Bacteria such as Streptococcus and Haemophilus influenzae are responsible for

Pneumonia is caused by bacteria such as Streptococcus pneumoniae and Haemophilus influenzae, which infect the alveoli (air-filled sacs) of the lungs. The infection causes the alveoli to swell with fluid, causing serious breathing difficulties. Fever, chills, cough and headache are all signs of pneumonia.

The bacterium Yersinia pestis causes plague, an infectious disease.

Entamoeba histolytica is the protozoan parasite that causes amoebic dysentery or amoebiasis.

Diphtheria is a dangerous bacterial infection caused by Corynebacterium diphtheriae strains.