Question

notes on infectious agent of communicable diseases in 100words only

Answer 1

Communicable diseases are those that are transmissible from one person, or animal, to another. The disease may be spread directly, via another species (vector) or via the environment. Illness will arise when the infectious agent invades the host, or sometimes as a result of toxins produced by bacteria in food.The organisms that cause disease vary in size from viruses, which are too small to be seen by a light microscope to intestinal worms which may be over a metre long. The groups of infectious agents are listed with examples of diseases they cause. Bacteria Pneumonia, tuberculosis, enteric fever, gonorrhoea Viruses Measles, varicella, influenza, colds, rabies Fungi Ringworm, tinea pedis (athlete’s foot) Protozoa Malaria, giardia Metazoa Tapeworm, filariasis, onchcerciasis (river blindness), hookworm