PATHOLOGY

Detailed explanation-1: -A pathogen is defined as an organism causing disease to its host, with the severity of the disease symptoms referred to as virulence. Pathogens are taxonomically widely diverse and comprise viruses and bacteria as well as unicellular and multicellular eukaryotes.

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. Most bacteria are not pathogenic.

Detailed explanation-3: -Pathogens are microorganisms that have the potential to cause infectious diseases. Viruses, bacteria, protozoans and fungi are all potential pathogens.

Detailed explanation-4: -Bacillus anthracis (anthrax) Clostridium botulinum toxin (botulism) Yersinia pestis (plague) Variola major (smallpox) and other related pox viruses. Francisella tularensis (tularemia) Viral hemorrhagic fevers. Arenaviruses.