This looks like good news, but watch for the symmetric study showing the contagiousness of gloom, with the implicit prescription of socially isolating the already socially isolated.

The idea of concentration camps was simply to concentrate undesirable elements and prevent them from contaminating the others. Will it be a matter of public health to set up concentration camps for the mentally ill? The standard for commitment is that a person is a "danger to himself or to others", and these epidemiological studies will, in fact, show that a bad mood is a danger to others.