1. The most common cause of community-acquired pneumonia is:
(A) Klebsiella pneumoniae
(B) Mycoplasma pneumoniae
(C) Streptococcus pneumoniae
(D) Legionella pneumophila
2. Which virus causes chickenpox?
(A) Measles virus
(B) Varicella-zoster virus
(C) Rubella virus
(D) Coxsackie virus
3. The causative agent of tuberculosis is:
(A) Mycobacterium leprae
(B) Mycobacterium tuberculosis
(C) Mycobacterium avium
(D) Mycobacterium kansasii
4. The BCG vaccine is given for prevention of:
(A) Leprosy
(B) Tuberculosis
(C) Typhoid
(D) Diphtheria
5. Which hepatitis virus is DNA-based?
(A) Hepatitis A
(B) Hepatitis B
(C) Hepatitis C
(D) Hepatitis E
6. Which hepatitis virus is transmitted through contaminated water?
(A) Hepatitis A and E
(B) Hepatitis B and C
(C) Hepatitis D
(D) All of the above
7. Koplik spots are pathognomonic of:
(A) Rubella
(B) Measles
(C) Mumps
(D) Chickenpox
8. The causative organism of diphtheria is:
(A) Corynebacterium diphtheriae
(B) Clostridium tetani
(C) Bordetella pertussis
(D) Haemophilus influenzae
9. The “whooping cough” is caused by:
(A) Bordetella pertussis
(B) Haemophilus influenzae
(C) Mycoplasma pneumoniae
(D) Streptococcus pyogenes
10. Which parasite causes malaria?
(A) Plasmodium species
(B) Toxoplasma gondii
(C) Trypanosoma
(D) Leishmania
11. The vector for malaria is:
(A) Aedes mosquito
(B) Anopheles mosquito
(C) Culex mosquito
(D) Sandfly
12. Blackwater fever is associated with:
(A) Plasmodium malariae
(B) Plasmodium vivax
(C) Plasmodium falciparum
(D) Plasmodium ovale
13. The causative agent of kala-azar is:
(A) Plasmodium vivax
(B) Leishmania donovani
(C) Trypanosoma cruzi
(D) Giardia lamblia
14. The vector for kala-azar is:
(A) Sandfly
(B) Tsetse fly
(C) Aedes mosquito
(D) Tick
15. Which protozoa causes sleeping sickness?
(A) Giardia
(B) Leishmania
(C) Trypanosoma brucei
(D) Plasmodium
16. Chagas disease is caused by:
(A) Trypanosoma cruzi
(B) Leishmania donovani
(C) Plasmodium falciparum
(D) Toxoplasma gondii
17. The causative agent of giardiasis is:
(A) Entamoeba histolytica
(B) Giardia lamblia
(C) Cryptosporidium
(D) Balantidium coli
18. The most common cause of traveler’s diarrhea is:
(A) Vibrio cholerae
(B) E. coli (ETEC)
(C) Salmonella typhi
(D) Shigella
19. The Widal test is used for diagnosis of:
(A) Tuberculosis
(B) Typhoid fever
(C) Leptospirosis
(D) Cholera
20. Rose spots are seen in:
(A) Typhoid fever
(B) Measles
(C) Rubella
(D) Malaria
21. The causative agent of cholera is:
(A) Vibrio cholerae
(B) E. coli
(C) Shigella
(D) Salmonella
22. Rice-water stools are seen in:
(A) Cholera
(B) Typhoid
(C) Dysentery
(D) Amebiasis
23. The vector of plague is:
(A) Rat flea
(B) Sandfly
(C) Tsetse fly
(D) Mosquito
24. The causative agent of plague is:
(A) Yersinia pestis
(B) Bacillus anthracis
(C) Brucella
(D) Salmonella
25. Weil’s disease is caused by:
(A) Leptospira interrogans
(B) Brucella
(C) Treponema pallidum
(D) Borrelia burgdorferi
26. The causative agent of syphilis is:
(A) Neisseria gonorrhoeae
