What are microbiomes? Both inside and out, our bodies have a host of smaller bodies. While bacteria are the biggest players, we also deal with single-celled organisms known as archaea, as well as fungi, viruses and other viral infections - including viruses that attack viruses. Collectively these are called human microbiota. Your body microbiome all types of your micobiota contain, however, statistically both of these terms are used in the same way. Sit down, aren't the germs becoming dangerous? There is little to see: some are viral, but some are harmful when they get in the wrong place or go up in numbers, and some are very useful for the body - such as helping to reduce the list of sugars found in human breast milk. "Those sugars are not broken by a baby," said Prof John Cryan...

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