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Joan Stephenson, PhD

JAMA. 2009;301(23):2432.

	Since this article does not have an abstract, we have provided the first 104 words of the full text and any section headings.

Vaccine makers will not be ready to begin large-scale production of a vaccine for H1N1 influenza—the so-called swine flu—until mid-July at the earliest, according to a report released on May 18 by an advisory group to the World Health Organization (http://www.who.int/csr/resources/publications/swineflu/TC_report_2009_05_14.pdf).

The advisory group noted that candidate vaccine strains will probably become available at the end of May 2009, but that another 1 to 2 weeks might be needed for studies of attenuation characteristics in animal models. Manufacturers would then need to isolate rapid-growing strains to help ensure high yields, a process that typically takes 1 to 2 months.

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