Newfoundland and Labrador Health Services says 151 cases of whooping cough have been reported throughout the eastern region.
The health authority first reported an outbreak of the highly contagious respiratory illness, which is also known as pertussis, in early May.
At that time, they confirmed more than 40 cases since February, which has almost tripled since then.
The age range of the cases is one month old to 89 years. Over half of the cases have been reported in kids between the ages of 10 and 14.
The health agency cautions that while cases can be mild, the risk is greater in infants and pregnant women in their third trimester.
They say it is important to control the spread of the illness and for people to follow public health recommendations around isolation, testing and prevention.
The health authority is launching a social media campaign, #LoveAndProtection, to raise awareness of immunization against the illness.
More information about whooping cough, including symptoms and vaccination guidelines, can be found online.
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