Why is there such a range in the number of deaths from Covid -19 between countries? A study of the data across 21 industrialised countries reveals a wide discrepancy. Preparedness and the point at which countries went into lockdown were key factors says epidemiologist Jonny Pearson- Stuttard

Recurring illnesses which show up sometimes months after a Covid -19 infections are being more commonly reported. The Uk’s National Institute for Health research has launched a major initiative to better understand this long term effect of the disease, Candace Imison tells us more.

And another reported case of Covid 19 reinfection raises questions about widely held beliefs on immunity. Microbiologist Sarah Pitt helps us separate the science from the fiction.

We also take a look at a black hole as it swallows up a star or at least at what’s detectable. Katy Alexander has trained radio telescopes at this distant event.

(Image: Getty Images)

Presenter: Roland Pease