Parents should vaccinate children against whooping cough every three years
Canadian researchers found the current vaccine for pertussis was effective during the first three years.
But after that it becomes less and less effective and offers little protection by the seventh year of immunisation.
Researchers said children should be offered regular booster jabs to ensure they are offered the best possible protection.
Whooping cough is a highly contagious serious bacterial infection of the lungs and airways causing repeated coughing bouts that can last for two to three months or more.
It can lead to pneumonia and brain damage, particularly in young babies.
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