کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5805248 1555710 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The contribution of simple random sampling to observed variations in faecal egg counts
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله
The contribution of simple random sampling to observed variations in faecal egg counts
چکیده انگلیسی

It has been over 100 years since the classical paper published by Gosset in 1907, under the pseudonym “Student”, demonstrated that yeast cells suspended in a fluid and measured by a haemocytometer conformed to a Poisson process. Similarly parasite eggs in a faecal suspension also conform to a Poisson process. Despite this there are common misconceptions how to analyse or interpret observations from the McMaster or similar quantitative parasitic diagnostic techniques, widely used for evaluating parasite eggs in faeces. The McMaster technique can easily be shown from a theoretical perspective to give variable results that inevitably arise from the random distribution of parasite eggs in a well mixed faecal sample. The Poisson processes that lead to this variability are described and illustrative examples of the potentially large confidence intervals that can arise from observed faecal eggs counts that are calculated from the observations on a McMaster slide. Attempts to modify the McMaster technique, or indeed other quantitative techniques, to ensure uniform egg counts are doomed to failure and belie ignorance of Poisson processes. A simple method to immediately identify excess variation/poor sampling from replicate counts is provided.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Veterinary Parasitology - Volume 188, Issues 3–4, 10 September 2012, Pages 397-401
نویسندگان
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