der Krankenstand Anglais:

on sick leave

He was away for a fortnight on sick leave.

I've been on sick leave.

The sick leave doesn't exist and the employees are coerced into working through illness

She is on sick leave.

He is away on sick leave

An employee is entitled to e.g. paid vacation, sick leave, maternity leave, maternity pay.

He's on sick leave until the end of the month.

You should take a sick leave if you came down with the flu

The employees use a sick leave illegally.

If stress levels get too high, many people get overstressed and take sick leave.