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vacunas vivas
Live vaccines prepared from microorganisms which have undergone physical adaptation (e.g., by radiation or temperature conditioning) or serial passage in laboratory animal hosts or infected tissue/cell cultures, in order to produce avirulent mutant strains capable of inducing protective immunity.
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La Gran Muralla de China
La Gran Muralla China es una serie de fortificaciones de piedra y tierra en el norte de China, construida para proteger la frontera norte del imperio ...