A positive stomach test for H. pylori also means that you are infected with H. pylori, which can be contagious. H. pylori is an infectious bacterium that mainly resides in the human stomach, and once infected, it can be transmitted through several ways, and H. pylori infection has a certain degree of family aggregation. The transmission of H. pylori can be divided into the following three main ways: First, oral-oral transmission, especially parents often chew food and then feed it to their children, intimate behaviors such as kissing between husband and wife couples, and adults blowing on food to cool down the temperature for children to eat and so on, all of which may spread H. pylori. Second, fecal-oral transmission, such as fecal matter through the water stream or in places such as hand-washing sinks may also be transmitted. Therefore, in order to prevent H. pylori infection, it is important to have regular checkups and to eliminate the above behaviors that can cause transmission.