Summary

Our gut microbiome is home to trillions of microbes, but they may not all be microscopic. Giant bacteria, which can reach a centimetre in length, are generally found in niche environments, such as mangroves and fish guts. But now, microbiologists have detected signs of DNA from Epulopiscium , one of the largest known types of bacteria, in human gut microbiomes from around the world. Bacteria are usually around 2 micrometres long, while giant ones are generally defined as being larger than 10 micrometres.

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