To contain coronavirus, the CDC emphasized how important it would be to avoid crowds, work from home and even self-quarantine.

In the only wealthy country in the world which does not require employers to give workers paid sick days, that guidance is difficult to follow.

At least three in 10 workers did not take time off from work when sick with the H1N1 swine flu in 2009, according to a paper by the Institute for Women’s Policy Research. The paper said this led up to seven million additional infections and may have extended the outbreak.

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