[pct-l] Waterborne giardia: a new look at the evidence
Tortoise
Tortoise73 at charter.net
Sun Sep 9 20:31:24 CDT 2012
I just went to Buck's blog and followed the link to the new study.
http://www.ncbi.nlm.nih.gov/pubmed/10737847 and read the abstract which is:
> Risk of giardiasis from consumption of wilderness water in North America:
> a systematic review of epidemiologic data.
> Welch TP.
> Source
> Department of Tropical Medicine, Tulane University School of Public
> Health and Tropical Medicine, New Orleans, LA 70112, USA.
> twelch2 at mailhost.tcs.tulane.edu
>
> Abstract
> OBJECTIVES:
> A meta-analytic study was conducted to test the hypothesis that
> consumption of water from North American backcountry sources poses a
> statistically significant risk for acquisition of giardiasis.
> METHODS:
> The biomedical literature was surveyed by accessing Medline, and
> identified studies were supplemented with references in current reviews,
> published dissertations, and prior communications with state health
> departments. Studies were classified by methodologic design and subjected
> to predetermined inclusion criteria. Odds ratios with 95% confidence
> intervals, chi-squares, and P-values for epidemiologic surveys were
> either computed from raw data or abstracted directly from the included
> studies.
> RESULTS:
> Of 104 articles identified in the initial screening, nine met the
> inclusion criteria. Neither of two case reports met the criteria of the
> Centers for Disease Control and Prevention (CDC) for waterborne disease
> outbreak. Two prospective studies were identified, but neither showed a
> significant association. Of four case-control studies providing data,
> three reported an odds ratio of greater than one.
> CONCLUSIONS:
> *Published reports of confirmed giardiasis among outdoor recreationalists
> clearly demonstrate a high incidence among this population. However, the
> evidence for an association between drinking backcountry water and
> acquiring giardiasis is minimal. *[emphasis added by me] Education
> efforts aimed at outdoor recreationalists should place more emphasis on
> handwashing than on water purification. Further studies should attempt to
> separate the specific risk factor of drinking water from backcountry
> sources from other behaviors among this group that may contribute to the
> risk.
> PMID: 10737847 [PubMed - indexed for MEDLINE]
This was a review of biomedical literature. The abstract says that back
country water is not the problem.
Tortoise
Those who make peaceful revolution impossible will make violent revolution inevitable
President John F Kennedy, 1962
All content is copyrighted. Reproduction or use elsewhere is is expressly prohibited without the express permission of the author. Use within the PCT-list is permitted.
On 2012.09.08 10:11, Bruce 'Buck' Nelson wrote:
> Just made a new blog post. I hope those interested will check it out.
>
> Comments about my intellect, ancestry, physical appearance, or honesty
> should be directed to my blog. I welcome other comments at my blog or
> here.
>
> Don't know if the clickable link will work or not so I've included it twice:
>
> http://bucktrack.blogspot.com/2012/09/backpacker-giardia-debunking-skeptical_8.html
>
> <a href="http://bucktrack.blogspot.com/2012/09/backpacker-giardia-debunking-skeptical_8.html">Backpacker
> Giardia: Debunking a Skeptical Paper</a>
>
> Happy PCTing
>
> Colter
> _______________________________________________
> Pct-L mailing list
> Pct-L at backcountry.net
> To unsubcribe, or change options visit:
> http://mailman.backcountry.net/mailman/listinfo/pct-l
>
> List Archives:
> http://mailman.backcountry.net/pipermail/pct-l/
> All content is copyrighted by the respective authors.
> Reproduction is prohibited without express permission.
>
More information about the Pct-L
mailing list