Immunity to Covid-19 could be lost in months, UK study suggests

People who have recovered from Covid-19 may lose their immunity to the disease within months, according to research suggesting the virus could reinfect people year after year, like common colds. Blood tests revealed that while 60% of people marshalled a “potent” antibody response at the height of their battle with the virus, only 17% retained the same potency three months later.

German study finds low Covid-19 infection rate in schools

Very few of 2,000 schoolchildren and teachers tested in the German state of Saxony showed antibodies to Covid-19, a study has found, suggesting schools may not play as big a role in spreading the virus as some had feared. The largest study conducted in Germany on schoolchildren and teachers included testing in schools where there were coronavirus outbreaks.

What happens when flu meets Covid-19?

The real unknown is what Covid-19 does around other viruses. Every autumn there is a predictable series of outbreaks of respiratory viruses. It starts with rhinovirus, the main cause of the common cold, which breaks out every September as young children go to school and swap mucus. As no parent needs to be told, children are to sniffles what mosquitoes are to malaria.

K number: what is the coronavirus metric that could be crucial as lockdown eases?

K sheds light on the variation behind R. “Some [infectious] people might generate a lot of secondary cases because of the event they attend, for example, and other people may not generate many secondary cases at all,” said Dr Adam Kucharski. “K is the statistical value that tells us how much variation there is in that distribution.”

Predictive power of mathematical modelling and the risk of a second wave

Neuroscientist Karl Friston, of University College London, builds mathematical models of human brain function. Lately, he’s been applying his modelling to Covid-19. He says, our approach, which borrows from physics and in particular the work of Richard Feynman, goes under the bonnet. It attempts to capture the mathematical structure of the phenomenon – in this case, the pandemic – and to understand the causes of what is observed.

Will Covid-19 mutate into a more dangerous virus?

As the coronavirus spreads around the world, there are concerns that it will mutate into a form that is more transmissible, more dangerous or both, potentially making the global health crisis even worse. What do we know about the way the virus is evolving?

'Weird as hell’: the Covid-19 patients who have symptoms for months

There is growing evidence that the virus causes a far greater array of symptoms than was previously understood. And that its effects can be agonisingly prolonged: in Garner’s case for more than seven weeks. The professor at the Liverpool School of Tropical Medicine says his experience of Covid-19 featured a new and disturbing symptom every day, akin to an “advent calendar”.