'Lambda variant, also known as lineage C.37, is a variant of SARS-CoV-2, the virus that causes COVID-19. It was first detected in Peru in August 2020. On 14 June 2021, the World Health Organization named it Lambda variant and designated it as a variant of interest. ’
That’s how far they are already, so Mu is the next.
CDC link said that the one death was “a male in his 60s, with a history of chronic diseases and wanhua district activities, a throat irritation, cough and other symptoms on May 21, a medical examination and hospitalization on May 27, a diagnosis on June 3 and a death on June 27”. So from first feeling ill until the positive test was 13 days, and he went downhill from there.