A new case of H7N9 has been reported in Zhejiang province, Zhejiang health authorities announced on Tuesday.
The male patient, 35, surnamed Liu, first went to see a doctor in a rural clinic on October 8. He was being treated at a Shaoxing city hospital and remained in critical condition, according to a statement released by Zhejiang authorities.
Liu was the first in Zhejiang to have tested positive for the deadly virus since April, said health authorities.
The H7N9 bird flu virus was first reported in late March, with most cases confined to eastern China. More than 40 people have died in the latest outbreak.
Cases of H7N9 have dropped significantly in recent months.