Are vaccines an effective tool to prevent disease?

I'll search current evidence on how effectively vaccines prevent disease.

Yes, vaccines are widely recognized by leading health authorities as one of the most effective tools to prevent infectious disease.

> Vaccination is one of the most effective ways to prevent diseases.

> Immunization is a global health success story, saving millions of lives every year. Vaccines reduce risks of getting a disease by working with your body’s natural defenses to build protection.

Vaccines prepare the immune system to recognize an infectious organism before someone encounters it. While vaccines cannot always prevent infection, they can substantially reduce the risk of serious disease.

Evidence of effectiveness

1.Large-scale mortality prevention:

•Over the past 50 years, essential vaccines against just 14 diseases have saved at least 154 million lives. During the same period, vaccination has contributed to 40% of the drop in infant deaths.

•We now have vaccines to prevent more than 30 life-threatening diseases and infections, and immunization currently prevents 3.5 million to 5 million deaths every year from diseases like diphtheria, tetanus, pertussis (whooping cough), influenza and measles.

2.Historical eradication and control:

•On 8 May 1980, the Thirty-third World Health Assembly declared that smallpox had been eradicated globally. Smallpox, which by some estimates killed 300 million people in the 20th century, was declared eradicated by the World Health Organization (WHO) in 1980.

•through a global vaccination campaign led by the World Health Organization (WHO), smallpox was declared eradicated in 1980.

•Since the implementation of widespread vaccination, measles infections have reduced by over 99%, illustrating the critical role vaccines play in disease control.

3.Recent U.S. data:

•Among children born during 1994–2023, routine childhood vaccinations will have prevented approximately 508 million cases of illness, 32 million hospitalizations, and 1,129,000 deaths.

•Among approximately 117 million children born during 1994–2023, routine childhood vaccinations will have prevented approximately 508 million lifetime cases of illness, 32 million hospitalizations, and 1,129,000 deaths.

4.Vaccine-specific efficacy rates:

•Though no vaccine is 100% effective, many come quite close. For instance, two doses of the chickenpox vaccine are 98% effective against any form of chickenpox, and many vaccines against deadly diseases – such as smallpox, yellow fever, measles - are over 95% effective, as long as they are administered on schedule.

•Childhood immunization has proven so effective at protecting children against everything from mumps (78 percent effective) and whooping cough (75-80 percent effective) to polio (90 percent effective), measles (95 percent effective) and diphtheria, chickenpox and rubella (95 percent effective).

•Studies have shown that influenza vaccines can reduce the risk of influenza illness by 40-60%.

5.Community protection (herd immunity):

•Highly contagious diseases like measles require around 95% vaccination rates to maintain effective herd immunity.

Safety and benefit-risk balance

Vaccines undergo rigorous testing through multiple phases of clinical trials before approval, and continue to be monitored for safety after introduction.

A person is far more likely to be seriously harmed by a disease than by a vaccine. Vaccine-preventable diseases like measles, meningitis, hepatitis B or polio can be deadly or cause severe illness and disability.

In summary, evidence from WHO, CDC and peer-reviewed studies shows vaccines do not provide absolute 100% protection for every individual, but they are highly effective at preventing disease, severe illness, complications, and death, and are critical to the prevention and control of infectious disease outbreaks.

Citations (4)

1who.intGovernment
Vaccines and immunization: Vaccine safety
Backs: “Yes, vaccines are widely recognized by leading health authorities as one of the most effective tools to prevent infectious disease.”
2who.intGovernment
Vaccines and immunization
Backs: “Immunization is a global health success story, saving millions of lives every year. Vaccines reduce risks of getting a disease by working with your body’s natural defenses to build protection.”
3cdc.govGovernment
Eradication: Lessons From the Past
Backs: “We now have vaccines to prevent more than 30 life-threatening diseases and infections, and immunization currently prevents 3.5 million to 5 million deaths every year from diseases like diphtheria, tetanus, pertussis (whooping cough), influenza and measles. Historical eradication and control: On 8 May 1980, the…”
4cdc.govGovernment
Health and Economic Benefits of Routine Childhood Immunizations in the Era of the Vaccines for Children Program — United States, 1994–2023
Backs: “Since the implementation of widespread vaccination, measles infections have reduced by over 99%, illustrating the critical role vaccines play in disease control. Recent U.S. data: Among children born during 1994–2023, routine childhood vaccinations will have prevented approximately 508 million cases of illness, 32…”