AARON ROSS THE Serum Institute of India plans to manufacture 20,000 to 30,000 doses of an experimental Ebola vaccine by the end of November for use in trials against an outbreak in Uganda, its developers and a company source said. The response to Uganda's outbreak has been blunted by the absence of a proven vaccine against the Sudan strain of the virus. There have been 54 confirmed cases and 19 deaths since last month and the first case in the capital, Kampala, was recorded last week. But health authorities believe the actual numbers could be higher. Vaccines against the more common Zaire…