| prevalence of giardia sp. cryptosporidium parvum and cryptosporidium andersoni (syn. c. muris) [correction of cryptosporidium parvum and cryptosporidium muris (c. andersoni)] in 109 dairy herds in five counties of southeastern new york. | a cross-sectional study was undertaken to determine the prevalence of giardia sp. (g. duodenalis group), cryptosporidium parvum and cryptosporidium andersoni (c. muris) [corrected] in dairy cattle in three different age groups, and to evaluate the association of age and season with prevalence. one hundred and nine dairy farms, from a total of 212 farms, in five counties of southeastern new york volunteered to participate. on these farms, 2943 fecal samples were collected from three defined age g ... | 2000 | 11027856 |
| prevalence of cryptosporidium species and genotypes in mature dairy cattle on farms in eastern united states compared with younger cattle from the same locations. | feces collected from 541 milking cows on two dairy farms each in vermont, new york, pennsylvania, maryland, virginia, north carolina, and florida were examined for the presence of cryptosporidium oocysts. oocysts were concentrated from 15 g of feces from each cow and dna was extracted. a two-step nested pcr protocol was used to amplify an 830 base pair fragment of the ssurrna gene. pcr-positive products were purified and sequenced. pcr-positive findings were obtained from cows in all seven state ... | 2007 | 17287086 |
| seasonal variation in the prevalence and molecular epidemiology of cryptosporidium infection in dairy cattle in the new york city watershed. | we conducted cross-sectional studies in the new york city watershed to ensure a valid estimate of the risk associated with cryptosporidium infection in dairy herds. our aims were to obtain species-specific estimates of the prevalence of cryptosporidium in dairy cattle and to investigate seasonal variations in prevalence. we validated our empirical estimates using a bayesian approach. samples were collected on 32 study farms, once in each of 3 different seasons using an age-stratified sampling de ... | 2010 | 20397026 |