Thirteen more crew members have tested positive for Covid-19 in managed isolation after coming off a ship docked at Wellington - and another ship has docked at Port Taranaki with crew suffering "flu-like" symptoms.

The Ministry of Health confirmed new cases aboard the Viking Bay in Wellington on Tuesday morning.

Two members of the crew tested positive last week. At least one has the highly infectious Delta variant.

The 15 crew members are now being transferred to a quarantine facility in Wellington.

Auckland University professor Des Gorman joined Nick Mills on Wellington Mornings.

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