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  2. Scientists Just Found Out The Flu Virus Can Shape Shift ... - AOL

    www.aol.com/scientists-just-found-flu-virus...

    On the whole, flu A viruses tend to cause a more intense illness, Dr. Russo says. “Both flu A and flu B can be lethal, but flu A tends to cause more severe disease,” he says.

  3. Attenuated vaccine - Wikipedia

    en.wikipedia.org/wiki/Attenuated_vaccine

    An attenuated vaccine (or a live attenuated vaccine, LAV) is a vaccine created by reducing the virulence of a pathogen, but still keeping it viable (or "live"). [1] Attenuation takes an infectious agent and alters it so that it becomes harmless or less virulent. [2] These vaccines contrast to those produced by "killing" the pathogen ...

  4. Smallpox virus retention debate - Wikipedia

    en.wikipedia.org/wiki/Smallpox_virus_retention...

    In November 2021 the CDC announced that several frozen vials labeled "Smallpox" were discovered in a freezer in a Merck & Co. vaccine research facility at Montgomery County, Pennsylvania. [18] [19] [20] The vials were determined to contain the vaccinia virus, used in making the vaccine, not the variola virus, which causes smallpox. [21]

  5. Live attenuated influenza vaccine - Wikipedia

    en.wikipedia.org/wiki/Live_attenuated_influenza...

    Persons receiving the live attenuated influenza vaccine may shed small amounts of the vaccine virus during the first week. People coming in contact with the vaccinated person are not considered to be at risk, unless their immune systems are severely weakened (for example, bone marrow transplant recipients) and possible recombination with other ...

  6. Health experts prep Dem lawmakers on anti-vaccine arguments ...

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    Public health experts answered questions from Democratic Senators about whether vaccines cause autism, whether manufacturers should be immune from liability for vaccine injuries, whether vaccines ...

  7. Vaccination - Wikipedia

    en.wikipedia.org/wiki/Vaccination

    This is an accepted version of this page This is the latest accepted revision, reviewed on 9 February 2025. Administration of a vaccine to protect against disease This article is about administration of a vaccine. For the vaccines themselves, see vaccine. See also: Immunization Medical intervention Vaccinations Girl about to be vaccinated in her upper arm ICD-9-CM 99.3 - 99.5 [edit on Wikidata ...

  8. Fact-checking RFK Jr.'s claims on vaccines, pesticides at ...

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    Claim: CDC approved COVID-19 vaccines "without any scientific basis." Context: COVID vaccines are among the most studied vaccines in history, with large clinical studies showing the health ...

  9. Inactivated vaccine - Wikipedia

    en.wikipedia.org/wiki/Inactivated_vaccine

    An inactivated vaccine (or killed vaccine) is a type of vaccine that contains pathogens (such as virus or bacteria) that have been killed or rendered inactive, so they cannot replicate or cause disease. In contrast, live vaccines use pathogens that are still alive (but are almost always attenuated, that is, weakened).