Bacteria are omnipresent – in the water, the air and the soil, as well as in plants, animals and even people. We tend to think of bacteria as pathogenic, causing disease. We associate them with intestinal upsets and throat infections, pneumonia and blood poisoning. However, the great majority of bacteria are really useful – they play a role in our digestion, clean up waste water in sewage treatment plants, produce yoghurt and cheese from mil
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