May be...

 

Although the World Health Organization continues to classify Mu as a 'variant of interest' globally, the CDC lists Mu simply as a 'variant being monitored. ' The CDC counts 10 variants in the variant being monitored group.

 The lambda variant, has been spreading rapidly in South America, particularly in Peru where the earliest documented samples of the virus date from August 2020.

Infectivity can occur 1-3 days before the onset of symptoms. Infected persons can spread the disease even if they are pre-symptomatic or asymptomatic. Most commonly, the peak viral load in upper respiratory tract samples occurs close to the time of symptom onset and declines after the first week after symptoms begin.

COVID-19 reinfections are rare, but they do happen. Reinfections might become more common with time and as new COVID-19 variants arise.

The new Omicron variant may be just much ado about nothing. Just a thought.