39. If a microorganism has a low infectious dose, then it has A) a low virulence

Question

39. If a microorganism has a low infectious dose, then it has A) a low virulence B) no virulence C no disease-causing abilities D) a high virulence D the ability to infect oells at a low efficiency 40. The cel cells are A) basophils B) NK cells C dendritic cells D) macrophages Is of the second line of defense that recognize and kill virus-infected oells and tumor B oells 41. The release of interferons by the host oells to inhibit the spread of viral infections is considered A) the first line of defense B) the second line of defense C the third line of defense D) speificimmunity E phagocytosis

Explanation / Answer

39)D a high virulence

a microorganisms having low infectious dose means it has high virulence that is low . infectious dose means amount of pathogen is required to cause an infection.virulence is the severity of disease.so here microorganisms has low infectious dose that means it is high ly virulent.

40)B natural killer cell

They have diverse biological function its its function is recognizing and killing virally infected cell and neoplastic cells.they are mostly inactivated but activation by cytokines leads to infiltration of these cells to whole body .the cause pores into body.

41)b second line of defense

It is non specific immune response.interferons are specific type of cytokine that provide protection from virus and tumor.infected cell release interferon which alert surrounding cells to reduce their susceptibility to infective cells.they also allot natural killer cell.

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