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"The good news is our immunisation rates for children are much higher than they used to be. On average, they're around 90 per cent. We'd like to get to 95per cent, but 90 per cent is very good coverage."
Dr de Wet said those most at risk of contracting whooping cough were children under a year old. The younger they were, the more at risk they were of severe illness, he said.
"The really important message for vaccinations for whooping cough is parents should not delay their immunisations, which start at six weeks."
Dr de Wet said it was also important for pregnant women to be immunised when they were between 28 weeks and 38 weeks pregnant.
"Their immunisation helps protect their newborn child."
The immunisation was also recommended for adults in contact with young children and babies.
Sonya Bateson