Medical Microbiology: Chlamydia trachomatis and related micorganism MCQ

Multiple Choice Question with answers on Chlamydia trachomatis & other Chlamydiaceae

1) Which of the following Chlamydia spp are human pathogens? Select from all the options given below
a) Chlamydia pecorum
b) Chlamydia psittaci
c) Chlamydia trachomatis
d) Chlamydia pnuemoniae

2) What serotypes of Chlamydia trachomatis is associated with inclusion conjunctivitis seen in adults and neonates?
a) Serotypes D to K
b) Serotypes L1,2 and 3
c) Serotypes A, B, and C
d) Serotypes A, B, B and C

3) What type of laboratory methods are used for the diagnosis of genital Chlamydia trachomatis infections? Select all that applies
a) Specimen culture in McCoy cell tissue culture
b) Direct fluorescent antibody and Enzyme-linked immunoassay
c) Serological tests
d) Nucleic acid amplification test


4) Chlamydia trachomatis is transmitted from infected mother to baby through the birth canal and can cause neonatal inclusion conjunctivitis, how many days after the baby is born symptoms in eyes start to develop?
a) After 24 hours
b) Within 48 hours
c) After 6 hours
d) Within 7 to 15 days

5) All of the following statements are true about the antigens of Chlamydia spp, Except?
a) Genus-specific antigens are common to all Chlamydia
b) Only Chlamydia trachomatis have genus-specific antigens
c) Species-specific antigens are present in the outer membrane of Chlamydia spp
d) None of the above

6) Which of the following statements is NOT the distinguishing features of the family Chlamydiaceae?
a) They are seen on Gram stain
b) They are obligate intracellular bacteria
c) They cannot make ATP
d) They consist of two forms elementary and reticulate body

7) All of the statements given below are correct about Chlamydia psittaci, EXCEPT?
a) It is a primary pathogen of birds
b) It can cause respiratory infections in human
c) It is usually resistant to sulfonamides
d) It only infects birds like parrots and cockatoos

8) What is the most sensitive laboratory diagnostic tests for Chlamydia pneumoniae?
a) Giemsa staining test
b) Microimmunofluorescence test
c) Cell culture method
d) None of the above

9) Human is the only reservoir of Chlamydophila pneumoniae, the pathogen is most prevalent in which age group of people?
a) 2 to 5 years
b) 10 to 30 years
c) 5 to 18 years
d) 20 to 45 years


10) Name the organism given below which is frequently associated with urethritis apart from Chlamydia trachomatis?
a) Klebsiella pneumoniae
b) E. Coli
c) Streptococcus agalactiae
d) Neisseria gonorrohoea

11) All of the statements given below are correct about pathogenic Chlamydophila pneumoniae, EXCEPT?
a) It causes respiratory infections which is most common in young children
b) The bacteria spread from person to person via a respiratory route
c) It produces intracytoplasmic inclusions that lack glycogen
d) The infections caused by the bacteria are usually asymptomatic

12) When do the symptoms of neonatal pneumoniae in babies start to show caused by Chlamydia trachomatis?
a) In 1 week after the birth
b) In 2 to 12 weeks after birth
c) In 5 to 10 days after the birth
d) In 2 to 3 weeks after the birth

Multiple Choice Answers Review
1- Option b, c, and d are correct
2-a) Serotypes D to K
3-Option a, b, c & d
4- d) Within 7 to 15 days
5-b) Only Chlamydia trachomatis have specific antigens
6-a) They are seen on Gram stain
7-d) It only infects birds like parrots and cockatoos
8-b) Microimmunoflourescence test
9-c) 5 to 18 years
10-c) Neisseria gonorrohoea
11-a) It causes respiratory infections which is most common in young children
12-b) In 2 to 12 weeks after birth

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