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A vaccine:

A.

Gives active artificial immunity

B.

Is a gamma globulin

C.

Contains antibodies

D.

Gives active natural immunity

Answer and Explanation

The Correct Answer is A

A. Gives active artificial immunity

    Vaccines stimulate the body’s immune system to produce antibodies and memory cells, creating active immunity artificially.

B. Is a gamma globulin

  Gamma globulin is a preparation of antibodies used for passive immunity, not a vaccine.

C. Contains antibodies

  Vaccines usually contain antigens (weakened or inactivated parts of a pathogen), not antibodies.

D. Gives active natural immunity

  Active natural immunity is obtained through actual infection, not vaccination.


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Related Questions

Correct Answer is B

Explanation

A. Digestive system through contaminated feces:

This is the port of exit for diseases spread by the fecal-oral route (e.g., cholera, hepatitis A).

B. Respiratory system by coughing or sneezing:

Droplet infections (e.g., flu, COVID-19, common cold) are primarily spread through respiratory secretions expelled via coughing or sneezing.

C. Central nervous system by contaminated cerebral spinal fluid:

While CSF can carry infections (e.g., meningitis), it is not a common port of exit.

D. Urinary system by contaminated urine:

Urinary tract infections may be transmitted this way, but not typically through droplets.

Correct Answer is B

Explanation

A. The virus affects the red blood cells

HIV primarily affects CD4+ T-helper white blood cells, not red blood cells.

B. The virus affects the white blood cells

HIV destroys CD4+ T-cells, weakening the immune response, leading to immunodeficiency.

C. The virus affects the platelets

Platelets are involved in clotting, not in the immune deficiency caused by HIV.

D. The virus affects the liver

Although medications for HIV may affect the liver, HIV itself targets the immune system, not liver cells directly.

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