Recieve Full Salary 143 days Absent All

I got shocked last night when my husband told me about his co worker,he told me that every week almost 4 of his co worker are ill.I ask him did that person are all the same in every week,he said NO.He told me about the laws here in Belgium,that if you have a paper from the doctor that state their how many days u gonna be absent from the work,you just only send it to your employee.Other of his co worker they go to work alternate,like 2 weeks ill and 2 weeks work...here in belgium if you are ill the employee will pay you full if you work on that month..If you are ill in more than a months the health care will pay you and it's gonna be little not like you gonna recieve a full salary...

Almost all people i think here in belgium do that,especially in the time of holiday seasons alot of worker become ill...