why vaccines are important? how they work?
Answers
Answer:
A vaccine works by training the immune system to recognize and combat pathogens, either viruses or bacteria. To do this, certain molecules from the pathogen must be introduced into the body to trigger an immune response.
Explanation:
Advantages: Because these vaccines introduce actual live pathogens into the body, it is an excellent simulation for the immune system. So live attenuated vaccines can result in lifelong immunity with just one or two doses.
Disadvantages: Because they contain living pathogens, live attenuated vaccines are not given to people with weakened immune systems, such as people undergoing chemotherapy or HIV treatment, as there is a risk the pathogen could get stronger and cause sickness. Additionally, these vaccines must be refrigerated at all times so the weakened pathogen doesn't die.
edward ennee discovered the vaccine for small pox. when a disease carriyng microbes enters our body ,the body produce antibodies to fight the invader. The body also remembers how to fight the microbe if it enters agein . if dead or weakened microbes are introduced into a healthy body, the body fights and kills the invading bacteria by producing suitable antibodies. The antibodies remain inthe body and we are protected from the disease causing microbes for ever . this is how a vaccine works. several disease b,including cholera , tuberculosis, smallpox and hepatitis can be prevented by vaccination.......
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