So people have to decide based on past experience and immune status how much of a risk seems reasonable for them.

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Even those who attend weddings with significant others are not immune to snarky, intrusive questions about their relationship status.

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In particular, low-status individuals showed high levels of activity in genes associated with the production of various immune-related cells and chemical signalling factors, as well as those to do with inflammation (a general immune response that involves tissue swelling and increased immune-cell activity in the affected area).

ECONOMIST: Social status and health