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Please use this identifier to cite or link to this item: http://hdl.handle.net/2075/2863

Title: Recreational exposure to low concentrations of microcystins during an algal bloom in a small lake.
Authors: Backer, Lorraine C.
Carmichael, Wayne
Kirkpatrick, Barbara A.
...[et al].
Keywords: aerosol exposure
blue-green algae
cyanobacteria
microcystins
water-borne exposures
Microcystis aeruginosa
Issue Date: 2008
Publisher: MDPI Publishing, www.mdpi.org/marinedrugs
Citation: Backer, L. C., W. Carmichael, B. A. Kirkpatrick, C. Williams, M. Irvin, Y. Zhou, T. H. Johnson, K. Nierenberg, V. R. Hill, S. M. Kieszak, and Y. S. Cheng. 2008. Recreational exposure to low concentrations of microcystins during an algal bloom in a small lake. Marine Drugs 6(2): 389-406.
Series/Report no.: Mote Contribution ; No. 872
Abstract: We measured microcystins in blood from people at risk for swallowing water or inhaling spray while swimming, water skiing, jet skiing, or boating during an algal bloom. We monitored water samples from a small lake as a Microcystis aeruginosa bloom developed. We recruited 97 people planning recreational activities in that lake and seven others who volunteered to recreate in a nearby bloom-free lake. We conducted our field study within a week of finding a 10-μg/L microcystin concentration. We analyzed water, air, and human blood samples for water quality, potential human pathogens, algal taxonomy, and microcystin concentrations. We interviewed study participants for demographic and current health symptom information. Water samples were assayed for potential respiratory viruses (adenoviruses and enteroviruses), but none were detected. We did find low concentrations of Escherichia coli, indicating fecal contamination. We found low levels of microcystins (2 μg/L to 5 μg/L) in the water and (<0.1 ng/m3) in the aerosol samples. Blood levels of microcystins for all participants were below the limit of detection(0.147μg/L). Given this low exposure level, study participants reported no symptom increases following recreational exposure to microcystins. This is the first study to report that water-based recreational activities can expose people to very low concentrations of aerosol-borne microcystins; we recently conducted another field study to assess exposures to higher concentrations of these algal toxins.
Description: Marine Drugs 6(2): 389-406. http://www.mdpi.com/1660-3397/6/2/389/
URI: http://hdl.handle.net/2075/2863
ISSN: 1660-3397
Appears in Collections:Environmental Health

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