SHANGHAI: US public health experts said developing a vaccine for the H7N9 strain of bird flu could take “many months”, as China seeks to control an outbreak which had killed 11 people by yesterday.
Chinese authorities have confirmed 40 human cases of H7N9 avian influenza since announcing nearly two weeks ago that they had found the strain in humans for the first time.
Writing in the New England Journal of Medicine, Timothy Uyeki and Nancy Cox of the US Centres for Disease Control and Prevention (CDC) said worldwide efforts to develop a vaccine had started, but it would take time.
“Even if new vaccine manufacturing technologies... are utilised, the process from vaccine development to availability will probably take many months,” said the article posted on the journal’s website on Thursday.
China said this week it expects to have a vaccine ready in seven months.
Chinese health officials say they do not know exactly how the virus is spreading, but it is believed to be crossing to humans from birds.
The journal article said the outbreak was a “seminal event” that raised global concerns and it urged China to enhance surveillance. “It might herald sporadic human infections from an animal source... or it might signal the start of an influenza pandemic,” the article said.
Experts fear the prospect of such viruses mutating into a form easily transmissible between humans, which has the potential to trigger a pandemic. The World Health Organisation (WHO) said on Monday that there was no evidence of human-to-human transmission.
Shanghai, which has the majority of confirmed cases, was the first to halt trading in live poultry and cull birds last week, followed by other cities in eastern China — the site of the outbreak.
In Nanjing, a woman cut an official with a broken bottle as she tried to protect her chickens after the city barred residents from raising poultry at home and ordered them to cull birds, China News Service said yesterday.
“I want to get bird flu, so I can infect you,” the emotional woman told urban management officials seeking to kill her birds.
The Food and Agriculture Organisation (FAO) on Thursday expressed worry over the possible spread of H7N9 to China’s neighbours. “There is a possibility that if inadvertently or advertently somebody moves infected poultry across the border from one country to another you can have a spread of the virus,” said Subhash Morzaria, Asia regional manager for the FAO’s emergency centre for animal diseases.
AFP
