November 25, 2005

Panflu vaccine at least a year away

By Marie Frail

BEIJING (Reuters) - China's home-grown human bird flu
vaccine is at least a year away from hitting the market but
clinical tests on people have been approved by the government,
head of the research drug company said on Friday.

Development of the vaccine -- called Panflu -- started last
year after bird flu outbreaks in Thailand and Vietnam and
animal trials have already been completed, said Yin Weidong,
managing director of Sinovac Biotech.

Underscoring the urgency of the research, China this week
said that a second person had died of the deadly H5N1 strain of
the bird flu virus, and health officials expect there to be
more deaths as the pandemic in poultry continues to spread in
China. "It is not a virus that is spreading from human to
humans, so we are very optimistic," Yin told Reuters in an

H5N1 made its first known jump to humans in Hong Kong in
1997, killing six people. The virus resurfaced in late 2003 and
is known to have infected 130 people in several parts of Asia,
killing 68 of them. "It is not decided yet when the human
trials will begin. We just got approval on November 22 by the
State Food and Drug Administration and now we are adjusting our
research schedule according to the approval," Yin said.

Initial human testing on 100 volunteers will take 210 days
and then there will be a production cycle of 128 days before
the vaccine is ready for market, said Yin from his office near
the university district in northwest Beijing. "I can't say
specifically when we will start human trials, but we will begin
as soon as possible."


Experts say experimental vaccines for bird flu are unlikely
to be a good match for an H5N1 strain that may eventually
emerge in transmissible form among humans. Using current
technology it takes 6 months or more to make a new flu vaccine
and there is no way to predict what a pandemic strain might
look like.

As a measure of the importance the government attaches to
the company, which also makes ordinary influenza and hepatitis
vaccines, Premier Wen Jiabao visited Sinovac Biotech last week.

Pictures in the entrance of the facility, which is partly
government-funded, show a visit by President Hu Jintao as well.
The company also researched a vaccine for Severe Acute
Respiratory Syndrome, which surfaced in southern China in 2003,
spread to the rest of Asia and North America and killed
hundreds of people. Development stopped when the crisis abated,
though the firm is proud of its association with SARS. A red
banner hanging over the entrance to the laboratory reads: "We
have successfully conquered SARS and we are confident we can
conquer bird flu."

China, the world's largest poultry-producing nation, has
confirmed three cases of human bird flu. The third person, a
nine-year-old boy, recovered. His dead sister is a suspected
case. Yin said he was confident of success, though. "The
development of the human bird flu vaccine is pure influenza
vaccine research and it has less uncertain factors than SARS
research," he said. "The possibility of successful research is
greater than with the SARS vaccine."