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Most scientists, physicians, and public health researchers have concluded that there is no association between vaccines and autism. Some, however, still question whether vaccines play a role in autism.
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Vaccines are made using several different processes. They may contain live viruses that have been attenuated (weakened or altered so as not to cause illness); inactivated or killed organisms or viruses; inactivated toxins (for bacterial diseases where toxins generated by the bacteria, and not the bacteria themselves, cause illness); or merely segments of the pathogen (this includes both subunit and conjugate vaccines). -
The human immune system is essential for our survival in a world full of potentially dangerous microbes.
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Typhoid fever is a bacterial disease caused by Salmonella typhi. While rare in industrialized countries, typhoid fever is a significant threat in some low-income countries.
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Cholera is a diarrheal illness caused by an infection with cholera bacteria. Oral vaccines are available to prevent cholera.
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Ebola virus disease reached unprecendented epidemic levels in 2014. Vaccines to prevent EVD are in clinical trials.
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Scientists are developing ways to harness the immune system to treat cancer. Many therapeutic cancer vaccines are in development.
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Chickenpox is an illness caused by the Varicella zoster virus. It was once an almost universal childhood illness. It is much less common now owing to widespread vaccination.
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Chickenpox is an illness caused by the Varicella zoster virus. It was once an almost universal childhood illness. It is much less common now owing to widespread vaccination.