AstraZeneca’s swine flu research is continuing to combat the mutating forms of the swine flu virus. AstraZeneca’s continuing efforts to produce and distribute the first swine flu vaccine may force it to join venture with top biotech companies participating in the swine flu research. Swine stocks to watch: AVI Biopharma (AVII), Quidel Corporation (QDEL), Novavax (NVAX), BioCryst Pharmaceuticals (BCRX) and Dynavax Technologies (DVAX).