If Aliens invaded your body, would your immune system cope?

The discovery of liquid water on some planetary bodies could be a sign that the Earth is not the only one to harbor life. But if micro-organisms from far away reached us, would we be immune? The answer is most likely not. Indeed, while having an immune system that protects us from a vast variety of pathogens sounds like an agreeable thing to have, the interaction between it and ET turns…

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