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Articles on Contact tracing

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New Zealand’s chief science advisor Dame Juliet Gerrard receiving her first vaccination dose. Hannah Peters/Getty Images

At least four in five New Zealanders will have to be vaccinated before border controls can be fully relaxed

New Zealand will have to vaccinate 80-85% to reach population immunity. Until then, a blanket border re-opening, even if only for vaccinated people, would pose a high risk of new outbreaks.
Sydney’s community outbreak of COVID-19 has been dominated by the delta variant. Bai Xuefei/Xinhua via Getty Images

Why New Zealand is more vulnerable to a new COVID-19 outbreak than ever before

New Zealand’s capital is on high alert after an Australian visitor tested positive on their return home. With less than 10% vaccinated, New Zealanders remain vulnerable to new outbreaks.
Exposure notification systems alert people when they’ve been exposed to the coronavirus but don’t record the information. AleksandarGeorgiev/E+ via Getty Images

How Apple and Google let your phone warn you if you’ve been exposed to the coronavirus while protecting your privacy

Bluetooth wireless communication makes it possible to track when people have been exposed to people infected with the coronavirus. The right cryptography scheme keeps alerts about exposures private.
Workers prepare to greet passengers at the COVID-19 testing centre in the international arrivals area at Pearson Airport in Toronto on Jan. 26, 2021. THE CANADIAN PRESS/Frank Gunn

Why Canada doesn’t know how many COVID-19 cases are linked to travel

Recently announced travel restrictions are intended to curb the spread of COVID-19 variants. However, we need to do a better job of tracking arrivals into the country.

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