Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: A rise in cocaine injecting and homelessness are behind a 10-fold increase in HIV infection among drug users in Glasgow, research suggests.

Cocaine injecting and homelessness 'behind Glasgow HIV rise'