Guangzhou, Rabi'II 16, 1436, Feb 5, 2015, SPA -- The number of H7N9 human cases in south China's Guangdong Province reached 34 since the start of the year with one more case reported, local health authorities said on Thursday. A 51-year-old man surnamed Jiang in Guangdong's Shenzhen city was confirmed infected with the bird flu on Wednesday, the provincial health and family planning commission said in a statement. The man is in critical condition. Health experts have warned Guangdong, which borders Hong Kong, has entered the high-incidence period for bird flu, which usually crops up in winter and spring seasons, Xinhua reported. A series of human infection reports and the belief that most cases come from exposure to infected poultry have led to the culling of thousands of chickens in Guangdong and Hong Kong this year. Several cities in Guangdong have also taken measures to restrict live poultry trade to curb the spread of the disease, raising concerns about the impact on the industry. In addition to Guangdong, Shanghai, Fujian, Jiangxi and Zhejiang in east China have all reported human cases of H7N9 this winter. H7N9 is a bird flu strain first reported to have infected humans in March 2013. --SPA 19:42 LOCAL TIME 16:42 GMT www.spa.gov.sa/w