SUNDAY, May 24 (HealthDay News) -- U.S, health officials reported progress towards a viable H1N1 swine flu vaccine this week, with experts at the U.S. Centers for Disease Control and Prevention saying they had two promising candidate viruses for use in such a shot.

"Today CDC received, from one institution, a candidate vaccine virus," Dr. Anne Schuchat, the CDC's interim deputy director for science and public health program, said during a news conference on Friday.

The strain was created...


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