广州市疾控中心副主任张周斌：尚未出现感染来源不明的本地病例

Core Viewpoint - Guangzhou is experiencing a recent peak in COVID-19 cases, with 12 and 4 new asymptomatic infections reported in the last two days, but the situation should be viewed scientifically and objectively [1] Group 1: Infection Sources and Control Measures - The majority of new infections are linked to close contacts and secondary contacts, with no unidentified local cases reported [1] - Enhanced contact tracing and comprehensive nucleic acid testing in the Liwan District have been effective in quickly identifying potential infections and controlling the spread of the virus [1] - The increase in reported cases is primarily due to intensified efforts in contact tracing and testing [1] Group 2: Testing Statistics - As of May 31, a total of 1.2828 million nucleic acid samples have been collected in the Haizhu District, achieving a completion rate of 69.3% [1] - Out of the samples tested, 356,200 have been completed, all returning negative results [1]