Are vaccines an effective tool to prevent disease?

Yes

Yes, vaccines are one of the most effective, safe, and cost-efficient public health tools ever developed to prevent disease and save lives. Medical consensus across major global health authorities—including the World Health Organization (WHO) and the U.S. Centers for Disease Control and Prevention (CDC)—points to vaccination as a foundational pillar of modern medicine.

How vaccines achieve this and the measurable impact they have globally are detailed below:

1. How Vaccines Work

Vaccines prevent disease by working with your body’s natural defenses to safely build immunity. They introduce a harmless, weakened, or inactive part of a virus or bacterium (or mRNA instructions to make a harmless protein) to your immune system. This trains your body to create antibodies to fight the pathogen.

•Safe practice: Because vaccines only contain weakened, killed, or partial forms of a germ, they safely build immunity without exposing you to the disease or its severe, potentially life-threatening complications.

2. Global Lives Saved

According to the World Health Organization, immunization currently prevents 3.5 million to 5 million deaths every year from diseases like diphtheria, tetanus, pertussis (whooping cough), influenza, and measles.

•In childhood vaccination programs alone, vaccines save approximately 4 million lives globally every year.

•The WHO estimates that more than 50 million deaths can be prevented globally through immunization between 2021 and 2030.

3. Long-Term Impact in the United States

According to historical data and modeling by the CDC, routine childhood vaccinations administered to American children born between 1994 and 2023 will have:

•Prevented approximately 508 million illnesses.

•Prevented 32 million hospitalizations.

•Saved over 1.1 million lives.

4. Disease Eradication and Elimination

Vaccines have the unique power to completely wipe out diseases if high vaccination rates are maintained globally:

•Smallpox: In 1980, after a coordinated global vaccination campaign, smallpox was declared officially eradicated. It remains the only human infectious disease to be completely eradicated through medical intervention. Before this, smallpox killed up to 30% of its victims and killed an estimated 300 million people in the 20th century alone.

•Polio: Polio once paralyzed and killed hundreds of thousands of children annually. Thanks to the oral and inactivated polio vaccines, wild polio cases have been reduced by over 99% globally, leaving the virus endemic in only a few isolated regions.

•Other Controlled Diseases: Diseases that were once common childhood rites of passage—such as measles, mumps, rubella, and diphtheria—are now highly rare in countries with robust, routine vaccination schedules.

5. Community Protection (Herd Immunity)

When a large portion of a community is vaccinated against a disease, it becomes much harder for that pathogen to spread. This concept, known as herd immunity or community immunity, is vital because it protects vulnerable individuals who cannot be vaccinated, including:

•Newborn babies who are too young for certain vaccines.

•Individuals undergoing chemotherapy or immunosuppressive treatments.

•People with severe allergies to vaccine ingredients.

6. Economic Benefits

Immunization is widely recognized as one of the best health investments money can buy. Beyond saving lives, vaccines prevent devastating economic strain on families, healthcare systems, and national economies. The CDC reports that each dollar spent on immunization saves an estimated $52 in low- and middle-income countries by preventing hospitalizations, lost productivity, and long-term disability treatment.

Citations (7)

1cdc.govGovernment
cdc.gov
Backs: “Yes, vaccines are one of the most effective, safe, and cost-efficient public health tools ever developed to prevent disease and save lives. Medical consensus across major global health authorities—including the World Health Organization (WHO) and the U.S.”
attribution, other, points to yes. Claim: Vaccines are among the most effective, safe, cost-efficient public health tools; CDC and WHO consensus treats vaccination as a foundational pillar.
2who.intGovernment
who.int
Backs: “Yes, vaccines are one of the most effective, safe, and cost-efficient public health tools ever developed to prevent disease and save lives. Medical consensus across major global health authorities—including the World Health Organization (WHO) and the U.S.”
attribution, other, points to yes. Claim: Vaccines are among the most effective, safe, cost-efficient public health tools; WHO and CDC consensus treats vaccination as foundational.
3cdc.govGovernment
cdc.gov
Backs: “Long-Term Impact in the United States. According to historical data and modeling by the CDC, routine childhood vaccinations administered to American children born between 1994 and 2023 will have: Prevented approximately 508 million illnesses. Prevented 32 million hospitalizations.”
statistic, other, points to yes. Claim: CDC modeling: childhood vaccinations for 1994-2023 births prevent 508 million illnesses, 32 million hospitalizations, and over 1.1 million deaths.
4historyofvaccines.orgNonprofits and think tanks
historyofvaccines.org
Backs: “Disease Eradication and Elimination. Vaccines have the unique power to completely wipe out diseases if high vaccination rates are maintained globally: Smallpox: In 1980, after a coordinated global vaccination campaign, smallpox was declared officially eradicated.”
evidence, other, points to yes. Claim: Vaccines can eradicate diseases, such as smallpox and reduce polio, if high vaccination rates are maintained.
5historyofvaccines.orgNonprofits and think tanks
historyofvaccines.org
Backs: “Disease Eradication and Elimination. Vaccines have the unique power to completely wipe out diseases if high vaccination rates are maintained globally: Smallpox: In 1980, after a coordinated global vaccination campaign, smallpox was declared officially eradicated.”
evidence, other, points to yes. Claim: Vaccines can eradicate diseases, such as smallpox and reduce polio, if high vaccination rates are maintained.
6who.intGovernment
who.int
Backs: “Disease Eradication and Elimination. Vaccines have the unique power to completely wipe out diseases if high vaccination rates are maintained globally: Smallpox: In 1980, after a coordinated global vaccination campaign, smallpox was declared officially eradicated. It remains the only human infectious disease to be…”
evidence, other, points to yes. Claim: Smallpox was declared eradicated in 1980 after a global vaccination campaign.
7polioeradication.orgNonprofits and think tanks
polioeradication.org
Backs: “Disease Eradication and Elimination. Vaccines have the unique power to completely wipe out diseases if high vaccination rates are maintained globally: Smallpox: In 1980, after a coordinated global vaccination campaign, smallpox was declared officially eradicated. It remains the only human infectious disease to be…”
statistic, other, points to yes. Claim: Wild polio cases have fallen by over 99% globally thanks to polio vaccines.