Shanghai will further enhance its nucleic acid testing capability with more accurate screening and higher efficiency as a key strategy to curb the ongoing COVID-19 resurgence.The city will continue its "\\;grid screening"\\; on a smaller and more accurate scale in key areas based on the results of the previous massive screening, according to Wu Jinglei, director of the Shanghai Health Commission.The city's screening strategy is in accordance with the latest COVID-19 polymerase chain reaction testing guideline released by the National Health Commission, which requires more accurate regional screening rather than citywide testing, he told a press briefing on Thursday.