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Diseases and immunity - class-VIII

Description: diseases and immunity
Number of Questions: 40
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Tags: health and diseases biology living world and classification of microbes diseases and immunity
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Which of the following disease is 100% fatal and mode of transmission is through infected animals?

  1. AIDS

  2. Rabies

  3. Tetanus

  4. Hepatitis-B


Correct Option: B
Explanation:

AIDS is transmitted sexually or through blood transfusion or from mother to fetus.
Tetanus is not transmitted from person to person or from animal to person.
Hepatitis-B is transmitted through blood and infected bodily fluids.
Rabies is a fatal viral disease of mammals, most often transmitted through the bite of a rabid animal.
Therefore, the correct answer is option b.

Which one of the following is an example of zoonosis disease?

  1. Measles

  2. Diptheria

  3. Leprosy

  4. Rabies


Correct Option: D
Explanation:

A zoonotic disease is a disease that is transmitted from animals to humans. They can be caused by viruses, bacteria, parasites and fungi. Measles is a viral disease in humans. Diptheria is caused by bacterium Corynebacterium diptheriae. Leprosy is chronic infection caused by bacteria Mycobacterium leprae.
Rabies is one such zoonotic disease caused by the rabies virus of the genus Lyssavirus.
Thus, the correct answer is option (D), 'Rabies'.

Which of the following group is called pathogens?

  1. Viruses, bacteria and fungi

  2. Measles, mumps and chicken pox

  3. Cholesterol, saturate fat, and helminthes

  4. All of the above


Correct Option: A
Explanation:

The organisms or agents which are responsible for the development of a disease or any infection is known as a pathogen. The ability of the organism to cause disease is pathogenicity. The microbes like the virsues, bacteria, and fungi are known as the pathogens which cause a certain type of infection. 

Thus, the correct answer is option A. 

Which of the following is water borne disease?

  1. Malaria

  2. Cholera

  3. Tuberculosis

  4. Both A and B


Correct Option: B
Explanation:

Cholera is caused by the bacterium Vibrio cholerae. This bacteria is usually found in food or water contaminated by feces of an infected person. This is most likely to happen when sewage water mixes with a source of drinking water. Drinking water after boiling helps to prevent this infection. Thus the correct answer is option B.

Which of the following causes infectious diseases?

  1. Pollutants

  2. Harmful lifestyle

  3. Inheritance

  4. Microorganisms


Correct Option: D
Explanation:

Pollutants are the harmful oxides or chemicals which degrade the quality of the environment and causes pollution. 

Harmful lifestyle affects the metabolic process of the body and leading to severe diseases and also causes ageing.
Inheritance is the transfer of characters from the parents to offsprings. 
Microorganisms are the small microorganism which are not visible to naked eye and carries the pathogens responsible for infectious disease.
So, the correct answer is option D.

Assertion: Rabies is acute infectious disease of warm blooded mammals characterized by involvement of central nervous system resulting in paralysis and finally death.

Reason: This is caused due to neurotropic filterable bacteria in saliva of rabid animals.

  1. If both the assertion and the reason are true and the reason is the correct explanation of the assertion

  2. If both the assertion and the reason are true and the reason is not the correct explanation of the assertion

  3. If the assertion is true and the reason is false

  4. If both the assertion and the reason is false

  5. If the assertion is false but the reason is true


Correct Option: C
Explanation:

Rabies is an overwhelming encephalomyelitis and includes severe headache and high fever with excitement and depression. This disease occurs by a virus called Rhabdovirus.

Which common disease is also known as hydrobhobia?

  1. Rabies

  2. Dengue

  3. Typhoid

  4. Influenza


Correct Option: A
Explanation:

Rabies is a viral infection that mainly spreads through a bite from an infected animal. It is an RNA virus of the rhabdovirus family.Once inside the nervous system, the virus produces acute inflammatiom of the brain. Coma and death soon follows. Encephelitus Rabies:This occurs in 80% of human cases. The person is more likely to experience hyperactivity and "hydrophobia".

So, the correct option is A. ( Rabies )

A disease spread directly by animal bites is 

  1. Syphilis

  2. Scarlet Fever

  3. Rabies

  4. Malaria


Correct Option: C
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. Other symptoms include violent movements, uncontrolled excitement, fear of water, an inability to move parts of the body, confusion, and loss of consciousness. Rabies virus is typically transmitted to humans by the bite of an infected mammal, often a carnivore or a bat.

So, the correct answer is 'Rabies'.

The animals that are reservoirs of rabies are:

  1. wolf

  2. jackal

  3. bat

  4. all the above


Correct Option: D
Explanation:

In the United States, several distinct rabies virus variants have been identified in terrestrial mammals, including raccoons, skunks, wolfs, foxes, and coyotes. In addition to these terrestrial reservoirs, several species of insectivorous bats are also reservoirs for rabies.

