The World Health Organization said on Monday that four additional human cases of avian influenza (H7N9) were reported by the National Health and Family Planning Commission of China.
Two cases were reported in Guangzhou City, Guangdong Province. The first patient is a woman 81 years of age who developed symptoms on March 26 and was admitted to the hospital on April 4. The second patient is a man 79 years of age who became sick and was admitted to the hospital on April 7n.
A 37 year-old man from Shantou City, Guangdong Province, became sick on April 3 and was admitted to the hospital on April 7.
A woman 71 years of age from Heyuan City, Guangdong Province, developed symptoms on April 1 and was admitted to the hospital on April 5.
All four patients had a history of exposure to live poultry and are currently in critical condition.
The Chinese government is continuing surveillance and enforcing control measures for avian flu. The WHO expects sporadic cases of the illness to continue appearing in affected and neighboring areas.
The H7N9 virus is not able to transmit easily among humans. Until the virus adapts itself for human-to-human transmission, the threat of international spread of H7N9 is low.