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51. List two main immuno-deficiency disorders and mention their cause.

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52. Give full name of human disease caused by HIV in which body loses its general immunity towards infections. How is this disease transmitted ?

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53. Differentiate immuno deficiency and autoimmune diseases.

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54. What are symptoms of allergic reactions ?

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55. What are vaccines ? Explain the mechanism.

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56. Write the preference of order for organ transplantation -sibling, identical twin, unrelated donorand parent.

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57. Who are at higher risk of getting HIV infection?

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Characteristic features of AIDS are-:

1. Decreased Number of T-helper cells.

2. Person suffers form fever , weight loss and diarrhoea.

3. Person become susceptible to the infections due to bacteria especially Mycobacterium, viruses, fungi and parasites like Toxoplasma.

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59. Which test is done to detect HIV infection ?

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60. Name the test for detection of
(i) AIDS
(ii) Typhoid.

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