So the correct option is D.

__________ is  a viral disease.

  1. Typhoid

  2. Leprosy

  3. Rabies

  4. Ringworm


Correct Option: C
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.

Introduction of vaccine by injection is called _________.

  1. Inoculation

  2. Vaccination

  3. A & B

  4. None of the above


Correct Option: A

Which of the following pathogens causes whooping cough?

  1. Legionella spp.

  2. Bordetella pertussis

  3. Vibrio cholerae

  4. Brucella melitensis


Correct Option: A

Which of the following diseases is spread by animal bite?

  1. Pneumonia

  2. Tuberculosis

  3. Cholera

  4. Rabies


Correct Option: D
Explanation:

Rabies is an acute viral disease of the central nervous system that affects all warm-blooded animals and is usually transmitted to humans by a bite from an infected dog.

Disease which affects central nervous system is

  1. Polio

  2. Jaundice

  3. Rabies

  4. Both A and C


Correct Option: D
Explanation:
Rabies is a viral disease that is spread most often from the bite of a rabid animal to another animal or to a human. The rabies virus affects the central nervous system including the brain and spinal cord of humans and animals. During the incubation period, the time between exposure to the virus and the appearance of symptoms, the virus travels along nerves towards the brain. This process takes an average of one to three months, but can range from several days to several years after exposure. The infection causes inflammation of the brain and spinal cord that can lead to encephalopathy and later, death.

Hydrophobia is related to

  1. Rabies

  2. Hepatitis

  3. Yellow fever

  4. Tetanus


Correct Option: A
Explanation:

Rabies causes hydrophobia in the encephalitic stage which means when it affects the brain and causes swelling and inflammation of multiple areas of the brain. Hence, it affects the complex swallowing areas in the brain. Initially into the course of the disease, the patient has involuntary contractions of neck muscles when he drinks water. At later stages of disease, the patient starts contracting his muscles even at the thought of water. Rabies virus is a neurotropic virus which means that it travels through nerves because of its preference to attach to acetylcholine receptors in the neurons. 

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

  1. Coronary heart attack

  2. Atherosclerosis

  3. Rabies

  4. Typhoid


Correct Option: C
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.

Treatment of rabies was discovered by

  1. Lord Lister

  2. Ronald Ross

  3. Louis Pasteur

  4. Edward Jenner


Correct Option: C
Explanation:

Louis Pasteur was the first person who uses the live virus in vaccination and developed the method for the attenuation of virulent microorganisms that is the basis of vaccination. He developed vaccines against cholera, anthrax and rabies. Thus, the correct answer is option C.

Vaccine against rabies was first developed by

  1. Edward Jenner

  2. Paul Ehrlich

  3. Louis Pasteur

  4. Alexander Fleming


Correct Option: C
Explanation:

Louis Pasteur and Emile Roux developed the first rabies vaccination in 1885. This vaccine was first used on a human on July 6, 1885, on nine-year-old Joseph Meister, who had been bitten by a rabid dog.

Therefore, the correct answer is option C.

The disease known as hydrophobia is

  1. Rabies

  2. Tetanus

  3. Syphills

  4. Cholera


Correct Option: A
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.

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

  1. True

  2. False


Correct Option: A
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.

In which animal is rabies more likely to be found?

  1. Stray dogs

  2. Bat

  3. Raccoon

  4. All of the above


Correct Option: D
Explanation:

Most rabies cases are found in domestic animals, such as the dog or cat. But with the rabies vaccine now required for pets and livestock, most rabies animal cases today are found in wild animals and stray dogs. It is found most often in raccoons, skunks, bats, foxes, and coyotes. Rarely it is found in rabbits, squirrels, rats, and opossums, although it is becoming more common in groundhogs. Raccoons are a concern because they often interact with household pets.

So, the correct answer is 'All of the above'.

Main transmitter/ host of rabies

  1. Cats

  2. Owls

  3. Dogs

  4. Rats


Correct Option: C
Explanation:

Rabies infection is caused by the rabies virus. Rabies is a life-threatening condition that causes tens of thousands of deaths worldwide every year. Dogs are the most common source of transmitting the virus along with cats and wild animals like raccoons and bats. They are able to transfer the virus to humans via bites and scratches. 

Therefore, the correct answer is option C.

Rabies is caused by

  1. Bacteria

  2. Fungi

  3. Virus

  4. Protozoa


Correct Option: C
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.

Which of the following is not a preventive measure for rabies?

  1. Vaccination programmes

  2. Immunization

  3. Immunoglobulin treatment

  4. None of the above


Correct Option: D
Explanation:

Animal control and vaccination programs have decreased the risk of rabies from dogs in a number of regions of the world. Immunizing people before they are exposed is recommended for those who are at high risk. Immunoglobulins are effective in preventing the disease if the person receives the treatment before the start of rabies symptoms.

