Biology · General Awareness

Viral Diseases and Immunity

807 Questions

Viral diseases and immunity cover the structure, transmission, and diagnosis of viruses like HIV. Questions focus on disease pathways, immune responses, and prevention. Strong knowledge here provides an edge in biology scoring.

HIV and AIDS structureVirus transmission methodsImmune system deficiencyPathogen risk groupsMedical diagnosis methods

Viral Diseases and Immunity Questions

Multiple choice
  1. Prevention of Excessive Production

  2. Prohibitively Exorbitant Prescription

  3. Positive Expiratory Pressure

  4. Post Exposure Prophylaxis

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

PEP stands for Post Exposure Prophylaxis. This technique involves taking anti-retroviral drugs after HIV exposure in order to prevent infection. PEP should be the prevention method of last resort and should be started no later than 72 hours after exposure, and is not guaranteed to work.

Multiple choice
  1. His immune system is still very healthy.

  2. He should probably start antiretroviral treatment.

  3. He no longer has HIV.

  4. He will die within a week.

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

The more CD4 cells there are in a person's blood, the stronger the immune system. A CD4 cell count below 450 indicates that the person has a weak immune system and requires antiretroviral therapy.

Multiple choice

How does the passage proceed, as far as its construction is concerned?

Directions: Read the following passages and answer the question that follows:

PASSAGE – I

Words of warning are already being voiced. The incidence of infection with the Human Immunodeficiency Virus (HIV) and the Acquired Immune Deficiency Syndrome (AIDS) it causes could be set to explode in India and China, the world's two most populous countries. China and India stand on the brink of widespread epidemics, as HIV spreads from groups at high risk to the broader population, observed a recent report. The current low prevalence rates are deceptive. The Joint United Nations Programme on HIV/AIDS (UNAIDS) puts the prevalence of HIV among adults in India at less than one per cent, compared to nine per cent in sub-Saharan Africa, currently the worst affected region in the world. On the other hand, India stands second only to South Africa in the number of HIV-infected people. Worse still, there are reports that HIV infections are spreading twice as fast in South Asia as in sub-Saharan Africa.

There are fears that India (and South Asia) could go the sub-Saharan way. India shares some of the same risk factors as Africa, including a similar pattern of health expenditure, an uneven health infrastructure and prevalent high risk sexual behaviour.

The African experience shows what high levels of HIV in a society mean in everyday terms. According to UNAIDS, average life expectancy in sub-Saharan Africa is now 47 years, when it would have been 62 years without AIDS. Loss of income and mounting medical expenses push HIV/AIDS affected families deeper into poverty, stripping assets from the already impoverished. As parents die, the care and upbringing of children, who might themselves be infected with HIV, become major social problems. By affecting those in the prime of their lives, HIV/AIDS has a severe impact on national economies. The rate of economic growth in sub-Saharan Africa is believed to have reduced by two to four per cent as a result of AIDS.

There is as yet no effective cure which can remove the virus entirely from the body of an infected person or a vaccine which can prevent infection. But as the Global HIV Prevention Working Group said in a recent report, a massive expansion of the HIV/AIDS epidemic was not inevitable and could be reversed if proven prevention techniques were used in combination and on a sufficient scale. In India, sexual contact is the primary route through which HIV spreads. Prevention requires awareness among the public of risky sexual behaviour combined with ways to avoid such risks. As in many other tradition-bound societies, open discussion of sexual issues is often problematic in India.

The myths and realities around sex and sexuality issues in India are similar to those that exist across the world. Young people should be encouraged and provided information to make informed choices to protect themselves from infection. Inadequate funding for AIDS prevention work is a global problem. The Global HIV Prevention Working Group estimated that the funding gap in Asia and the Pacific was about $1.48 billion. While what India currently invests on AIDS prevention is much less than needed, no estimate on the extent of this deficit seems readily available. Implementation of a comprehensive prevention package can more than halve the total number of HIV infections. One-third of this global reduction would benefit two countries — India and China. But the experts also warned that delayed implementation of the prevention package would lead to large reductions in the infections prevented. India has a window of opportunity — but it may not remain open for long.

