A Russian national had died from A/H1N1 flu in Beijing after medical treatment failed, local health authorities said Tuesday.

The 32-year-old man, whose name was not given, died Monday afternoon. He arrived in Beijing from Russia on Oct. 28 by air and went to the Ditan Hospital on Sunday with severe breathing difficulties and other symptoms, according to Beijing Municipal Health Bureau.

He was tested positive for the A/H1N1 flu virus on Monday.

In a separate case, a 60-year-old man in Ningbo city of eastern China's Zhejiang Province died Tuesday, two days after his A/H1N1 flu was cured.

The man, whose name was also not given, was admitted by the Ningbo Lihuili Hospital on Oct. 18 for A/H1N1 flu. He tested negative for the virus on Sunday, but died two days later from multiple organ failure.

The patient had a history of high blood pressure and a lung disease for more than three years, according to the hospital.

Seven Chinese have died of the A/H1N1 flu on the mainland as of Monday. The Chinese mainland had reported 48,748 cases of the A/H1N1 influenza, of whom 118 were in critical conditions.

The country has been providing free A/H1N1 vaccines to service personnel of the People's Liberation Army and armed police forces, police, medical staff, teachers, students, people working at key public service posts, and people with chronic or cardiovascular diseases, in order to battle the quickly-spreading disease.

More than four million people have been inoculated with A/H1N1 vaccines by Tuesday, said Liang Xiaofeng, director in charge of vaccination with the Chinese Center for Disease Control and Prevention, on Tuesday.

About 300 people were reported to have adverse drug reactions (ADR), Liang said, adding that "ADR cases related to the A/H1N1 flu vaccines are very few."

However, Liang acknowledged that China's monitoring network for ADR was far from perfect and China is working with the World Health Organization to improve the network.

"In some cases when patients suffered from minor fevers and pains, their symptoms were not reported," he said.

He urged people who have already received the vaccines to report to the authorities when they develop such symptons.