Rabies specific signs is/are

  1. Hydrophobia

  2. Hydrophillia

  3. Fever

  4. Airophilia


Correct Option: A
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.

Rabies mainly affects

  1. Central nervous system

  2. Respiratory system

  3. Circulatory system

  4. All of the above


Correct Option: A
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.

If you get bitten or scratched by an animal you should

  1. Call or visit your doctor or nearest urgent care clinic

  2. Clean the wound thoroughly with soap and water

  3. Notify your local Public Health Unit

  4. All of the above


Correct Option: D
Explanation:

If you are on a hike and don't have soap with you, use water alone, but wash with soap as soon as you can. If you wake up to find a bat in your room or in your child's room, call your health care provider even if you don't think you've been bitten or scratched by the bat. Bats have small teeth that leave marks that aren't easy to spot, and you could have been bitten while sleeping without being aware of it. Even if you are bitten by an animal not likely to carry the rabies virus, you should still call your health care provider.

So, the correct answer is 'All of the above'.

How soon after a potentially infectious bite should a person be treated for rabies?

  1. Within 6 hours

  2. Within 24 hours

  3. Within a week

  4. Within 2 weeks


Correct Option: B

Who initially developed the vaccine for rabies in man?

  1. Robert Koch

  2. Joseph Lister

  3. Louis Pasteur

  4. Stanley


Correct Option: C
Explanation:

Rabies is a disease which is caused when the infected animal bites the human. Rabies is a disease which is caused by the rabies virus. The vaccine for the treatment of the rabies was first developed by Louis Pasteur and Roux. This vaccine was developed in the year 1885 and was injected into a kid who was infected with rabies due to the dog bite.

Thus, the correct answer is 'Louis Pasteur'.

Rabies/Hydrophobia is caused by a

  1. Fungus

  2. Virus

  3. Bacterium

  4. Protozoan


Correct Option: B
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'.

The reservoir of rabies is 

  1. Rabid dogs

  2. Foxes,wolves and rabid dogs

  3. Dogs,foxes,wolves,jackals ,mongooses,bats,cats,skunks and coyotes

  4. Rabid ,dogs and cats.


Correct Option: C

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

  1. Syphilis

  2. Kala-azar

  3. Filariasis

  4. Hydrophobia


Correct Option: D
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'.

In India, the non-rabies zone is

  1. Goa

  2. Lakshadweep

  3. Tamil Nadu

  4. Kashmir


Correct Option: B
Explanation:

Rabies is a major public health problem in India. The disease occurs in all parts of the country except Lakshadweep islands because of lack of dogs (vector of rabies virus) in that particular region. About 7-10 thousand cases are reported every year. About 30,000 persons contract rabies and die; more than 2 million people are exposed to animals every year and about 1 million are administered anti-rabies vaccines.

Anti-rabies vaccine was discovered by

  1. Edward Jenner

  2. James Lind

  3. Louis Pasteur

  4. Robert Koch


Correct Option: C
Explanation:

Vaccines are the suspension of the live or killed microorganism which mainly activates the immune response. Louis Pasteur produced the first vaccine for rabies by growing the virus in rabbits. Pasteur was the first scientist to artificially attenuate viruses for use in vaccines. He created several veterinary vaccines before his development of the rabies vaccine in 1885 for use in humans. So, the correct answer is option C.

Zoonotic disease transmitted to humans is 

  1. Measles

  2. Diphtheria

  3. Trachoma

  4. Rabies


Correct Option: D
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'.

Which of the following animals cannot carry the rabies virus?

  1. Skunk

  2. Cow

  3. Deer

  4. Crow


Correct Option: D
Explanation:

Explanation: Any warm-blooded animals, domestic or wild, can carry rabies. Other animals such as birds, reptiles, amphibians, or fish neither contract rabies nor pass on the virus.

How soon do symptoms typically appear after a person is infected with the rabies virus?

  1. 48 hours

  2. 1 week

  3. 1 month

  4. 1 year


Correct Option: C
Explanation:

Explanation: Symptoms usually appear 30 to 90 days after exposure. Depending on the severity of the bite and the place on the body that was bitten, symptoms may appear more quickly. In rare cases, however, a person may not develop symptoms until a year or more after exposure.

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


Correct Option: C
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.

What can you do to prevent getting rabies?

  1. Have your pets and other domesticated animals regularly vaccinated against rabies.

  2. Keep your dog on a leash when you take it outside your yard.

  3. Don't approach wild animals.

  4. All of the above


Correct Option: D
Explanation:

Explanation: Since The rabies virus is transmitted to others through the saliva of the infected animal, dont touch a dead animal; make sure your home is sealed to prevent wild animals from slipping into a basement, porch or attic; report any animals that are acting strangely to your local animal control department to prevent getting rabies.

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


Correct Option: C
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'.

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