Needless to say, these reports have created considerable alarm about the possibility of a new gay subculture that may amplify the spread of HIV and hepatitis C, and anecdotally, the large majority of gay men attending support services for drug users in London now report injecting. It asked the questions in both the section of the survey enquiring about sexual risk taking and in the section about drug use to ensure all relevant responses were captured. An extension of multivariable analysis that is used to model two or more outcomes at the same time. In a bacteria culture test, a sample of urine, blood, sputum or another substance is taken from the patient. The cells are put in a specific environment in a laboratory to encourage cell growth and to allow the specific type of bacteria to be identified.