Immunizations play an important role in keeping your family and your community healthy. Vaccinations are important, because they not only protect the person who is receiving the vaccine, but they also help to keep diseases from spreading to others such as your family, neighbors, classmates, coworkers, and other members of the community. Immunization helps protect those who are the most vulnerable to illness, such as infants, elders, and those with weakened immune systems.
Vaccines are among the most successful and cost-effective public health tools available for preventing disease and death. In the United States, vaccines have greatly reduced infectious diseases that once routinely caused severe illness and death. According to the CDC, prior to the COVID-19 pandemic approximately 50,000 adults died every year from vaccine-preventable illnesses.
Here are some answers to frequently asked questions about getting vaccinated.
Why is it important to get vaccinated?
Because getting vaccinated is safer than getting sick!
Vaccines help the body learn how to defend itself from disease without the dangers of a full-blown infection. The immune response to a vaccine might cause tiredness and discomfort for a day or two, but the resulting protection can last a lifetime.
Infections are unpredictable and can have long-term consequences. Even mild or symptom-less infections can be deadly. For example, most people infected with the human papillomavirus (HPV) never show any sign of infection. But for some, the sign appears years later as an aggressive, life-threatening cancer. By then, it’s too late to get vaccinated.
How do vaccines work in my body?
Vaccines work by imitating an infection
Vaccines work by imitating an infection—the presence of a disease-causing organism in the body—to engage the body’s natural defenses. The active ingredient in all vaccines is an antigen, the name for any substance that causes the immune system to begin producing antibodies. In a vaccine, the antigen could be either
- Weakened or killed bacteria or viruses
- Bits of their exterior surface or genetic material, or
- Bacterial toxin treated to make it non-toxic.
How many doses of a vaccine will I need?
Many Vaccines Require More Than One Dose
A single dose of vaccine provides only partial protection. The number of doses needed to achieve immunity depends on whether the antigen in a vaccine is alive or not. Because they contain living bacteria or viruses, live-attenuated vaccines can provide enduring protection with only two doses. By contrast, non-live vaccines typically require at least three doses to achieve protection that fades over time and must be restored with booster doses.
Live-attenuated vaccines
- Offer long-lasting, even lifetime protection.
- Could cause a life-threatening infection in someone with a weak or suppressed immune system.
- Require two doses to achieve maximum immunity.
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Examples include the chickenpox vaccine and the MMR (measles, mumps, and rubella) combined vaccine, which children should receive around their first and fifth birthdays.
Non-live vaccines
- Protection fades over time.
- Safer for people with weak immune systems.
- Require three or more doses to achieve maximum immunity.
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For example, the DTaP vaccine requires repeated doses to achieve and maintain protection from diphtheria, tetanus, and pertussis (whooping cough):
- Infants receive doses at 2 months, 4 months, 6 months, and 18 months of age.
- Children get one booster dose around the time they first enter school and another when they begin middle school.
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Adults should get a tetanus booster once every 10 years or during each pregnancy.
Certain vaccines must be updated periodically to protect against mutation-prone viruses that cause waves of infections months or years apart. To stay protected, people must get the updated vaccines even if they got an earlier version.
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The seasonal flu vaccine is reformulated each year to target the four strains expected to be most common and most dangerous.
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The updated COVID-19 vaccines were developed to deal both with fading immunity and a fast-evolving virus.
Everyone Should Get Recommended Vaccines on Schedule
History shows that vaccines are the safest, most effective way to protect yourself and your family from many preventable diseases.
Everyone should get all recommended vaccines at the recommended times. It is especially important for children and adolescents to get catch-up doses of any missed vaccines or vaccine doses as soon as they can. Adults should get all recommended vaccines for their age or other risk factors such as health condition or occupation. All adults should get tetanus boosters, seasonal flu and COVID-19 vaccines, and any vaccines missed in childhood.
What is the overall benefit of a vaccine?
Vaccines Strengthen the Body’s Natural Defenses
To be immune is to be partially or fully resistant to a specific infectious disease or disease-causing organism. A person who is immune can resist the bacteria or viruses that cause a disease, but it is very important to remember that the protection is never 100% perfect.
Please note that you are always encouraged to talk to your doctor, nurse, or healthcare professional first regarding any immunizations you may be interested in getting. It’s important to ensure that you and your family are protected against serious diseases by getting caught up on routine vaccinations. No vaccine is 100% effective, but it is the first step in protecting yourself, your family, and others from serious illness.
Sometimes you are unsure of what immunizations you may need: Please click on the links below for adult and child quizzes that will help you talk to your healthcare provider.
The Adult Vaccine Assessment Tool
Child and Adolescent Vaccine Assessment Tool - Birth through 18 years of age
*All information obtained and referenced from the CDC and US Border and Customs Protection Websites.
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