(B) Treponema pallidum
(C) Haemophilus ducreyi
(D) Chlamydia trachomatis
27. The chancre of syphilis appears in:
(A) Primary stage
(B) Secondary stage
(C) Tertiary stage
(D) Latent stage
28. Hutchinson’s teeth are a feature of:
(A) Sickle cell anemia
(B) Congenital syphilis
(C) Rickets
(D) Lead poisoning
29. The causative agent of gonorrhea is:
(A) Neisseria meningitidis
(B) Neisseria gonorrhoeae
(C) Chlamydia trachomatis
(D) Haemophilus ducreyi
30. The causative agent of chancroid is:
(A) Treponema pallidum
(B) Chlamydia trachomatis
(C) Haemophilus ducreyi
(D) Klebsiella granulomatis
31. The causative agent of lymphogranuloma venereum (LGV) is:
(A) Haemophilus ducreyi
(B) Chlamydia trachomatis
(C) Neisseria gonorrhoeae
(D) Klebsiella granulomatis
32. Donovan bodies are seen in:
(A) LGV
(B) Granuloma inguinale
(C) Chancroid
(D) Syphilis
33. The vector of dengue is:
(A) Anopheles mosquito
(B) Aedes aegypti mosquito
(C) Culex mosquito
(D) Sandfly
34. Dengue fever is also known as:
(A) Breakbone fever
(B) Blackwater fever
(C) Relapsing fever
(D) Yellow fever
35. The causative agent of yellow fever is:
(A) Flavivirus
(B) Togavirus
(C) Paramyxovirus
(D) Reovirus
36. Which hemorrhagic fever is spread by Aedes mosquito?
(A) Yellow fever
(B) Dengue
(C) Zika virus
(D) All of the above
37. The causative agent of AIDS is:
(A) HTLV
(B) HIV (Retrovirus)
(C) EBV
(D) Hepatitis B virus
38. CD4 cells are primarily targeted in:
(A) Hepatitis B
(B) HIV infection
(C) Tuberculosis
(D) Measles
39. The most common opportunistic infection in HIV is:
(A) Pneumocystis jirovecii pneumonia
(B) Tuberculosis
(C) CMV infection
(D) Cryptococcus
40. Oral thrush in HIV is caused by:
(A) Candida albicans
(B) Cryptococcus
(C) Aspergillus
(D) Mucor
41. The causative agent of meningococcal meningitis is:
(A) Neisseria meningitidis
(B) Streptococcus pneumoniae
(C) Haemophilus influenzae
(D) Listeria monocytogenes
42. The causative agent of tetanus is:
(A) Clostridium perfringens
(B) Clostridium tetani
(C) Clostridium botulinum
(D) Clostridium difficile
43. The toxin of Clostridium botulinum causes:
(A) Spastic paralysis
(B) Flaccid paralysis
(C) Muscle rigidity
(D) Seizures
44. Gas gangrene is caused by:
(A) Clostridium tetani
(B) Clostridium perfringens
(C) Clostridium botulinum
(D) Clostridium difficile
45. Which organism causes pseudomembranous colitis?
(A) Salmonella
(B) Shigella
(C) Clostridium difficile
(D) Vibrio cholerae
46. The causative agent of Lyme disease is:
(A) Treponema pallidum
(B) Borrelia burgdorferi
(C) Leptospira
(D) Rickettsia
47. Erythema migrans is seen in:
(A) Syphilis
(B) Lyme disease
(C) Measles
(D) Dengue
48. Rocky Mountain spotted fever is caused by:
(A) Rickettsia rickettsii
(B) Rickettsia prowazekii
(C) Borrelia
(D) Coxiella burnetii
49. Q fever is caused by:
(A) Coxiella burnetii
(B) Rickettsia typhi
(C) Brucella
(D) Bartonella
50. Cat scratch disease is caused by:
(A) Bartonella henselae
(B) Pasteurella multocida
(C) Brucella
(D) Francisella tularensis