bioloogiline preparaat, mille abil aktiveeritakse organismi spetsiifiline immuunvastus
A vaccine is a biological preparation that provides active acquired immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins or one of its surface proteins.
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Vaktsiinid sisaldavad immuunreaktsioone indutseerivaid antigeene või madala virulentsusega elusaid mikroorganisme (elusvaktsiinid).
