The death toll from the A/H1N1 flu pandemic have killed 337 people in 121 nations and the number of the total infected has exceeded 80,000, a top official of the World Health Organization (WHO) said on Thursday.

Most of the infected are young people and schools and homes are the places where people are most likely to be infected, WHO's Deputy Director-General Keiji Fukuda told a meeting on the A/H1N1 flu in Mexico's southeastern resort town of Cancun.

He said the virus is more similar to H5N1 avian flu rather than the seasonal flu and the future of the disease is uncertain due to the mutations that the virus could present, he added.

According to Fukuda, the existing anti-viral medication remains the most effective means of tackling the disease.

He also echoed WHO Director-General Margaret Chan's remarks that the transparency of information and solidarity among governments are essential to tackling the first pandemic of the 21st century.

The meeting has attracted ministers and health experts from 43 nations.

Source: Xinhua