MCQ IN MEDICINE

Detailed explanation-1: -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.

Detailed explanation-2: -Viruses are tiny infectious agents that replicate only in the living cells of other organisms. Viruses have a very simple structure consisting of genetic material in the form of DNA or RNA? within a protein? capsule.

Detailed explanation-3: -What is a pathogen? 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.