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Chapter 40 : Is use of Potting Mix Associated with Infection? Results from a Case Control Study in South Australia

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Is use of Potting Mix Associated with Infection? Results from a Case Control Study in South Australia, Page 1 of 2

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Abstract:

A case control study was performed in South Australia to determine if infection was associated with recent handling of commercial potting mix and to examine possible modes of transmission. Recent use of potting mix was associated with illness (odds ratio [OR] 4.74; 95% confidence interval [95% CI], 1.65 to 13.55; P=0.004) in bivariate analysis. This chapter suggests there are other factors within the gardening environment, as well as intrinsic and behavioral host factors, that are better predictors of infection than recent use of potting mix. An association between illness and proximity to dripping, hanging pots supports inhalation of contaminated aerosols produced during watering as a possible mode of transmission. Another possible mode of transmission is ingestion of organisms via contaminated hands, which is supported by the association between illness and eating or drinking after gardening before washing hands. Further information on risk factors for infection that explores the interface between potting mix, other gardening exposures, and behaviors while gardening need to be addressed in a larger study. Long-term smokers and possibly people with preexisting medical conditions such as respiratory and cardiac illness should be warned about their increased risk of infection. Raising people’s awareness of a possible health risk when using potting mix should continue in order to protect against infection.

Citation: O’Connor B, Carman J, Eckert K, Tucker G. 2006. Is use of Potting Mix Associated with Infection? Results from a Case Control Study in South Australia, p 149-151. In Cianciotto N, Kwaik Y, Edelstein P, Fields B, Geary D, Harrison T, Joseph C, Ratcliff R, Stout J, Swanson M (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555815660.ch40

Key Concept Ranking

Legionella longbeachae
0.5972222
Incubation Period
0.52577484
Respiratory Diseases
0.42405874
0.5972222
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References

/content/book/10.1128/9781555815660.ch40
1. Cameron, S.,, D. Roder,, C. Walker, and, J. Feldheim. 1991. Epidemiological characteristics of Legionella infection in South Australia: implications for disease control. Aust. N. Z. J. Med. 21:6570.
2. Edelstein, P. H.,, N. P. Cianciotto. 2005. Legionella, p. 27112724, In G. Mandell,, J. Bennett,, R. Dolin (ed.). Principles and Practice of Infectious Diseases. Part III. Infectious Diseases and their Etio-logic Agents. Philadelphia Churchill Livingstone.
3. Miller, M.,, P. Roche,, K. Yohannes,, J. Spencer,, M. Bartlett,, J. Brotherton,, J. Hutchinson,, M. Kirk,, A. McDonald, and, C. Vadjic. 2005. Australia’s notifiable disease status, 2003 Annual Report of the National Notifiable Diseases Surveillance System. Communicable Dis. Intell. 29:176.

Tables

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TABLE 1

Multivariate analysis

Citation: O’Connor B, Carman J, Eckert K, Tucker G. 2006. Is use of Potting Mix Associated with Infection? Results from a Case Control Study in South Australia, p 149-151. In Cianciotto N, Kwaik Y, Edelstein P, Fields B, Geary D, Harrison T, Joseph C, Ratcliff R, Stout J, Swanson M (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555815660.ch40

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