Biology ยท Science General

Disease Causative Agents

2,258 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

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.

Multiple choice

Cystitis refers to:

  1. Brain infection

  2. Lung infection

  3. Bladder infection

  4. Gastrointestinal infection

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

Cystitis is the medical term for inflammation of the bladder, typically caused by a bacterial infection.

Multiple choice

Which of the following is mismatched?

  1. Syphilis-Treponema pallidum

  2. Fireblight of apples-Erwinia amylovora

  3. Citrus canker-Phytomonas citri

  4. Plague-Clostridium tetani
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plague is caused by the bacterium Yersinia pestis, not Clostridium tetani (which causes tetanus).

Multiple choice

The skin is the largest organ of the body, with a total area of about 20 square feet. Which of the following statements relating to infections in the skin is true?

  1. Skin granulomas are rare in Mycobacterium leprae infections.

  2. Human papilloma virus (HPV) is associated with a reactive, non-infective skin rash.

  3. The measles rash is infective.

  4. Recurrent herpes labialis is caused by reactivation of persistent herpes simplex infection often provoked by exposure to UV light.

  5. Atopic individuals have an increased tendency to varicella zoster virus (VZV).
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Reactivation of the persistent HSV infection is probably due to suppression of the skin immune system.

Multiple choice

Recurrent or severe bacterial pneumonia does NOT usually complicate, which of the following conditions?

  1. Complement C3 deficiency

  2. Primary antibody deficiencies

  3. Secondary immunodeficiency

  4. Splenectomy

  5. Immunosuppression following renal transplantation
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The anti T cell immunosuppression used to prevent graft rejection increases the risk of fungal and viral infections. Bacterial pneumonia is a particular risk when the patient is neutropenic after bone marrow transplantation.

Multiple choice

Meningitis is a disease affecting the

  1. brain and the spinal cord

  2. liver and the spleen

  3. pancreas

  4. eyes and the ears
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Meningitis is an inflammation of the protective membranes covering the brain and spinal cord, known as the meninges.

Multiple choice

Which of the following diseases is/are caused by RNA virus?

  1. Influenza
  2. Chickenpox
  3. Rubella
  4. Rabies

  1. Only 1 and 2

  2. Only 1, 2 and 3

  3. Only 1, 3 and 4

  4. Only 2, 3 and 4

  5. Only 2 and 4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is correct. Influenza is an infectious disease of birds and mammals caused by RNA viruses of the family Orthomyxoviridae. Rubella is caused by is caused by Rubella virus, a togavirus that is enveloped and has a single-stranded RNA genome. Rabies is caused by rhabdovirus (RNA virus).