| prevalence and genotypes of giardia duodenalis in post-weaned dairy calves. | to determine the prevalence of giardia genotypes in post-weaned dairy calves, fecal specimens were collected from 3 to 11-month-old dairy calves per farm on two farms in vermont, new york, pennsylvania, maryland, virginia, north carolina, and florida. specimens cleaned of fecal debris and concentrated using cscl density gradient centrifugation were stained and examined by immunofluorescence microscopy and also subjected to pcr and dna sequence analysis. overall, pcr provided more sensitive detec ... | 2005 | 15925721 |