Hi All.

    Thanks for the answers to my query. The only thing is, both the main
factors mentioned so far - cell size and colony density - also applied in the
UK, and we didn't have an epidemic. It's possible, of course, that acarine
disease may have reduced colony density here before another factor - such as
cell size increases - came into play. When did AFB become such a problem in
the States?

Regards,

Robert Brenchley

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Birmingham, UK.