Question

A person likely to develop tetanus is immunised by giving
A.Weakened germs
B.Pre-formed germs
C.Dead germs
D.Wide spectrum antibodies

Answer 1

Hint: 1.Tetanus is characterised as a bacterial infection of high intensity. 2.This causes muscle spasms and can lead to death.

Complete answer:
Tetanus is caused by a bacteria called clostridium tetani. They are found in the form of spores in the environment. Once they enter the body, they will develop into bacteria. They usually get inside the body through breaks in the skin when we step on nails or sharp objects or wounds that are polluted by spit,feces or dirt etc. The incubation period until the symptoms starts to appear is 21 weeks.
Tetanus cannot be cured; it can only be prevented. A person who is likely to develop tetanus is given a tetanus vaccination or usually known as TT(Tetanus toxoid). This vaccine is made by chemically treating the tetanus bacteria.They are treated using certain toxins so that they will be able to produce some immune response in the body of the injected person. These injected bacteria are not capable of division and replication,so it is not harmful for the body and at the same time helps it produce antibodies. So they are termed as inactive.

Option A) As the bacteria in the vaccine is made inactive using formaldehyde they can also be characterized as weakened germs as they are not dead. Therefore this is the Correct option
Option B) A person who is likely to develop tetanus is provided with pre-formed antibodies in some cases of emergency,not pre-formed germs. Therefore this is an incorrect option
Option C) Dead germs are not provided in the tetanus vaccine. Therefore this is an incorrect option
Option D) Wide spectrum of antibodies are not provided to a person who is likely to develop tetanus. Therefore this is an incorrect option

Hence, the correct answer is option (A)

Note: In some cases of emergency, a person who is likely to develop tetanus is provided with pre-formed antibodies where the antibodies are grown in some animal body. This provides passive immunity to the person. The antibodies are produced by giving the antigens to the animals.