Vaccines are considered one of the most important scientific breakthroughs in modern history. Vaccines provide immunity against certain infections by training our immune system to recognize these infections. They introduce an antigen into the body, which stimulates the production of antibodies. Since the antigen has either been weakened or killed, vaccines usually do not make us feel ill. Because vaccines are crucial to stop the spread of disease, they are recommended by health experts worldwide.
Facts on Vaccines
Vaccines prevent 4-5 million deaths each year.
Measles mortality has declined 73% worldwide due to vaccines.
Polio has been eliminated in the United States due to widespread vaccination.
Vaccines can prevent around 27 infections
The chance of having a severe reaction to a vaccine is approximately 1 in one million.
Years of scientific study has proved that there is no link between vaccinations and autism, as autism develops before birth.
Types of Vaccines
Antigen is dead when introduced into the body.
Antigen has been weakened when introduced into the body.
Subunit, Recombinant, Polysaccharide and Conjugate Vaccines
Specific parts of the antigen is introduced into the body (protein, sugar, capsid)
Toxin made by the antigen is introduced into the body. Creates immunity to the part of the antigen that causes the disease.
Instructs cells to make a protein that triggers an immune response.
COVID-19 (Pfizer and Moderna)
Viral Vector Vaccines
A modified version of a different virus is introduced into the body.
COVID-19 (Johnson & Johnson)
As of now, there are four COVID vaccines authorized by the FDA.
Age 6 months +
Age 6 months +
Johnson and Johnson
Age 12 +
Asking the Experts
Patrick J. Kenney, D.O., F.A.C.O.I.