Researchers have claimed only partial success this Thursday in the largest human trial of an avian flu vaccine.
They showed the vaccine is safe and generates what appears to be a protective immune response. But it works only half the time and only when given in a total dose that is 12 times the amount used in seasonal flu vaccine, study leader John Treanor of the University of Rochester says.

“Every journey starts with the first step,” Treanor says, saying researchers hope to use chemicals called adjuvants to boost the vaccine’s effectiveness.

Tags: bird flu vaccine, vaccine, avian flu vaccine