Respuesta :
A flu vaccine exists required seasonally to be effective but a polio vaccine is only needed once. the best exculpation of this exists the flu has several strains that change seasonally.
What is flu vaccine?
Influenza vaccines, sometimes referred to as flu injections or flu jabs, are immunizations that guard against contracting influenza viruses. As the influenza virus evolves quickly, new vaccine versions are created twice a year. A yearly flu shot is advised for everyone aged 6 months and older, with rare exceptions. People who are more likely to experience serious flu complications should receive vaccinations. who are eligible for the flu shot: Most people should get flu vaccines.
Vaccines against poliomyelitis are administered to prevent the disease. Inactivated polioviruses are administered intravenously, and weakened polioviruses are administered orally. The World Health Organization advises that all kids receive the entire polio vaccine.
Hence, A flu vaccine exists required seasonally to be effective but a polio vaccine is only needed once. the best exculpation of this exists the flu has several strains that change seasonally.
To learn more about flu vaccine refer to:
https://brainly.com/question/7101642
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