The employees have to stay home and self-isolate while they are suspected of being infected with the coronavirus, including their family members.
The employees have to stay home and self-isolate while they are suspected of being infected with the coronavirus, including their family members.
(従業員は、家族を含め、コロナウイルスに感染している疑いがある間、家にいて自己隔離する必要があります。)
上記のような言い方でどうでしょうか?
suspect は「疑う」という動詞になります。
参考になれば幸いです。