| US wants ingredient in swine flu vaccine by May (AP) |
AP – U.S. scientists hope to have a key ingredient for a swine flu vaccine ready in early May, but are finding that the novel virus grows slowly in eggs � the chief way flu vaccines are made. |
| US wants ingredient in swine flu vaccine by May (AP) |
AP – U.S. scientists hope to have a key ingredient for a swine flu vaccine ready in early May, but are finding that the novel virus grows slowly in eggs � the chief way flu vaccines are made. |