الدكتور/ مصطفى عراقى - Dr.Mostafa Eraqi

أستاذ مساعد الميكروبيولوجى والمناعة بكلية العلوم

اسئلة فى البكتيريا

1. Mantoux test detects

               a. M. tuberculosis                                                     b. Cyanobacteria

               c. Clostridia                                                              d. Both a and b

2. Salmonella typhi is causative organism of

               a. Undulant fever                                                     b. Remittent fever

               c. Dengue fever                                                       d. Enteric fever

3. In enteric fever, the organ lodging maximum number of the organism is

               a. Liver                                                                    b. Gall bladder

               c. Small intestine                                                     d. Large intestine

4. Gastroenteritis is caused by

               a. Shigella                                                                 b. V.cholerae

               c. V.cholera Parahaenolyticus                                 d. S.typhi

5. E.coli produces the following toxins:

               a. Enterotoxins                                                         b. Endotoxins

               c. Verocytotoxins                                                     d. Hemolysins

6. Diphtheria is an example of

               a. Bacteraemia                                                          b. Pyaemia

               c. Septicemia                                                            d. Toxaemia

7. BCG vaccine is for the prevention of

                  a. Brucellosis                                                            b. Diphtheria

                  c. Botulism                                                               d. Tuberculosis

8. Bacilli Calmette Guerin (BCG) contains the a virulent strains of

                   a. Human tubercle bacilli                                       b. Avian tubercle bacilli

                   c. Bovine tubercle bacilli                                       d. A typical mycobacteria

9. Streptococcus pyogens produces all of the following lesions, except

                   a. Impetigo contagiosa                                          b. Erysipeals

                   c. Boil                                                                   d. Paronchia

10. Causative agent of Scarlet fever:

                   a. Staphylococcus aureus                                     b. Streptococcus viridans

                   c. Stre. Pyogens                                                   d. None of these

11. Rheumatic fever is most commonly caused by

                   a. Str. viridans                                                      b. Str. faecalis

                   c. Stph. aures                                                        d. None of these

12. The following characters are true about Neisseria gonorrhoeae except

                     a. Gram-negative, aerobic bacteria                      b. Non-motile diplococci

                      c. Oxidase positive organisms                           d. Air borne infection

13. dysenteric and watery stool must reach laboratory within

          a- 15 minutes                                                    b- 30 minutes

          c- 90 minutes                                                     d- 50 minutes

14. young child when it is not possible to obtain sputum we do----

a- gastric wash                                                                   b- mouth swab

c- eye biopsy                                                                      d- stool sample

15. Causes of presence of pus in stool found when:

a- there is inflammation of the intestinal           b- patients with bacillary dysentery

c- patients with intestinal schistosomiasis        d- a & b

16. patient with streptococcal sore throat, the tonsils may be covered with----

a- red spots                                                        b- green spots

c- white spots                                                    d- yellow spots

17. culture techniques used to:

a- isolate bacteria b- distraction of bacteria

c- staining of bacteria                                                d- non of the above

18. A 72 year-old man admitted over the last 3 months in a surgical ward presents with repeated infection of the ambulatory wound in the right leg. Treatment with various broad spectrum antimicrobial agents did not resolve the infections. Pus culture from the wound swab showed glucose non-fermentative colonies on MacConkey agar. Biochemical characterization showed oxidase positive. Based on the data available, which of the following etiologic agent do you think poses threat to this man’s health?

a. Escherichia coli                                                              b. Klebsiella pneumoniae

c. Pseudomonas aeruginosa                                             d. Neisseria gonorrhoeae

19. A 5 year old boy is seen in the paediatric respiratory clinic for regular review of his cystic fibrosis. He has a productive cough and a specimen is forwarded to the laboratory. Select the culture medium which would be most appropriate to isolate Haemophilus influenzae from this patient.

a.  Blood agar                                  b. Chocolate bacitracin agar                   d.  MacConkey agar

d.  Methicillin mannitol salt agar                                                                       e.  XLD agar

20. A 6-year-old girl is brought into the office for evaluation of a sore throat and fever, which she has had for approximately 4 days. Her parents have immigrated to the United States from KSA about 6 months ago. She has not had much medical care in her life, and her immunization status is unknown. On examination the child is anxious, tachypneic, and ill appearing. Her temperature is 38.6°C and her voice is hoarse. Examination of her pharynx reveals tonsillar and pharyngeal edema with the presence of a gray membrane coating of the tonsil, which extends over the soft palate. She has prominent cervical adenopathy. Her lungs are clear. which of the following etiologic agent.

          a. Streptococcus pyogenes b. Streptococcus pneumonia

          c. Staphylococcus aureus d. Corynebacterium  diphtheria

Question (2):

The questions should be answered either by selecting True (T) or False (F) for each answer statement, or by selecting the answer statements which best answer the question.

