Grassley says he is worried about wasting tax dollars. The United States still has 71 million doses of H1N1 swine flu vaccine that have not been used, but it is not yet time to throw them out, the federal government said on Monday. States and other providers should hang on to the vaccine and continue to offer them to people until drug companies can start distributing seasonal vaccine for the coming influenza season in the autumn, said Health and Human Services Department spokesman Bill Hall. Senator Chuck Grassley, the ranking Republican on the Senate Finance committee, released a letter on...