases can kill people worldwide than any other cause. These diseases are caused by germs. Germs are tiny living things which are found everywhere - in air, soil and water. You can catch infection by touching, drinking, eating or breathing something where germs prevail. Germs can also spread through animal and insect bites, kissing and sexual contact. Preventive measures which help in protecting from these infections are Vaccines, proper hand wash and medicines. Different types of germs are Bacteria, Viruses, Fungi, Protozoa.