The drug hydroxychloroquine, once touted by Donald Trump as a pandemic “game-changer,” should not be used to prevent Covid-19 and has no meaningful effect on patients already infected, a World Health Organization expert panel said.

Children and young people are far less likely than adults to get severe cases of Covid-19 infection, and death from the pandemic disease among children is exceptionally rare, according to published UK research.

Patients given the malaria drug touted by President Donald Trump as a potential treatment for COVID-19 did not improve significantly over those who did not, according to two new studies published in the medical journal BMJ .

Almost half of all European-registered clinical trials have breached EU rules by failing to report results, according to a published analysis.