The Ministry of Health confirmed an eight year-old girl from southwest China's Sichuan province has been infected with the H5N1 bird flu virus. She was admitted to a local hospital showing symptoms of fever and pneumonia on April 16 The girl, who remains in hospital, is the mainland's second human case this month and comes a day after a top WHO official warned the world not to tire of fighting the virus. Investigators said poultry had died in the patient's house before she caught the disease. The diagnosis brings China's laboratory-confirmed cases to 18, 12 of which had been fatal.