 

 

  1. The passage highlights a problem and discusses its consequences.

  2. The passage discusses a problem, suggests a solution and later refutes the same.

  3. The passage states a problem but fails to define it completely.

  4. The passage states a problem, discusses its causes and finally suggests some solutions.

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

(4) is the answer because the passage moves in this manner.

Multiple choice

What is the central idea of the passage?

Directions: Read the following passages and answer the question that follows:

PASSAGE – I

Words of warning are already being voiced. The incidence of infection with the Human Immunodeficiency Virus (HIV) and the Acquired Immune Deficiency Syndrome (AIDS) it causes could be set to explode in India and China, the world's two most populous countries. China and India stand on the brink of widespread epidemics, as HIV spreads from groups at high risk to the broader population, observed a recent report. The current low prevalence rates are deceptive. The Joint United Nations Programme on HIV/AIDS (UNAIDS) puts the prevalence of HIV among adults in India at less than one per cent, compared to nine per cent in sub-Saharan Africa, currently the worst affected region in the world. On the other hand, India stands second only to South Africa in the number of HIV-infected people. Worse still, there are reports that HIV infections are spreading twice as fast in South Asia as in sub-Saharan Africa.

There are fears that India (and South Asia) could go the sub-Saharan way. India shares some of the same risk factors as Africa, including a similar pattern of health expenditure, an uneven health infrastructure and prevalent high risk sexual behaviour.

The African experience shows what high levels of HIV in a society mean in everyday terms. According to UNAIDS, average life expectancy in sub-Saharan Africa is now 47 years, when it would have been 62 years without AIDS. Loss of income and mounting medical expenses push HIV/AIDS affected families deeper into poverty, stripping assets from the already impoverished. As parents die, the care and upbringing of children, who might themselves be infected with HIV, become major social problems. By affecting those in the prime of their lives, HIV/AIDS has a severe impact on national economies. The rate of economic growth in sub-Saharan Africa is believed to have reduced by two to four per cent as a result of AIDS.

There is as yet no effective cure which can remove the virus entirely from the body of an infected person or a vaccine which can prevent infection. But as the Global HIV Prevention Working Group said in a recent report, a massive expansion of the HIV/AIDS epidemic was not inevitable and could be reversed if proven prevention techniques were used in combination and on a sufficient scale. In India, sexual contact is the primary route through which HIV spreads. Prevention requires awareness among the public of risky sexual behaviour combined with ways to avoid such risks. As in many other tradition-bound societies, open discussion of sexual issues is often problematic in India.

The myths and realities around sex and sexuality issues in India are similar to those that exist across the world. Young people should be encouraged and provided information to make informed choices to protect themselves from infection. Inadequate funding for AIDS prevention work is a global problem. The Global HIV Prevention Working Group estimated that the funding gap in Asia and the Pacific was about $1.48 billion. While what India currently invests on AIDS prevention is much less than needed, no estimate on the extent of this deficit seems readily available. Implementation of a comprehensive prevention package can more than halve the total number of HIV infections. One-third of this global reduction would benefit two countries — India and China. But the experts also warned that delayed implementation of the prevention package would lead to large reductions in the infections prevented. India has a window of opportunity — but it may not remain open for long.

 

 

  1. To compare the rates of the prevalence of HIV in Sub Saharan Africa and South Asia

  2. To suggest a remedy to contain the spread of the AIDS epidemic in South Asia

  3. To analyze a problem, its course and consequences and to suggest methods to contain it

  4. To highlight the role of Promiscuity in spreading AIDS in South Asia

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

The passage highlights that India and China are on the brink of AIDS epidemic. Then the passage discusses the reasons and consequences of the same. In the last it discusses the methods to contain the epidemic.

