Doesn't sound (I hope) like a new round...
China says no 'unusual or novel pathogens' after WHO queries respiratory outbreaks (bbc.com) (https://www.bbc.com/news/world-asia-china-67505218)
QuoteProf Paul Hunter, of the University of East Anglia (UEA), said at present there was too little information to make a definitive diagnosis of what was causing the infections.
He added: "Overall, this does not sound to me like an epidemic due to a novel [new] virus. If it was, I would expect to see many more infections in adults. The few infections reported in adults suggest existing immunity from a prior exposure."
The US had similar surges in general respiratory illness back in August and September and other countries have also experienced surges this year. China had had a late resurgence of Covid and were later than a lot of countries in finally easing restrictions again, so they're probably just now getting a surge similarly to what other countries already experienced.
I find the mystery canine respiratory illness to be more concerning.