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| Pregunta | Respuesta |
| Natural-Active Immunity | Immunity achieved by being infected by a pathogen, which is memorized by memory lymphocytes. |
| Natural-Passive Immunity | Immunity Achieved via antibodies in breast milk and the placenta |
| Artificial-Active Immunity | Immunity Achieved via vaccination |
| Artificial-Passive Immunity | Immunity Achieved via injection of antibodies into the bloodstream. |
| Herd Immunity | By vaccinating a population group, even those not vaccinated are protected from the disease. |
| Ring Immunity | By vaccinating only the people closest to an infected person, the rest of the population is protected. |
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