different type of bacteria
2. Some of the harmful types of bacteria are those which can cause disease or adversely affect one's health, and these include: Mycobacteria, which are rod-shaped, and neither Gram-positive nor Gram-negative microorganisms that can cause infections of the lungs, skin and other parts of the body.
Coccus. Cocci are round, spherical-shaped bacteria. They can occur as a single bacterium or be arranged in a pair, chain or cluster of bacteria depending on which type of coccus it is. These bacteria cause many different types of common diseases.