Approximately half of the world’s population is infected with the gastric bacteriumHelicobacter pylori (H. pylori). While some cases of H. pylori infection can lead to gastric cancer, most infections remain either asymptomatic or can even be protective in esophageal cancer or asthma.
http://www.fredhutch.org/en/news/spotlight/imports/know-thy-helicobacter-pylori-with-ddpcr.html
Know thy Helicobacter pylori with ddPCR