1. Which of the following antibiotics are used to treat tuberculosis?

a. Benzylpenicillin.(  )                  b. Isoniazid. (   )                c. Rifampicin. (   )

           d. Pyrazinamide.(   )                     e. Vancomycin.(    )

2. A young army recruit presents at a sexually transmitted disease (STD) clinic with acute urethritis. A Gram stain of his urethral exudate reveals neutrophils with intracellular gram-negative diplococci. He is treated with ceftriaxone and sent home. He is requested to return in 1 week so that a urethral culture can be obtained to confirm antibiotic cure. Which ONE of the following culture media should be used for the follow-up culture?

      a. Blood agar.(    )                       b. Chocolate agar.(    )          c. MacConkey agar.(     )

      d. Modified Thayer-Martin agar. (     )                                     e. Mannitol-salt agar.(   )

3. A 22-year-old sexually active female from New England presents with fever and right knee swelling. Her joint aspirate reveals gram-negative diplococci. She also has had a recent bout of cervicitis. What is the most likely cause of this patient’s septic arthritis?

     a. Staphylococcus aureus. (     ) b. Streptococcus pyogenes. (       )

c. Neisseria gonorrhoeae.(      ) d. Pseudomonas aeruginosa. (        )

e. Borrelia burgdorferi (        )

4. Which of the following are true of the clinical presentation of disease caused by Salmonella Typhi?

     a. Disease is usually restricted to the gastrointestinal tract.  (      )

     b. A rash may be a presenting feature. (      )

     c. Gastrointestinal perforation is a complication. (     )

     d. The carrier state is unknown. (     )

 And Which of the following is useful in the diagnosis of Salmonella?

      a. Gram stain. (      )                                         b. Culture of bone marrow.  (       )

      c. Serology. (       )                                           d. PCR.  (     )

5. A young woman recently underwent rhinoplasty to correct a deviated septum and her nose was packed postoperatively. She experienced a 2–3-day period of low-grade fever, muscle aches, chills, and malaise. This was followed by the development of a sunburnlike rash that covered most of her body. The packing was removed and a nasal swab grew gram-positive cocci that were catalase-positive and produced colonies on mannitol-salt agar that were surrounded by a yellow halo. The bacteria clumped when mixed with rabbit plasma. What is your diagnosis?

       a. Scalded skin syndrome. (     )           b. Toxic shock syndrome. (      )

      c. Carbunculosis.  (     )                         d. Erysipelas. (     )                e. Impetigo. (     )

6. Which of the following laboratory tests are important in the diagnosis of GAS disease?

      a. Microscopy. (     )                               b. Culture. (     )                     c. Serology.(     )

      d. Antigen detection.  (      )                    e. All of the above (A–D) are important. (    )

7. All of the following may result from infection with GAS, EXCEPT?

a. Acute pharyngitis.  (      ) b. Pyoderma.  (     ) c. Necrotizing fasciitis. (      )

d. Meningitis. (      ) es. Cellulitis. (      )

8. Which of the following is true of E. coli?

a. It is a significant cause of urinary tract infections. (        )

b. It is part of the normal flora of the intestine. (     )       c. It lacks endotoxin in the cell wall. (    )

d. It is a significant cause of colitis. (     ) e. It is gram-positive. (     )


جامعة المجمعة

Medical laboratories Department

الساعات المكتبية


من الاحد الى الخميس : 10 الى 12


أرقام الاتصال

جوال: المملكة العربية السعودية:   00966565709849
جمهورية مصر العربية:               00201005111249
هاتف المكتب  :                         0096664044088
تحويلة داخلية:                            4088

البريد الالكترونى: m.eraqi@mu.edu.sa

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