Trevor James
The Centers for Disease Control and Prevention (CDC) changed its definition of a vaccine from a product that stimulates a person's immune system to produce immunity to a specific disease, protecting the person from the disease to a preparation that is used to stimulate the body's immune response against diseases. The change was made to increase transparency and prevent people from interpreting the definition as vaccines being 100% effective, which they are not. The CDC also altered its definition of vaccination, removing the word immunity and replacing it with protection.
| Characteristics | Values |
|---|---|
| Previous definition of vaccine | "A product that stimulates a person's immune system to produce immunity to a specific disease, protecting the person from that disease" |
| New definition of vaccine | "A preparation that is used to stimulate the body's immune response against diseases" |
| Reason for change | To be more transparent and avoid implying 100% effectiveness |
| Previous definition of vaccination | "The act of introducing a vaccine into the body to produce immunity to a specific disease" |
| New definition of vaccination | "The act of introducing a vaccine into the body to produce protection from a specific disease" |
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What You'll Learn
- The CDC changed the definition of a vaccine to be 'more transparent'
- The previous definition could be interpreted as vaccines being 100% effective
- The new definition changed 'immunity' to 'protection'
- The change was not due to COVID-19 vaccines being ineffective
- The CDC also changed the definition of 'vaccination'
The CDC changed the definition of a vaccine to be 'more transparent'
The Centers for Disease Control and Prevention (CDC) changed its definition of a vaccine in 2021 to be more transparent. The previous definition stated that a vaccine was:
> a product that stimulates a person's immune system to produce immunity to a specific disease, protecting the person from that disease.
The new definition defines a vaccine as:
> a preparation that is used to stimulate the body's immune response against diseases.
The key differences are the absence of the word "immunity" and the change to "protection" in the new definition. According to a CDC spokesperson, the previous definition could be interpreted to mean that vaccines are 100% effective, which has never been the case for any vaccine. The new definition, therefore, provides more clarity and transparency.
The CDC also changed the definition of "vaccination" in 2018. The previous definition was:
> the act of introducing a vaccine into the body to produce immunity to a specific disease.
The new definition is:
> the act of introducing a vaccine into the body to produce protection from a specific disease.
The change from "immunity" to "protection" is significant as it more clearly defines expectations. While mRNA vaccines, for example, can protect against severe illness or death from COVID-19, they do not provide complete immunity.
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The previous definition could be interpreted as vaccines being 100% effective
The Centers for Disease Control and Prevention (CDC) changed its definition of a vaccine in 2021. The previous definition, which dated back to at least 2015, stated:
> "A product that stimulates a person's immune system to produce immunity to a specific disease, protecting the person from that disease."
The new definition is:
> "A preparation that is used to stimulate the body's immune response against diseases."
The key differences are the removal of the word "immunity" and the change to "protection". A CDC spokesperson said that the previous definition could be interpreted to mean that vaccines were 100% effective, which has never been the case for any vaccine. The new definition is more transparent and clearly defines expectations. The COVID-19 vaccines, for example, do not prevent all infections but have been shown to reduce the likelihood of severe illness or death.
The CDC's definition of "vaccination" was also updated. The previous definition was:
> "The act of introducing a vaccine into the body to produce immunity to a specific disease."
The new definition is:
> "The act of introducing a vaccine into the body to produce protection from a specific disease."
The change from "immunity" to "protection" is again intended to clarify that no vaccine is 100% effective.
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The new definition changed 'immunity' to 'protection'
The Centers for Disease Control and Prevention (CDC) changed its definition of a vaccine in 2018. The new definition changed "immunity" to "protection". The previous definition stated that a vaccine was:
> "A product that stimulates a person's immune system to produce immunity to a specific disease, protecting the person from that disease."
The new definition states that a vaccine is:
> "A preparation that is used to stimulate the body's immune response against diseases."
