it can swim through a 2.7 um filter, so it's probably not a
fungus. yeast is a small fungus, and a yeast cell is usually
about 5 um.
as far as I know there are no viruses that require strict
anaerobic conditions to stay alive (as far as a virus is
alive...) so I'd put my money on one of the zillions of
(facultative anaerobic) bacteria out there.
Rogier
rogier AT bio.vu.nl
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