Seasonal airborne-Penicillium counts

Phil Geis jorge2 at earthlink.net
Wed Oct 22 19:39:30 EST 1997

Austin Reade wrote:
> Airborne mold spore counts in outside air in our region (Eastern Canada) are
> normally dominated by Cladosporium, Ulocladium and Alternaria, along
> with Epicoccum, non sporing isolates and low levels of other molds including
> Penicillium, Aspergillus, Scopulariopsis, etc.  Total mold counts range up to
> 2,000-3,000 cfu/m3 in summer to less than 100 in winter.
> This fall our lab has received air samples (RCS Biotest strips) from several
> widely separated areas with very high levels of Penicillium sp in the outside
> air samples (1,000-2,000 cfu/m3).  We don't maintain our clients' data in a
> form which allows easy retrospective analysis but I don't recall seeing such
> high levels of penicillia in outside samples in previous years.
> Is it likely that this reflects changing dominance of molds on the senescing
> leaves of deciduous trees?
> A pointer to published data would be appreciated.
> ----------------------------------- * ----------------------------------
> Austin Reade, Microbiologist      Phone:    (902) 424-8670
> Innovacorp                        Fax:      (902) 424-4679
> 101 Research Drive, PO Box 790    Internet: areade at nsrfc.ns.ca
> Dartmouth, NS, Canada  B2Y 3Z7

Is it possible that samples were taken or strips stored in a manner that
exposed it to a common source of contamination.  I recall a surprisingly
high Penicillium count from a marine mud sample being traced to a bowl
of contaminated fruit near the laboratory area on a crowded ship.

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