SHANGHAI, Nov 19 (Reuters) - China reported a slight decline in new COVID-19 cases on Saturday as numerous cities battled outbreaks, and as restaurants and other businesses in Beijing shut after authorities urged people to stay home over the weekend.Authorities have recently sought to ease the impact of their tough zero-COVID policy, which is battering the world's second-biggest economy and sowing frustration and anger as case numbers have risen to their highest since April.A major office complex in the nearby Dongcheng district said Chaoyang residents should not come to work from Monday and staffing levels would be reduced by 30%.Liu Xiaofeng, deputy director of Beijing's municipal Center for Disease Control and Prevention, told a news conference that case counts in each district of the capital continue to trend upward.The manufacturing hub of Zhengzhou reported 182 new symptomatic locally transmitted COVID infections and 1,385 asymptomatic cases, compared with 107 symptomatic and 1,556 asymptomatic cases a day before, according to government data."