Applied science level 3 y

Infections are invasions of microorganisms in the body, causing harm to a person's health in the body. The invasion of aninfection causes the growth of germs in your body. The infection can start anywhere in the body and can spread to any place aswell. Infectious diseases are caused by organisms such as viruses, fungi, bacteria and parasites. These organisms enter the bodyand live off of the host, making a person sick and very ill.