PATHOLOGY

Detailed explanation-1: -There are different types of pathogens, but we’re going to focus on the four most common types: viruses, bacteria, fungi, and parasites.

Detailed explanation-2: -Infectious diseases are caused by pathogens, which include bacteria, fungi, protozoa, worms, viruses, and even infectious proteins called prions. Pathogens of all classes must have mechanisms for entering their host and for evading immediate destruction by the host immune system.