According to the World Health Organization, the number of deaths in China due to the H7N9 bird flu virus has risen to 20, increasing the number of reported cases to 102, CNN reported.
70 of the infected people are still in the hospital while 12 have been discharged, Reuters said. Five of the most recently reported cases were in Zhejiang province and one was in Shanghai, Reuters reported.
The WHO's China representative, Michael O'Leary, issued data on Friday showing that half of the patients analyzed had had no known contact with poultry, the most obvious potential source, but he said it appeared human-to-human transmission was rare.
Data released on Friday by the WHO showed that half of the patients had had no known contact with poultry, Routers said. Although contact with poultry is the most apparent way to contract the virus, the WHO said there is still no evidence of human-to-human transmission, CNN reported.
"Until the source of infection has been identified, it is expected that there will be further cases of human infection with the virus in China," the WHO said in a statement.
China announced the first case of the H7N9 virus in humans only three weeks ago, CNN said.