The canal hosts high levels of pathogens, many of which are harmful to humans. The 1974 report by New York City Community College microbiologists found that the water contained typhoid, cholera, dysentery, and tuberculosis. Additionally, a 2003 report of the New York Harbor showed that the Gowanus Canal had the highest level of pathogens of any location in the entire harbor. Microbiologist Nasreen Haque and her classes from the City University of New York have also tested water from the Gowanus. In 2007–2008, Haque's classes reported finding "every kind of imaginable pathogen," including those that cause gonorrhea. However, in 2010, students from City Tech found lower levels of "Escherichia coli" than they had expected.