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. 1982 Aug;44(2):355–362. doi: 10.1128/aem.44.2.355-362.1982

Bacteria on closed-boll and commercially harvested cotton.

P D Millner, K E Ericson, P B Marsh
PMCID: PMC242019  PMID: 6751230

Abstract

The bacterial content of specially treated cottons used by other investigators to test human pulmonary responses to cotton dust was examined. Cotton from Lubbock, Tex. and Stoneville, Miss. were either (i) harvested by machine and handled as commercial bale cotton, (ii) harvested as closed bolls with bracts intact and opened under special conditions, (iii) harvested as closed bolls, with bracts being removed and opened under special conditions, or (iv) harvested by (stoneville only). Bacillus spp. were isolated from all samples and predominated in cotton from Stoneville. Enterobacter agglomerans was isolated from all but one sample, the Stoneville closed-boll bract-removed cotton, and predominated in Lubbock samples. Aerogenic and anaerogenic biogroups of E. agglomerans were isolated; only aerogenic strain b of E. agglomerans was present in samples from both locations. Klebsiella ozaenae and K. pneumoniae were isolated only from Lubbock samples. Cotton from Lubbock yielded 100 to 1,000 times more bacteria, both total and gram negative, than did comparably treated cotton from Stoneville. Thus, differences in growing and processing conditions at the two locations were associated with large differences in the bacterial content of the cotton, but harvesting green bolls and removing bracts had little effect. The bacterial content of Stoneville washed cotton, and it paralleled the differences reported (Boehlecke et al., Am. Rev. Respir, Dis. 123:152, 1981) in pulmonary function responses when subjects were exposed to dust (0.6 mg/m3) from these two cottons. Levels of gram-negative and total bacteria on all samples were comparable to those previously reported for field-weathered cottons from various locations throughout the world.

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Selected References

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