Science commentator Dr Siouxsie Wiles joins Kathryn with an update on the new BA.4 and BA.5 variants of Omicron which appear to be behind a new wave of Covid cases in South Africa. The longest-ever recorded case of Covid infection is 505 days - that's not long Covid, but a chronic infection. And researchers have found a way to use smell to make virtual reality more...real.
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