Question

1.

Which of the following is the best diagnosis based on the symptoms?

		Polio
		Diphtheria
		Pertussis
		Rheumatic fever

2.

Which of the following correct describes the causative agent Corynebacterium diphtheriae?

		gram negative endospore-forming bacilli
		gram negative non-endospore-forming bacilli
		gram positive cocci
		gram positive pleomorphic bacteria

Answer 1

And) 1) Diphtheria

Explaination:

- Doctors usually decide if a person has diphtheria by looking for common signs and symptoms. They can use a swab from the back of the throat and test it for the bacteria that cause diphtheria. A doctor can also take a sample from a skin lesion (like a sore) and try and grow the bacteria.

2) gram positive pleomorphic bacteria

Explaination:

- Corynebacterium diphtheriae is a Gram-positive nonmotile, club-shaped bacillus. Strains growing in tissue, or older cultures in vitro, contain thin spots in their cell walls that allow decolorization during the Gram stain and result in a Gram-variable reaction.

- To accurately identify C. diphtheriae, a Gram stain is performed to show Gram-positive, highly pleomorphic organisms with no particular arrangement.