More than 3.78 million Chinese people have been inoculated with the A/H1N1 flu vaccine as of Saturday, with no reports of serious adverse reaction, the Ministry of Health said Sunday.

The vaccination campaign has been launched across the country except in Chongqing Municipality and provinces of Anhui, Jiangxi and Sichuan, the ministry said.

About 33.4 million doses of vaccines have been approved for use as of Saturday, 26 million of which have been sent to all parts of the country, according to the ministry.

As of Saturday, more than 46,000 confirmed A/H1N1 flu cases have been reported on the Chinese mainland, among whom more than 90 cases were in serious condition, the ministry said.

As of 3 p.m. Friday, six people on the Chinese mainland had died of the flu, the ministry said earlier.

Vaccination was one of the effective ways to prevent flu spreading, but seasonal flu vaccines would not help protect people against the A/H1N1 flu, experts warned.