illness和sickness可數嗎

例句：

In fifty-two years of working he had one week of sickness.

他在52年的工作時間裏曾生過1星期的病。

We strongly recommend insuring against sickness or injury.

我們強烈建議投傷病保險。

I recommend you get insurance against sickness and unemployment.

我建議你辦個疾病和失業保險。

Stress is often a factor in the development of long-term sickness.

心理壓力常常是形成長期病的一個因素。