Chinese authorities are pushing out new vaccines to combat evolving XBB coronavirus variants
Two new vaccinations for XBB omicron subvariants have been given preliminary approval
Three to four other vaccines are expected to receive approval soon
The new wave may be the largest since China's zero-Covid strategy was abandoned
China claims the current wave will be less severe but experts believe a vigorous vaccination booster program is necessary
Despite concerns, restrictions from the zero-Covid era have not been reinstated