Se. Wade et al., Prevalence of Giardia sp, Cryptosporidium parvum and Cryptosporidium muris(C. Andersoni) in 109 dairy herds in five counties of southeastern New York, VET PARASIT, 93(1), 2000, pp. 1-11
A cross-sectional study was undertaken to determine the prevalence of Giard
ia sp. (G. duodenalis group), Cryptosporidium parvum and Cryptosporidium mu
ris (C. andersoni) in dairy cattle in three different age groups,and to eva
luate the association of age and season with prevalence. One hundred and ni
ne dairy farms, from a total of 212 farms, in five counties of southeastern
New York volunteered to participate. On these farms, 2943 fecal samples we
re collected from three defined age groups. The farms were randomly assigne
d for sampling within the four seasons of the year. Each farm was visited o
nce during the study period from March 1993 to June 1994 to collect fecal s
amples. Demographic data on the study population was collected at the time
of sampling by interviewing the farm owner or manager. At collection, fecal
samples were scored as diarrheic or non-diarrheic, and each condition was
later related to positive or negative infection with these parasites. Fecal
samples were processed using a quantitative centrifugation concentration f
lotation technique and enumerated using bright field and phase contrast mic
roscopy. In this study, the overall population prevalence for Giardia sp. w
as 8.9%; C. parvum, 0.9%; and C. muris, 1.1%. When considering animals most
at the risk of infection (those younger than 6 months of age) Giardia sp.
and C. parvum was found in 20.1 and 2.4% of the animals, respectively. Giar
dia sp. and C. muris were found in all age groups. There was no significant
seasonal pattern of infection for any of these parasites. (C) 2000 Elsevie
r Science B.V. All rights reserved.