No new, more transmittable coronavirus subvariants have been found in Shanghai, the Shanghai Health Commission has stated.The World Health Organizations has drawn attention to new sub-variants of COVID-19 beyond the BA.2 mutation, such as the BA.4 and BA.5, and expressed concern over the possibility of a new worldwide flare-up.The dominant subvariants of the city's resurgence remains the Omicron BA.2 and BA.2.2, as Shanghai continues its gene sequencing of locally transmitted infections, said Zhao Dandan, deputy director of the commission.