Diphtheria is an acute, bacterial disease. There are different types of diphtheria that can affect the respiratory system and the skin. Bacillus anthracis is a rod-shaped, Gram-positive bacteria ...

If the peptidoglycan layer is thin, it's classified as gram negative. A gram-positive bacillus doesn't have an outer cell wall beyond the peptidoglycan membrane. This makes it more absorbent.