Covid-19 has been detected in a wastewater sample in Napier taken on December 15.
The Ministry of Health say it could be due to recently recovered cases, transient visitors or undetected cases of Covid-19 in the community.
Health officials are asking anyone in the Hawke's Bay region with Covid-19 symptoms, no matter how mild, to get tested.
There were 76 cases of Covid-19 recorded in the community on Friday.
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