Question

What is a vaccine? Can it be obtained from bacteria?

Answer 1

• Vaccines are preparations consisting of weakened germs or dead germ substances that triggers an immune response within the body.
• When they enter the body, they cannot cause the disease, instead prompt the immune system to produce antibodies in response to the specific antigens.
• These antibodies fight against the antigens by antigen-antibody reaction.
• After killing the antigens, the antibodies are destroyed, but some immune cells called memory cells remain in the body.
• When the same pathogen attacks the person again, these memory cells produce antibodies immediately and kill the antigens before they cause the disease.
• Bacteria are widely used in medicine to produce antibiotics, serums, and vaccines.
• For example, TAB vaccine for typhoid and BCG vaccine for tuberculosis are obtained from bacteria.