The key difference between the two definitions is the absence of the word "immunity" in the new definition and the change to "protection" instead. The CDC stated that the previous definition could be interpreted to mean that vaccines were 100% effective, which has never been the case for any vaccine. The new definition is more transparent and clearly defines expectations. It is important to note that the change in definition does not reflect the effectiveness of the COVID-19 vaccines, which are extremely effective, particularly against severe illness and death.
The CDC also changed the wording for the definition of "vaccination." The previous definition was:
> "The act of introducing a vaccine into the body to produce immunity to a specific disease."
The new definition is:
> "The act of introducing a vaccine into the body to produce protection from a specific disease."
Again, the key difference is the change from "immunity" to "protection." This change was made to clarify that vaccines do not provide absolute immunity to a disease but rather stimulate the body's immune response to provide protection.
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The change was not due to COVID-19 vaccines being ineffective
The Centers for Disease Control and Prevention (CDC) did change the definition of a vaccine from "a product that stimulates a person's immune system to produce immunity to a specific disease, protecting the person from that disease" to "a preparation that is used to stimulate the body's immune response against diseases." However, the change was not due to COVID-19 vaccines being ineffective.
Firstly, the change in definition was made in 2018, according to an archived CDC web page, which predates the COVID-19 pandemic and the subsequent vaccine development and rollout. This change was also made to the definition of "vaccination."
Secondly, a spokesperson for the CDC stated that the previous definition could be misinterpreted as implying that vaccines are 100% effective, which has never been the case for any vaccine. The new definition, therefore, provides more transparency and clearly defines expectations. The change from "immunity" to "protection" reflects the reality that even with vaccination, one may still catch COVID-19, but the likelihood of severe illness or death is significantly reduced.
It is important to note that the COVID-19 vaccines, including the Pfizer and Moderna vaccines, are effective, particularly in preventing severe illness and death. The CDC emphasizes that mRNA vaccines, which are a new technology for the public, have been studied for decades for other viruses such as the flu, Zika, and rabies.
In summary, while the CDC did update the definition of a vaccine, this change occurred before the COVID-19 pandemic and was made to provide clarity and transparency regarding vaccine effectiveness. The new definition better reflects the reality of vaccine protection, and COVID-19 vaccines have proven to be highly effective in reducing severe illness and deaths associated with the virus.
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The CDC also changed the definition of 'vaccination'
The CDC changed its definition of a vaccine in 2021 to make it more transparent. The previous definition stated that a vaccine was "a product that stimulates a person's immune system to produce immunity to a specific disease, protecting the person from that disease". The new definition defines a vaccine as "a preparation that is used to stimulate the body's immune response against diseases". The key difference is the absence of the word "immunity" and the change to "protection" instead. The CDC stated that the previous definition could be interpreted to mean that vaccines were 100% effective, which has never been the case for any vaccine.
The CDC also changed the definition of vaccination, which is distinct from the definition of a vaccine. In 2018, the CDC defined vaccination as "the act of introducing a vaccine into the body to produce immunity to a specific disease". The updated definition, as of September 2021, is "the act of introducing a vaccine into the body to produce protection from a specific disease". Again, the CDC clarified that the change was made to improve transparency and clearly define expectations. The new definition reflects the fact that even if you are vaccinated, you may still catch the disease, but you are much less likely to become severely ill or die from it.
The change in definition came amid claims on social media that the COVID-19 vaccines were ineffective. However, sources emphasize that the COVID-19 vaccines are extremely effective, particularly against severe illness and death. The CDC's updated definition of vaccination is in line with Merriam-Webster's updated definition, released in December.
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Frequently asked questions
Yes, the CDC changed its definition of a vaccine in 2021 to make it more transparent.
The previous definition of a vaccine was "a product that stimulates a person's immune system to produce immunity to a specific disease, protecting the person from that disease".
The new definition of a vaccine is "a preparation that is used to stimulate the body's immune response against diseases".
