The team's purpose was to "learn about the experience of H7N9" in Shanghai, the authority said, adding that it was due to return late Friday.
And Japan's National Institute of Infectious Diseases will receive samples of the virus from Chinese authorities as soon as this month, CNN affiliate NHK reported. The institute is already analyzing genetic information from the virus in order to be ready to quickly produce vaccines, if needed, NHK said.
Other strains from the H7 virus family caused previous outbreaks in poultry in countries including the Netherlands, Britain, Canada, the United States and Mexico, Malik Peiris, a professor at Hong Kong University's School of Public Health, said earlier this week. Human infection was documented in all of those cases except the Mexican one.
The outbreak of the H7N7 strain in the Netherlands in 2003 infected 89 people, one of whom died, according to Peiris.
The better known H5N1 avian flu virus has infected more than 600 people since 2003, of which more than 370 have died, according to the World Health Organization.
In February, China reported two new human cases of H5N1 in the southern province of Guizhou, both of whom were in a critical condition, the WHO said.
A spike in H5N1 deaths, many of them children, has been reported in Cambodia, prompting concern among health authorities.