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There are fewer than 100 species of bacteria that cause infectious diseases in humans
Islands are where you go if you want to find life at its most outlandish, gaudy, and superlative. Their isolation, restricted boundaries, and constrained size allow evolution to go to town. The patterns of biology resolve into sharper focus more readily than they would do on the extensive, contiguous mainland.
Some species are common, but none is everywhere. If there is a core, it exists at the level of functions,not organisms. There are certain jobs, like digesting a certain nutrient or carrying out a specific metabolic trick, that are always filled by somemicrobe – just not always the same one
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