Science & Tech
vaccine
medicine
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Science & Tech
- Related Topics:
- smallpox vaccine
- COVID-19 vaccine
- hepatitis B vaccine
- rubella vaccine
- mumps vaccine
Recent News
Jan. 23, 2024, 4:19 AM ET (NBC)
World's first malaria vaccine program for children starts in Cameroon
Jan. 19, 2024, 4:54 AM ET (BBC)
Get measles vaccine to avoid rapid spread, says UK health boss
Jan. 15, 2024, 4:08 PM ET (ABC News (Australia))
Travellers urged to check measles vaccine doses after baby becomes confirmed case in Sydney
Jan. 9, 2024, 12:15 PM ET (AP)
Suspected militants kill 2 police officers assigned to protect polio workers in northwest Pakistan
Jan. 8, 2024, 3:27 AM ET (AP)
Pakistani Taliban claims responsibility for bomb that killed 6 police guarding anti-polio campaign
Top Questions
What is a vaccine?
How are vaccines made?
What is a vaccine delivery system?
How do vaccines work?
vaccine, suspension of weakened, killed, or fragmented microorganisms or toxins or other biological preparation, such as those consisting of antibodies, lymphocytes, or messenger RNA (mRNA), that is administered primarily to prevent disease. A vaccine can confer active immunity against a specific harmful agent by stimulating the immune system to attack the agent. Once stimulated by a vaccine, the antibody-producing cells, called B cells (or B lymphocytes), remain sensitized and ready to respond to the agent should it ever gain entry to the body. A vaccine may also confer passive immunity by providing antibodies or lymphocytes already made by an animal ...(100 of 1562 words)