This question requires matching diseases with the type of organism that causes them. - Malaria is caused by parasites of the genus Plasmodium, which are protozoans. - Poliomyelitis (Polio) is caused by the poliovirus, which is a virus. - Tuberculosis (TB) is caused by the bacterium Mycobacterium tuberculosis. - Ringworm is a fungal infection of the skin or scalp, caused by various species of fungi (dermatophytes).