Though most confirmed cases have meant pneumonia and difficulty breathing, Chinese officials have identified a 4yearold Beijing boy as a carrier of the virus: DNA tests revealed that he is infected but has no symptoms, according to a news report from the Xinhua News Agency.



The boy represents only the second confirmed case of the disease in the city. His lack of symptoms raises the possibility that more people may have contracted the virus without anyone being aware.



Thus far, only one family member of a flu victim, the husband of a 64yearold woman who died of H7N9, has been found to also have the ugg boots outlet virus, according to another Xinhua report. Chinese officials said no evidence exists that he caught it from his wife or that the virus is capable of sustaining persontoperson transmission.



In a risk assessment published April 13, the World Health Organization confirmed that the H7N9 virus has turned up in poultry and pigeons in some poultry markets. But the virus in the birds doesn't carry all the mutations that help it adapt to humans, so officials don't yet know if people caught the virus from the birds or from some other animal.



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A study published in Eurosurveillance April 11 suggests that the first man found to be infected with H7N9 (an 87yearold from Shanghai) carried a virus similar to one that infected a pigeon. Two other people who died of the flu share a virus similar to one in a chicken from a Shanghai market. Those findings agree with a New England Journal of Medicine study that suggests the virus may have moved from animals into humans twice (SN Online, 4/12/13).