CNN headline says: 'The number of confirmed swine flu cases across the globe kept rising Friday, but some signs of hope emerged in the battle against the worldwide outbreak. The World Health Organization said Friday that the number of confirmed cases stood at 367 worldwide, including 141 in the United States and 156 in Mexico. Thirteen countries have confirmed cases, the organization said.
Meanwhile, researchers worked to develop a vaccine for swine flu, which is also known as 2009 H1N1.
The Centers for Disease Control and Prevention hopes to have a vaccine to manufacturers within a month, said Michael Shaw, lab team leader for the H1N1 response at the CDC.
"We're doing the best we can as fast as we can," he said.
Yet it would take four to six months from the time the appropriate strain is identified before the first doses become available, said Dr. Marie-Paule Kieny, WHO director of the Initiative for Vaccine Research.
"Of course we would like to have a vaccine tomorrow. We would have wanted to have it yesterday," she said. "It's a long journey."
She said there is "no doubt" that a vaccine can be made "in a relatively short period of time."