Tchalla MCQS Haemophilus influenzae .pdf

T’challa MCQs on Haemophilus influenzae 1. **Which serotype of Haemophilus influenzae is considered the most virulent?** A) Type a B) Type b C) Type c D) Type d 2. **What is the primary component of the capsule of H. influenzae type b?** A) Polysaccharide B) Polyribitol phosphate C)...

T’challa MCQs on Haemophilus influenzae 1. **Which serotype of Haemophilus influenzae is considered the most virulent?** A) Type a B) Type b C) Type c D) Type d 2. **What is the primary component of the capsule of H. influenzae type b?** A) Polysaccharide B) Polyribitol phosphate C) Lipopolysaccharide D) Protein 3. **What type of bacteria is Haemophilus influenzae?** A) Gram-positive cocci B) Gram-negative bacilli C) Gram-negative pleomorphic coccobacilli D) Gram-positive bacilli 4. **Which growth factor is essential for the growth of most Haemophilus species?** A) X-factor B) V-factor C) Both X-factor and V-factor D) None of the above 5. **What phenomenon allows Haemophilus species to grow on blood agar?** A) Satellite phenomenon B) Synergistic growth C) Autotrophic growth D) Anaerobic growth 6. **On which type of agar does H. influenzae grow?** A) Blood agar B) Chocolate agar C) MacConkey agar D) Nutrient agar 7. **What is the typical colony morphology of H. influenzae after 24 hours of incubation?** A) Large, dry colonies B) Small, smooth, opaque colonies C) Irregular, rough colonies D) Transparent colonies 8. **Which of the following tests is NOT used for the identification of H. influenzae?** A) Gram stain B) Sugar fermentation test C) Coagulase test D) X- and V-factor growth requirement test 9. **What type of anaerobe is H. influenzae classified as?** A) Obligate anaerobe B) Aerobic C) Facultative anaerobe D) Microaerophilic 10. **What is the optimal temperature for the growth of H. influenzae?** A) 25°C B) 30°C C) 35-37°C D) 40°C 11. **Which of the following methods can be used for the molecular identification of H. influenzae?** A) Mass spectrometry B) NAAT C) Sequencing D) All of the above 12. **What is the primary clinical significance of H. influenzae type b?** A) It causes skin infections. B) It is a common cause of pneumonia. C) It is associated with invasive diseases in children. D) It causes gastrointestinal infections. 13. **Which of the following is a characteristic of H. influenzae when viewed under a microscope?** A) Large, rod-shaped B) Small, pleomorphic coccobacilli C) Cocci in chains D) Spore-forming bacilli 14. **What type of agar is used to culture H. influenzae due to its growth factor requirements?** A) Blood agar B) Chocolate agar C) Sabouraud agar D) Cetrimide agar 15. **Which of the following tests is sufficient for the detection and identification of H. influenzae?** A) Gram stain B) X- and V-factor growth requirement test C) Biochemical tests D) Antigen tests 16. **What is the role of the capsule in H. influenzae type b?** A) It aids in nutrient absorption. B) It protects against phagocytosis. C) It facilitates adhesion to surfaces. D) It enhances motility. 17. **Which of the following is NOT a biotype of H. influenzae?** A) Biotype I B) Biotype II C) Biotype III D) Biotype VIII 18. **What is the primary method for diagnosing H. influenzae infections?** A) Serological tests B) Culture and sensitivity C) Gram stain and culture D) Clinical symptoms 19. **Which of the following is a common clinical manifestation of H. influenzae type b infection?** A) Meningitis B) Urinary tract infection C) Gastroenteritis D) Skin abscess 20. **What is the significance of the polyribitol phosphate capsule in H. influenzae type b?** A) It is a virulence factor. B) It is a nutrient source. C) It is a diagnostic marker. D) It is a metabolic byproduct. 21. **Which of the following is a characteristic of the colonies of H. influenzae on chocolate agar?** A) Rough and dry B) Smooth and opaque C) Transparent and large D) Irregular and small 22. **What is the primary reason H. influenzae does not grow on blood agar?** A) Lack of moisture B) Lack of X-factor C) Inhibition by other bacteria D) Inadequate temperature 23. **Which of the following tests can be used to detect the presence of H. influenzae type b antigens?** A) PCR B) Antigen tests C) Culture D) Biochemical tests 24. **What is the primary mode of transmission for H. influenzae type b?** A) Airborne droplets B) Fecal-oral route C) Direct contact D) Vector-borne 25. **Which of the following is a common laboratory method for identifying H. influenzae?** A) Blood culture B) Urine culture C) Sputum culture D) All of the above 26. **What is the significance of the pleomorphic nature of H. influenzae?** A) It allows for better survival in harsh environments. B) It complicates identification and diagnosis. C) It enhances its virulence. D) It aids in nutrient absorption. 27. **Which of the following is a potential complication of H. influenzae type b infection?** A) Otitis media B) Sinusitis C) Epiglottitis D) All of the above 28. **What is the primary treatment for infections caused by H. influenzae?** A) Antiviral medications B) Antibiotics C) Antifungal medications D) Supportive care only 29. **Which of the following is a characteristic of the growth of H. influenzae on chocolate agar?** A) Requires anaerobic conditions B) Grows in the presence of X-factor only C) Requires both X-factor and V-factor D) Grows at room temperature 30. **What is the role of NAAT in the diagnosis of H. influenzae?** A) It identifies the species based on morphology. B) It detects specific genetic material. C) It cultures the bacteria. D) It measures antibiotic susceptibility. --- ### Answers 1. B 2. B 3. C 4. C 5. A 6. B 7. B 8. C 9. C 10. C 11. D 12. C 13. B 14. B 15. B 16. B 17. C 18. C 19. A 20. A 21. B 22. B 23. B 24. A 25. D 26. B 27. D 28. B 29. C 30. B