Guardian Science Weekly

How come some people haven’t had Covid yet?

Loading player...
Although several countries around the world continue to have high rates of Covid-19 infections, including the UK and US, many of their citizens are yet to be infected with the Sars-Cov-2 virus. This includes countless individuals who have knowingly been exposed, often multiple times, but have still never had a positive test. Madeleine Finlay speaks to Linda Geddes about how scientists are trying to solve the mystery of why some people seemingly don’t catch Covid, and what could be behind this phenomenon. Help support our independent journalism at theguardian.com/sciencepod
10 Mar 2022 English United Kingdom Science · Nature

Other recent episodes

Revisited: The surprising science of dreams and nightmares

In this episode from January 2026, Ian Sample puts listeners’ questions about dreams and nightmares to Dr Michelle Carr, the director of the Dream Engineering Laboratory in Montreal’s Centre for Advanced Research in Sleep Medicine, and the author of the book Into the Dream Lab. They look at why we…
28 Jul 22 min

Revisited: A Scottish tea mystery, episode three – a bag for life

Science correspondent Nicola Davis investigates the strange story of Tam O’Braan and his attempts to grow tea in Scotland. In episode three of this mini-series first broadcast in October 2025, all of O’Braan’s lies come to a head and it is revealed where he was sourcing the tea being supplied…
23 Jul 20 min

Revisited: A Scottish tea mystery, episode two – the list

Science correspondent Nicola Davis investigates the strange story of Tam O’Braan and his attempts to grow tea in Scotland. In episode two of this mini-series first broadcast in October 2025, Nicola hears how O’Braan’s network of Scottish tea growers began to have suspicions about exactly what he was selling and…
22 Jul 23 min

Revisited: A Scottish tea mystery, episode one – green shoots

Science correspondent Nicola Davis investigates the strange story of Tam O’Braan and his attempts to grow tea in Scotland. In episode one of this mini-series first broadcast in October 2025, Nicola looks back on her first meeting with O’Braan while working on a feature about tea plantations in the UK…
21 Jul 22 min

Can a world-first gene therapy reverse ageing?

The first person has been treated with a highly anticipated new gene therapy that aims to turn back the clock on ageing cells. The trial is aimed at retinal cells, with the hope that encouraging them to behave as if they were young again could improve sight in the affected…
16 Jul 18 min
All episodes