Should I Go To Doctor Again?

I've been going to the doctor for more than 4 times already on this month. First, my daughter was sick and then I went back again when my son was having high fever. It continued until the end of this month. I brought my kids to the doctors because they had cough and fever. I think the virus is just turning around in this house. I did clean the house properly but my kids get sick so often on this month. And now, my son have high fever again. What's going on?