Gastrointestinal diseases caused by Helicobacter pylori include chronic gastritis, duodenal ulcers, and gastric cancer. Individuals who are HIV positive are known to have a high incidence of gastrointestinal disease, however, studies on the seroprevelance of antibodies to H. pylori in HIV infected individuals in developed countries have generally shown that this group is lower in seroprevelance than corresponding HIV negative controls.  ref: http://gateway.nlm.nih.gov/MeetingAbstracts/ma?f=102235267.html

The reason for have a hiv test is If you have never had unprotected sex, shared drug injecting equipment, or been exposed to HIV during a medical procedure or at work, then there is probably very little likelihood of you having HIV, and no real reason for you to take an HIV test. If there is a possibility that you have been exposed to HIV, then a test is always the best option. Many people are very frightened of taking an HIV test in case they test positive. This can mean they spend many months, sometimes even years, worrying about the possibility of having HIV, often unnecessarily. In almost every case, it is better to know your status than not to know: If you are diagnosed as HIV negative, your mind will instantly be put at rest and you can stop worrying and get on with your life.