Mathema said he would carefully consider the risks involved with including someone outside of a social bubble at a gathering.

\"I would want to know, what sort of risks are they introducing to me? What sort of risks am I introducing to them and their network?\" said Mathema, who stressed the importance of social distancing in those cases.

\"The level of risk one wants to carry goes beyond the individual. I think that's a point we keep on having to repeat,\" he added. \"It's really important for us as a society to think very hard about what kinds of risks we want to put ourselves, our families, our communities through.\"

What to know about the coronavirus:

Tune into ABC at 1 p.m. ET and ABC News Live at 4 p.m. ET every weekday for special coverage of the novel coronavirus with the full ABC News team, including the latest news, context and analysis.

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