In Xiamen, a city in Fujian province also in the east, authorities ordered a halt to poultry sales from Thursday in the Siming district, after a 44-year-old man was diagnosed with H7N9 flu, state news agency Xinhua reported on Wednesday.
The patient was in hospital and was stable, Xinhua said then. The city has a population of about 3.5 million.
Hong Kong this week reported its first human bird flu infection for this season.
In Macau, health authorities will soon discharge a patient who contracted H7N9, following a quarantine period of about 10 days, said an official at the Macau Heath Bureau Services who only gave his surname Yang.
The patient, a man, had been in close contact with infected poultry, Yang told Reuters. He will be discharged on either Friday or Saturday.
Bird flu is most likely to strike in winter and spring.
Farmers have in recent years increased cleaning, animal detention techniques and built roofs to cover hen pens to prevent infection from wild birds, among other steps, in an effort to stop the disease.
In the past two months, more than 110,000 birds have been killed following bird flu outbreaks, according to the Ministry of Agriculture. They did not lead to human infection.
Authorities have not reported the culling of any birds this week.
The latest cases come as South Korea and Japan have ordered the killing of tens of millions of birds in the past month, fuelling fears of a regional spread.