The scientists say that, between December and February, there may have been as many as 1,000 coronavirus patients in Los Angeles.
The finding is published after only yesterday a British family came forward with a coroner’s report saying that their relative, 84-year-old Peter Attwood, died of coronavirus after catching it in December.
Mr Attwood’s death came two months before the first death was officially recorded in Britain and has been officially attributed to the disease, despite China not announcing its existence until after the grandfather had already caught it.