MICROBIOME NEWS: Study finds evidence of no common blood microbes in healthy humans. “In recent decades this paradigm has been challenged by speculation that the blood could host a community of microbes. Here, we have confirmed this is not the case, as most people’s blood does not contain microbes, and the microbial species found in some people’s blood varied substantially between individuals. . . . After accounting for contamination that is rife in microbiome investigations, the team found that microbes were only rarely and sporadically detected in blood, instead of existing as stable communities. Among their sample of 9,770 people, 84% of people did not have any microbes in their blood sample, and less than 5% of people shared the same species. The scientists also found evidence that some bacteria in the blood of healthy individuals might be replicating and most of these bacteria are typically found in the human gut, oral, or skin microbiomes. Their findings suggest that microbes do occasionally enter the bloodstream from other body sites without causing disease, but there is no core set of species colonizing the blood of healthy individuals.”