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.

Detailed explanation-2: -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-3: -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-4: -Typhoid fever It is caused by pathogenic bacterium Salmonella typhi.

Detailed explanation-5: -Pseudomonas aeruginosa-can cause pneumonia and blood infections. Mycobacterium tuberculosis-causes tuberculosis. Listeria-causes foodborne infections and flu-like symptoms. Salmonella-causes typhoid. E. coli-causes intestinal infections with symptoms like fever and diarrhea.