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Suspension of organisms or fractions of organisms used to induce immunity against a disease.
VACCINE
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Etymology (origin) of = vaccine
vacca -- latin for cow
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How does a vaccination work?
1. primary immune response (formation of antibodies & memory cells)
2. pathogen is encountered again = rapid/intense secondary response
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Why is vaccination often the only feasible way to control most viral diseases?
Viruses can't be treated with antibiotics
Antiviral drugs are limited
Primes the immune system before exposure.
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Attenuated vaccine
- Live, weakened pathogens
- closely mimics infection
- long-lasting immunity
- MMR vaccine
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Inactivated (killed) vaccine
- Killed pathogen
- safer and requires boosters
- mostly humoral vaccine
- Salk (injected) polio vaccine