I would agree with what others have posted. I have been accepted to the MPH program at the U of T. Although my GPA is not the greatest, I have quite a bit of research and volunteer experience in public health, but next to no employment experience in the area. I think just being involved in the field regardless of whether it is in the form of employment, volunteering, etc. is extremely valuable. I also think a lot of consideration is placed onto the personal statement or statement of intent, as long as you can show how what you have done will help you and where you want to go with the degree in public health, you should be good!