Biology · Science General

Disease Causative Agents

2,531 Questions

Disease causative agents questions test your understanding of viral, bacterial, and fungal infections, along with their transmission methods. These are common topics in general science sections of SSC and railways exams. Practice these questions to accurately identify disease pathogens and symptoms.

Viral diseasesFoodborne illnessesDisease transmission methodsExtrinsic disease factorsCommon pathogens

Disease Causative Agents Questions

Multiple choice

The pyrogenic streptococcal exotoxins SPE, A, B, and C ____________.

  1. are M proteins

  2. cause post-streptococcal autoimmune disease

  3. produce high titers of anti-streptolysin O

  4. have hyaluronidase activity

  5. are superantigens
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The superantigens combine with the framework regions of certain TCR V beta families irrespective of their complementarity determining regions.

Multiple choice

Which one of the following diseases has been completely eradicated world-wide?

  1. Measles

  2. Smallpox

  3. Tuberculosis

  4. Cowpox

  5. Psittacosis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The eradication of smallpox was due to an enormous World Health Organization (WHO)-sponsored effort combining extensive vaccination and selective epidemiologic control methods. The WHO also hopes to eradicate poliomyelitis in the near future.

Multiple choice

Which of the following diseases are caused by Gram-negative bacteria? P. Typhoid Q. Cholera R. Plague S. Gonorrhoea

  1. Only P and Q

  2. Only P and S

  3. Only Q and R

  4. Only Q, R and S

  5. All of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Yes, it is the correct answer as all of the given diseases are caused by gram-negative bacteria. The causative agent of typhoid is Salmonella typhi (Gram-negative bacteria). Cholera is caused by Vibrio cholerae (Gram-negative bacteria). Plague is caused by Yersinia pestis (Gram-negative bacteria). Gonorrhoea is caused by Neisseria gonorrhoeae (Gram-negative bacteria).

Multiple choice

Which of the following is a pair of bacterial diseases?

  1. Malaria and Pneumonia

  2. Meningitis and Pneumonia

  3. Malaria and Meningitis

  4. Clonorchiasis and Tetanus

  5. Malaria and Clonorchiasis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Causative agent of meningitis is Neisseria meningitidus (Bacteria). Causative agent of pneumonia is Diplococcus pneumoniae (Bacteria).

Multiple choice

Which of the following viral diseases are caused by members of family Paramyxoviridae? P. Mumps Q. Measles R. Rubella S. Smallpox

  1. Only P and Q

  2. Only P and R

  3. Only P and S

  4. Only Q and R

  5. Only R and S
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mumps is caused by mumps virus, a member of the genus Rubulavirus in the family Paramyxoviridae. Measles (rubeola) is a skin disease with respiratory spread caused by Morbillivirus, a member of family Paramyxoviridae.

Multiple choice

Which among the following is a waterborne disease?

  1. Brain fever

  2. Poliomyelitis

  3. Malaria

  4. Pneumonia

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Poliomyelitis is a viral disease that can be transmitted through contaminated water or food. Malaria is vector-borne (mosquitoes), while pneumonia and brain fever have different primary transmission routes.

Multiple choice

Gumma is a lesion associated with:

  1. Lymphogranuloma

  2. Arthritis

  3. Syphilis

  4. Chancroid

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A gumma is a soft, non-cancerous growth that is a characteristic lesion of the tertiary stage of syphilis.

Multiple choice

Haemophilus ducreyi causes:

  1. Pneumonia

  2. Dysentery

  3. Cholera

  4. Chancroid

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Haemophilus ducreyi is the bacterium responsible for causing chancroid, a sexually transmitted disease characterized by painful genital ulcers.

Multiple choice

West Nile fever is a ______disease.

  1. Mosquito-borne

  2. Air-borne

  3. Water-borne

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

West Nile fever is a viral infection primarily transmitted to humans through the bite of infected mosquitoes. It is not spread through air or water.