The number of newly diagnosed HIV and AIDS cases among gay and bisexual men grew 11% in the four-year period ending in 2003, raising fears of a new outbreak of the disease in a group experts said had become increasingly casual about taking protective measures. The increase was offset by a decline in new cases among intravenous drug users, so the overall rate increased by 1% over the same period, according to new data from the Centers for Disease Control and Prevention released Wednesday on World AIDS Day. The CDC estimates that about 40,000 new HIV infections occur each year...