Biology · 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 biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Which of the following disease is communicable and 100% fatal if not controlled immediately?

  1. Coronary heart attack

  2. Atherosclerosis

  3. Rabies

  4. Typhoid

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

Rabies is a deadly disease caused by a virus that attacks the central nervous system (brain and spinal cord). Infected mammals can transmit rabies virus to humans and other mammals. Rabies is almost always fatal once symptoms appear. People usually get exposed to the rabies virus when an infected animal bites them. Exposure may also occur if saliva from a rabid animal enters an open cut or mucous membrane (eyes, nose or mouth).

Therefore, the correct answer is option C.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

The disease known as hydrophobia is

  1. Rabies

  2. Tetanus

  3. Syphills

  4. Cholera

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

Rabies is a viral disease that causes acute inflammation of the brain. Rabies is caused by lyssaviruses including: rabies virus and Australian bat lyssavirus. Rabies is spread when an infected animal scratches or bites another animal or human. Hydrophobia (fear of water) is the historic name for rabies. It refers to a set of symptoms in the later stages of the infection in which the person has difficulty swallowing, shows panic when presented with liquids to drink, and cannot quench his or her thirst. Any mammals infected with the virus may demonstrate hydrophobia. 

Therefore, the correct answer is option A.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Rabies is spread by infected animals to other warm-blooded animals including people through saliva (e.g. biting or licking).

  1. True

  2. False

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

The rabies virus is transmitted to others through the saliva of the infected animal. All mammals can carry the virus. Humans can contract the virus through a bite from the infected animal, or from a scratch, scrape, open wound, or mucous membrane that comes in contact with the saliva. It is not possible to contract the virus by petting a rabid animal or through contact with the blood, urine, or feces of a rabid animal.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Rabies is caused by

  1. Bacteria

  2. Fungi

  3. Virus

  4. Protozoa

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

Rabies infection is caused by the rabies virus. Domestic dogs, cats, and rabbits, and wild animals, such as skunks, raccoons, and bats, are able to transfer the virus to humans via bites and scratches. The virus causes the inflammation of the brain in humans and mammals. it affects the central nervous system.

Therefore, the correct answer is option C.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Rabies specific signs is/are

  1. Hydrophobia

  2. Hydrophillia

  3. Fever

  4. Airophilia

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

Rabies is a life-threatening condition that causes tens of thousands of deaths worldwide every year. It’s caused by a virus that attacks the central nervous system. The virus is transmitted to humans via bites and scratches from infected animals. The symptoms of rabies can present themselves just a few days after a bite, or they might take as long as 12 weeks. The common symptoms includes fever, headache, nausea and fear of water due to difficulty in swallowing (hydrophobia), insomnia etc. 

Therefore, the correct answer is option A.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Rabies mainly affects

  1. Central nervous system

  2. Respiratory system

  3. Circulatory system

  4. All of the above

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

Rabies is a life-threatening condition that causes tens of thousands of deaths worldwide every year. It’s caused by a virus that attacks the central nervous system. The virus is transmitted to humans via bites and scratches from infected animals. The symptoms of rabies can present themselves just a few days after a bite, or they might take as long as 12 weeks. The common symptoms includes fever, headache, nausea and fear of water due to difficulty in swallowing, insomnia etc. 

Therefore, the correct answer is option A.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Rabies/Hydrophobia is caused by a

  1. Fungus

  2. Virus

  3. Bacterium

  4. Protozoan

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

Rabies or hydrophobia is a viral disease that causes inflammation of the brain in humans and other mammals. Early symptoms include fever and tingling at the site of exposure. The other symptoms include violent movements, uncontrolled excitement, fear of water, an inability to move parts of the body, confusion, and loss of consciousness. Hence, rabies is caused by the rabies virus.

So, the correct answer is 'Virus'.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

A communicable disease, which if not controlled immediately is 100% fatal is ________.

  1. Syphilis

  2. Kala-azar

  3. Filariasis

  4. Hydrophobia

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

Hydrophobia, also known as rabies is a viral disease that causes inflammation of the brain in humans and other mammals. Early symptoms can include fever and tingling at the site of exposure. Rabies virus is typically transmitted to humans by the bite of an infected mammal, often a carnivore or a bat. If rabies is untreated properly, 100% fatality rate is associated with infection. 

So, the correct answer is 'Hydrophobia'.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Zoonotic disease transmitted to humans is 

  1. Measles

  2. Diphtheria

  3. Trachoma

  4. Rabies

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

Zoonotic disease refers to an infectious disease, and it can be passed directly or indirectly between species such as from vertebrate animals to humans. It is transmitted to humans is rabies, and humans acquire this disease from animals (dogs, cats and monkeys). The disease (rabies)-causing agent is a virus.

So, the correct answer is 'Rabies'.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Which of the following statements about rabies in people is false?

  1. Rabies virus targets the brain and spinal cord

  2. Rabies is almost always fatal once symptoms appear

  3. Rabies symptoms will almost always appear within a few days

  4. Rabies can lead to organ failure, coma and death

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

Explanation: In humans it may take from as early as two weeks to as late as one year after exposure for symptoms to appear.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Rabies is caused by

  1. Bacteria and it affects the nervous system

  2. Virus and it affects the cardiovascular system

  3. Virus and it affects the nervous system

  4. Bacteria and it affects the cardiovascular system

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

Rabies is a viral disease that causes inflammation of the brain in humans and other mammals. Early symptoms can include fever and tingling at the site of exposure. These symptoms are followed by one or more of the following symptoms: violent movements, uncontrolled excitement, fear of water, an inability to move parts of the body, confusion, and loss of consciousness. Once symptoms appear, the result is nearly always death. The time period between contracting the disease and the start of symptoms is usually one to three months, but can vary from less than one week to more than one year. The time depends on the distance the virus must travel along peripheral nerves to reach the central nervous system.

So the correct option is 'virus and it affects the nervous system'.

Multiple choice biology animals in daily life introduction to reproduction poultry farming food from animals

Which of the following is the most infective type of bird flu? 

  1. H5N1

  2. H7N9

  3. H1N1

  4. None of the above

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
H5N1 is the most infective type of influenza virus that infects geese, turkey, chicken and ducks. They can also spread to farm poultry through the wild birds. They rarely infect humans. In case of human infection the disease is fatal. 
So, the correct answer is 'H5N1'
Multiple choice chemistry medicinal chemistry antacids and antihistamines therapeutic action of different classes of drugs ph regulation of the stomach

Antiseptics and disinfectants either kill or prevent growth of microorganisms. Which of the following statements is not true?

  1. Chlorine and Iodine are used as strong disinfectants

  2. Dilute solutions of Boric acid and Hydrogen Peroxide are strong antiseptics

  3. Disinfectants harm the living tissues

  4. A 0.2% solution of phenol is an antiseptic while 1% solution acts as a disinfectant

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

Antiseptic and disinfectants both either kill or prevent the growth of microorganisms. The main point of difference between these two is that the former (antiseptic) are used for living beings whereas disinfectants are not safe for living tissues.

A substance like phenol in its lower concentration (0.2%) behaves as antiseptic whereas in higher concentration (1%) as a disinfectant. 
Chlorine and iodine are strong disinfectants whereas dilute solutions of boric acid and hydrogen peroxide are mild antiseptic.