off sick vs sick leave

[Majid72]

Hello

I ‘m wondering which one of the sentences is more common.

- My secretary is off sick following a hear attack.
- My secretary is on a sick leave following a hear attack.

Thank you.

[Mister Micawber]

.
Heart attack.

The first is more common; the second is better without the first 'a'.
.
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Native English teacher at Mister Micawber's