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The answer here lies in epidemiology and the pathogenic nature of the virus. Humans infected with Ebola have a range of recovery rates of 5-75%, meaning that most of those infected will not survive infection. Given the combination of preparedness factors at first recognizing a true outbreak in Ebola and viral load which had already been spread by the point ...


Short answer: Because your immune system adapts to the virus causing the flu or the common cold and, thus, you become immune to it. Longer answer: When B cells first encounter an antigen (usually a protein on the surface of a pathogen), the antigen attaches to a receptor, stimulating the B cells. Some B cells change into memory cells, which remember ...

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