Read the  passage and answer the questions :-

Vaccines work to prime your immune system against future “attacks” by a particular disease. There are vaccines against both viral and bacterial pathogens, or disease-causing agents. When a pathogen enters your body, your immune system generates antibodies to try to fight it off. Depending on the strength of your immune response and how effectively the antibodies fight off the pathogen, you may or may not get sick.

If you do fall ill, however, some of the antibodies that are created will remain in your body playing watchdog after you’re no longer sick. If you’re exposed to the same pathogen in the future, the antibodies will ”recognize” it and fight it off. Which of the following is not true regarding vaccines?

Vaccines are preparations of antibodies.

Edward Jenner discovered the first vaccine against small pox.

Vaccines strengthen the immune system of the body.

Vaccines are disease specific means of preventing diseases.


Ans. Option a): "Vaccines are preparations of antibodies" is an incorrect statement. 

Vaccines are not preparations of antibodies rather they contain antigens which induce the body to produce antibodies. Vaccination is the process of administering an antigen into an individual so that the individual is able to fight against specific disease by boosted immune response.
In vaccination the microorganism (or antigen) is given in an inactive form (like heated) so that the body’s immune response produces antibodies against this antigen. The immune system of the body recognises this antigen and when second time the same pathogen attacks the body a heightened immune response eliminates the pathogen by making the antibodies. 

  • 0
What are you looking for?