Multiple choice

Which of the following can be inferred from the passage? I. High risk sexual behavior and uneven health infrastructures are risk factors similar to both Indian and Africa. II. In India and China sexual contact is the primary route through which HIV spreads. III. Increase in the level of HIV cases in society is inversely proportional to the average life expectancy.

Directions: Read the following passages and answer the question that follows:

PASSAGE – I

Words of warning are already being voiced. The incidence of infection with the Human Immunodeficiency Virus (HIV) and the Acquired Immune Deficiency Syndrome (AIDS) it causes could be set to explode in India and China, the world's two most populous countries. China and India stand on the brink of widespread epidemics, as HIV spreads from groups at high risk to the broader population, observed a recent report. The current low prevalence rates are deceptive. The Joint United Nations Programme on HIV/AIDS (UNAIDS) puts the prevalence of HIV among adults in India at less than one per cent, compared to nine per cent in sub-Saharan Africa, currently the worst affected region in the world. On the other hand, India stands second only to South Africa in the number of HIV-infected people. Worse still, there are reports that HIV infections are spreading twice as fast in South Asia as in sub-Saharan Africa.

There are fears that India (and South Asia) could go the sub-Saharan way. India shares some of the same risk factors as Africa, including a similar pattern of health expenditure, an uneven health infrastructure and prevalent high risk sexual behaviour.

The African experience shows what high levels of HIV in a society mean in everyday terms. According to UNAIDS, average life expectancy in sub-Saharan Africa is now 47 years, when it would have been 62 years without AIDS. Loss of income and mounting medical expenses push HIV/AIDS affected families deeper into poverty, stripping assets from the already impoverished. As parents die, the care and upbringing of children, who might themselves be infected with HIV, become major social problems. By affecting those in the prime of their lives, HIV/AIDS has a severe impact on national economies. The rate of economic growth in sub-Saharan Africa is believed to have reduced by two to four per cent as a result of AIDS.

There is as yet no effective cure which can remove the virus entirely from the body of an infected person or a vaccine which can prevent infection. But as the Global HIV Prevention Working Group said in a recent report, a massive expansion of the HIV/AIDS epidemic was not inevitable and could be reversed if proven prevention techniques were used in combination and on a sufficient scale. In India, sexual contact is the primary route through which HIV spreads. Prevention requires awareness among the public of risky sexual behaviour combined with ways to avoid such risks. As in many other tradition-bound societies, open discussion of sexual issues is often problematic in India.

The myths and realities around sex and sexuality issues in India are similar to those that exist across the world. Young people should be encouraged and provided information to make informed choices to protect themselves from infection. Inadequate funding for AIDS prevention work is a global problem. The Global HIV Prevention Working Group estimated that the funding gap in Asia and the Pacific was about $1.48 billion. While what India currently invests on AIDS prevention is much less than needed, no estimate on the extent of this deficit seems readily available. Implementation of a comprehensive prevention package can more than halve the total number of HIV infections. One-third of this global reduction would benefit two countries — India and China. But the experts also warned that delayed implementation of the prevention package would lead to large reductions in the infections prevented. India has a window of opportunity — but it may not remain open for long.

 

 

  1. I, II and III

  2. I and III

  3. Only II

  4. None of these

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

'Statement I' is correct. It is mentioned in the first two lines of the second paragraph. 'Statement II' is wrong because it is mentioned in the third paragraph that in India sexual contact is the primary route. China is not mentioned alongside.

Multiple choice
  1. polymerase chain reaction (PCR)

  2. reverse transcriptase

  3. real time PCR

  4. mimic PCR

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

Polymerase chain reaction is the gold standard for diagnosis in all of HIV. Reverse transcriptase PCR is sensitive for viral nucleic acid (RNA). It can detect a single copy of RNA or proviral DNA from infected cells.

Multiple choice
  1. the Kaposi's sarcoma

  2. the Hodgkin's lumphoma

  3. the Squamous cell carcinoma

  4. the Non-Hodgkin’s lymphoma

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

Opportunistic malignancies typically associated with HIV infection are Kaposi's sarcoma.