By Ian Hall in The Conversation.
When we’re born, our lungs are thought to be sterile. But from the moment we take our first breath, our pristine lungs are exposed to all the bugs that are in the air. It has become clear in the last 10 years that the lungs rapidly acquire a population of many different microorganisms (mostly bacteria and viruses) that colonise the lungs and remain with us for the rest of our lives. This population of bugs is called the lung microbiome.
We now know more about the lung microbiome thanks to genetics. In the past, identifying the types of bugs present in the lungs depended on being able to grow them in a laboratory, and for many types of bug this was difficult. The big change that happened recently is our ability to recognise both the different bug species, and their relative abundance, by using DNA sequencing. This can be done either from a sample taken from the lungs or from sputum (the mucus we cough up when we have an infection).
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