Anna Gibson and her daughter Mackenzie represent the cold hard reality of the immunisation campaign.

Anna Gibson and her daughter Mackenzie.

Along with her husband, Anna wasn't opposed to immunisation, but their story underlines why ignoring the campaign catch cry of 'on time every time” can have serious consequences.

Little Mackenzie developed whooping cough - a distressing but very preventable disease.

Click on the video above to hear their story.