‘Giant’ bacteria and giant virus
It is commonly
accepted that c. 80% of the
bacterial species found by molecular tools in the human gut are uncultured or
even unculturable
The typical diameter
of the isolated bacteria ranged from 0.5 to 1.5 μm
the largest isolated
bacterium, Microvirga massiliensis,
reached 2.28 μm according to transmission electron microscopy, and was also
shown to possess the largest genome (9.35 Mb) of any bacterium previously
obtained from a human sample
The giant (194 nm in
diameter) Senegalvirus isolated by amoebal co-culture is the first giant virus
ever isolated from the human gut.
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