Contact tracing

The health secretary will have to stay at home until Sunday.
Announced on the eve of the Christmas break, schools have been left hanging as they wait for the details on the education secretary's plan.
Here's what we can learn from contact tracers in the US on which social spaces have the highest risk.
The under-fire service finally hit its own 80% target for the first time in more than six months last week.
Pupils will also be tested daily if they have been in close contact with a positive case, in a move Gavin Williamson called a "milestone".
"Game changer" proposal from Test and Trace service will cut quarantine from 14 days to zero.
Under-fire service finally exceeds the 80% target that experts says is needed to make the system viable
Under-fire service abandons attempts to reach young people whose parents have already been spoken to.
Tory peer also says it is “impossible” to say if she would ever apply for NHS chief executive job.
The latest cluster of infections in South Australia has been linked to a returned traveller from the UK.