Qn. 1.
Vaccines work by training the immune system to identify and fight pathogens. Pathogens are bacteria and viruses that invade and destroy the body. The vaccine contains a small portion of the pathogens that trigger the body's immune system to produce a response against the invading pathogen. After the first trigger, the body masters the process, and it becomes able to repeat it in future endeavors. In cases where the vaccine is introduced to an individual with a weak immune system, the vaccine's pathogens become strong and cause harm. In this case, the body attacks itself.
Qn. 2.
Bacteria indeed cause most of the diseases that we get vaccinations for, but viruses cause some. Antibiotics only defend the body against diseases caused by bacteria and not viruses. Unlike bacteria, most viral diseases do not yet have a cure because viruses depend on the host's body to reproduce. Therefore, we can only prevent diseases caused by viruses hence the importance of viral vaccines. Not using viral vaccines will result in more harm than good.
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Qn. 3.
Vaccines may have side effects, especially since they contain small amounts of the invading pathogens. There are instances when the side effects have proven to be severe. These are risks that we are aware of. However, they are not worth doing away with the entire vaccination process. Vaccinations have proven beneficial to the body, helping it to combat pathogens. They have helped in the complete eradication of some diseases. Besides, cases in which the side effects of vaccinations have been encountered are few compared to vaccinations' success cases. For this reason, vaccines are worth the risk.