A vaccinated health worker who tested weak positive for Covid has since tested negative.

All Managed Isolation and Quarantine facilities operate as an alert level 4 environment.

Experts call for vigilance, as symptoms from any infections would start showing now.

Alert level 2 rules will be extended for 48 hours in Wellington, Covid Response Minister Chris Hipkins said.

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"Drug treatment in the community is 10 to 12 times more effective than in prisons."

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"We can't eradicate it, but we can turn [Covid] into something much less threatening."

Update comes after confirmation Sydney to Wellington traveller has Delta variant.

From today, residents in four Sydney suburbs are subject to stay-at-home orders.

A mother-of-one who weighed 143kg has gone on to lose half her body weight.

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The visitor to NZ from Sydney has been confirmed as having Delta variant by NSW Health.

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Some runners were clocking up 200km a week, and organisers had spent thousands.

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'Health referrals are a good thing because we want demand for drugs to decrease'.

There are no new cases of Covid-19 in the community today.

Of the infected traveller's 1752 contacts, 532 have so far returned a negative result.

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'The outcome could be a potentially fatal disease that's now preventable.'

'It's like a plague. If it's strong in one area then it begins to spread across.'

Wellington moved into alert level 2 at 6pm yesterday.

Key question remains if traveller had 'explosive' Delta variant.