Corynebacterium

Question 1

Corynebacterium is

Answer 1

Gram-positive bacilli

Question 2

Corynebacterium characterized by ..

Answer 2

large divers group of bacteria also it’s Gram-positive rods slightly curved and wider ends however it’s Non-motile, non-sporing, non-capsulated. More than 60 species in the genus
The genus includes animal and human pathogens as well as saprophytes
and plant pathogens Some Corynebacteria are part of normal flora of humans (skin and nares),
they are non-pathogenic, called “diphtheroidsʺ

Question 3

What is most important pathogen in the group

the causative agent of diphtheria

Answer 3

Corynebacterium diphtheriae

Question 4

Corynebacterium diphtheriae is

Answer 4

Gram positive rods slightly curved and wider ends

Catalase positive Non-motile, Non-capsulated and non-spore forming. Aerobic and facultative anaerobic

Question 5

The bacteria Corynebacterium diphtheriae
group together in a characteristic way, which has been
described as the form of

Answer 5

ʺV”, ʺangular” or ʺ Chinese letters”

Question 6

There are four biotypes of C. diphtheriae, namelly

Answer 6

C. diphtheriae gravis C. diphtheriae intermedius C. diphtheriae mitis C. diphtheriae belfanti

Question 7

pseudomembrane cause by ..

Answer 7

Corynebacterium diphtheriae

Question 8

Type of specimens from?

Answer 8

Throat swab (from pseudomembrane)

Question 9

Culture should be.?

Answer 9

Inoculate specimen on: • Tellurite blood agar(TBA) – Tellurite inhabit other bacteria
• Tinsdale agar (TIN) (should contain blood or serum)