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

Which of the following viral diseases are caused by RNA viruses?

  1. Measles
  2. Mumps
  3. Chickenpox
  4. Smallpox

  1. 1 and 2

  2. 1 and 3

  3. 1 and 4

  4. 2 and 3

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

This is the correct answer. Measles (also known as rubeola) is caused by the measles virus, a single-stranded, negative-sense, enveloped RNA virus of the genus Morbillivirus within the family Paramyxoviridae. Mumps virus is a single-stranded, negative-sense, enveloped RNA virus and a member of the Paramyxovirus family.

Multiple choice

Directions: Which one is the correct option:

Kalaazar disease is caused by

  1. Bacteria

  2. Virus

  3. Protozoan

  4. Fungus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Kala-azar, also known as visceral leishmaniasis, is caused by the protozoan parasite Leishmania donovani. It is transmitted through the bite of infected female sandflies (Phlebotomus species). The disease affects internal organs like spleen, liver, and bone marrow, and can be fatal if untreated.

Multiple choice

Pelvic inflammatory disease or pelvic inflammatory disorder (PID) is an infection of the upper part of the female reproductive system namely the uterus, fallopian tubes and ovaries and inside of the pelvis. Which of the following pairs of organisms is involved in most of the cases of PID?

  1. Candida albicans and Mycobacterium fortuitum

  2. Peptostreptococcus asaccharolyticus and Peptostreptococcus anaerobius

  3. Gardnerella vaginalis and Atopobium vaginae

  4. Chlamydia trachomatis and Neisseria gonorrhoeae
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chlamydia trachomatis and Neisseria gonorrhoeae are usually the main cause of PID. They are associated with most PIDs.

Multiple choice

Coltiviruses are associated with Colorado tick fever. Which of the following symmetries is present in the structure of these viruses?

  1. Enveloped icosahedral symmetry

  2. Helical symmetry

  3. Complex symmetry

  4. Non-enveloped icosahedral symmetry
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Non-enveloped icosahedral symmetry is present in the structure of this virus. It is generally spherical in shape and has two concentric capsid shells surrounding a core of about 50 nanometers in diameter.

Multiple choice

Hyalomma is a genus of hard-bodied ticks common in Asia, Africa and Europe. Bite of this tick has been attributed previously to the outbreaks of which of the following diseases?

  1. Venezuelan hemorrhagic fever

  2. Argentine hemorrhagic fever

  3. Korean hemorrhagic fever

  4. Crimean–Congo hemorrhagic fever
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Outbreaks of Crimean–Congo hemorrhagic fever are usually attributable to Hyalomma tick bites or contact with infected animals or people.

Multiple choice

Which of the following statements relating to infective conjunctivitis is FALSE?

  1. Lymphoid follicles may form in the conjunctiva during an infection.

  2. Giant tarsal papillae can also result from bacterial infection of the eye.

  3. The commonest cause of conjunctivitis worldwide is Chlamydia trachomatis.

  4. The commonest viral cause of conjunctivitis in adults in Europe is cytomegalovirus.

  5. Allergy is also regarded as one of the causes of infective conjunctivitis.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Adenovirus is the commonest cause of conjunctivitis in Europe, with herpes simplex virus a close second.