They are more likely to be unemployed, unwell, in prison, or supported by the state.

BBC: Education & Family

As a result prisoners who are acutely unwell can't be transferred because beds are blocked.

BBC: Patients spend 'too long in secure mental health units'

The upshot is that the programme of culling that the government embarked on was probably more aggressive than it needed to be, and that a system of quick detection and isolation of unwell animals might have been sufficient to keep the disease in check.

ECONOMIST: Foot-and-mouth disease

When the supercomputer is finished, one future result could be that doctors might take swabs from the inside of the mouths of people feeling unwell and put such samples into a computer.

CNN: Big Blue's SMASHing Blue Gene