According to China's National Health Commission (NHC), a 41-year-old male in the eastern province of Jiangsu has been verified as the first human case of bird flu infection with the H10N3 strain.
The man, a Zhenjiang resident, was admitted to the hospital on April 28 after developing a fever and other symptoms, according to the NHC.
On May 28, he was diagnosed with the H10N3 avian influenza virus, according to the report, which did not specify how the man became infected with the virus.
The patient was stable and ready to leave the hospital. No other cases had been discovered through medical observation of his close contacts.
According to the NHC, H10N3 is a low pathogenic, or less severe, strain of the virus in poultry, and the risk of it spreading on a large scale is very low.
Claes said that analysing the virus's genetic data will be necessary to determine whether it resembles older viruses or is a novel mix of viruses.
In China, there are many different strains of avian influenza, and some of them sporadically infect people, usually those who work with poultry. Since the H7N9 strain killed around 300 people in 2016-2017, there have been no significant numbers of human infections with bird flu.
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According to the NHC, no other cases of H10N3 infection in humans have been reported around the world.
(Hallie Gu and Dominique Patton contributed reporting; Richard Pullin and Barbara Lewis edited the piece.)