More than a million Americans are living with HIV, the virus that causes AIDS. About a quarter of them are women, and in St. Louis and throughout the country, African-American women are disproportionately affected.
Washington University microbiologist Dr. Jeffrey Gordon says his team then transplanted the bacterial communities into previously germ-free mice, to see how the lab-grown bacteria would respond to a human diet.
Ameren Missouri is asking a federal judge to dismiss a lawsuit filed against the company by the US Environmental Protection Agency.
The suit filed in January alleges that Ameren violated the Clean Air Act by making multi-million-dollar modifications to its coal-fired power plant in Festus without installing required pollution controls and obtaining the necessary permits.