It\'s difficult to work with people who have many sick leaves, but maybe some people really have a health problem?
Maybe it\'s not just simple flu? Did you ask your co-worker?
Some people have complicated medical problems and need to visit doctors for tests and follow ups frequently, they may not want to tell everyone about their illness.
I have seen people who are sick (really) an working and needs to see doctor frequently but missed many medical appointments and medicines because company / colleagues aren\'t understanding.
We have to think of people from different perspectives.
End of story, I won\'t start off another debate here.
(There are of course sometimes lazy people who want to get away from work but may not be true in every case).