Are vaccines an effective tool to prevent disease?

Vaccines prevent disease — I'll gather evidence on their effectiveness for you.

Yes, vaccines are considered one of the most effective tools to prevent disease.

> Vaccination is one of the most effective ways to prevent diseases. Over the past 50 years, essential vaccines against just 14 diseases have saved at least 154 million lives

> The WHO currently ranks vaccination as one of the most effective and cost-effective public health interventions

Evidence of Effectiveness

•Prevention of serious illness and death: Immunization prevents between 3.5 million and 5 million deaths each year from diseases such as diphtheria, tetanus, pertussis, influenza, and measles

•Large scale impact modeled: A study published in The Lancet, the landmark 2024 WHO study, modeled five decades of the Expanded Programme on Immunization and found that vaccination against 14 key pathogens has saved an estimated 154 million lives worldwide since 1974. During the same period, vaccination has contributed to 40% of the drop in infant deaths

•U.S. data: Vaccines are available for these potentially dangerous or deadly diseases. Over the years, these vaccines have prevented countless cases of disease and saved lives. Research shows that routine vaccinations for children born during 1994–2023 will have prevented about 508 million illnesses and 32 million hospitalizations and saved over 1.1 million lives

•Eradication and control: In 1980, the World Health Organization (WHO) declared smallpox eradicated worldwide... through a vaccine administered systematically and in a coordinated manner on a global scale. Vaccines are the most effective tool to prevent the outbreak of many dangerous diseases, including polio and measles

•Individual protection:

•Vaccines can prevent common diseases that used to seriously harm or even kill infants, children, and adults. Without vaccines, your child is at risk of becoming seriously ill or even dying from childhood diseases such as measles and whooping cough

•Vaccination is a safe, highly effective, and easy way to help keep your family healthy

•At an individual level, vaccines are very effective at providing protection against certain diseases, though they don’t provide immunity in 100 per cent of cases

•The American Academy of Pediatrics states that "most childhood vaccines are 90%-99% effective in preventing disease."

•The Centers for Disease Control and Prevention (CDC) found that vaccines effectively produced immunity in 85-95 percent of patients

•Described as best prevention:

•Vaccines are among the most successful and cost-effective public health tools available for preventing serious disease and death

•It is always better to prevent a disease than to treat one after it occurs

•Community protection (herd immunity): Beyond individual protection, we must not overlook the collective benefits generated by vaccines, often referred to as herd immunity. This form of immunity protects people who cannot be vaccinated because the virus or bacterium encounters fewer hosts susceptible to infection

How well do they work?

Vaccines teach the immune system to fight germs and typically take a few weeks for protection to develop after vaccination, but that protection can last a lifetime, with some requiring booster doses. Effectiveness varies by vaccine, disease, age, and variants, and no vaccine is 100% effective for every person, but on a population level they substantially reduce infection, severe disease, hospitalization and death, and are a central public health strategy to prevent outbreaks.

Citations (4)

1who.intGovernment
Vaccines and immunization: Vaccine safety
Backs: “Yes, vaccines are considered one of the most effective tools to prevent disease. Vaccination is one of the most effective ways to prevent diseases. Over the past 50 years, essential vaccines against just 14 diseases have saved at least 154 million lives”
2medscape.comNews and mediaquality 0.93
Vaccines Saved Millions: The Success That Became Invisible
Backs: “Over the past 50 years, essential vaccines against just 14 diseases have saved at least 154 million lives. The WHO currently ranks vaccination as one of the most effective and cost-effective public health interventions”
3cdc.govGovernment
Vaccines and the Diseases they Prevent
Backs: “data: Vaccines are available for these potentially dangerous or deadly diseases. Over the years, these vaccines have prevented countless cases of disease and saved lives.”
4cdc.govGovernment
Reasons to Vaccinate
Backs: “Vaccines can prevent common diseases that used to seriously harm or even kill infants, children, and adults. Without vaccines, your child is at risk of becoming seriously ill or even dying from childhood diseases such as measles and whooping cough”