Infección por Cryptosporidium spp. en ganado vacuno de la cuenca lechera de la provincia de Santa Fe (Argentina)

Prevalence and risk factors for shedding of Cryptosporidium spp. oocysts in dairy calves of Buenos Aires Province, Argentina

“…The individual level prevalence of oocysts shedding in this study was determined as 16.3% and thus slightly lower than 17.1%, 19.3%, and 24% reported by Del Coco et al ( 2008 ) Tiranti et al ( 2011 ) and Modini et al ( 2011 ), respectively. The slightly higher prevalence determined in their studies compared to our study is likely due to the younger strata of calves analyzed.…”

“…In Argentina, depending on the methodology used and the area of study, the prevalence in dairy calves has been reported between 17 and 29% ( Bellinzoni et al, 1990 , Del Coco et al, 2008 , Modini et al, 2011 , Tiranti et al, 2011 ). Although these results seem to agree, they cannot be extrapolated to other dairy calves' populations.…”

Prevalence, risk factors and molecular epidemiology of neonatal cryptosporidiosis in calves: The Argentine perspective

“…Cryptosporidium infection is associated with diarrhoea as a clinical manifestation in calves less than 21 days of age (OR = 5.7, Garro et al, 2021 ) or 60 days of age (OR = 3, Bertoni et al, 2021 ; OR = 5.5, Garro et al, 2016 ), as reported in large-scale studies involving more than 19 herds. Comparable values have been reported for calves of the same age groups when single or few farms were sampled and studied (RR = 5.9, Aguirre et al, 2014 ; RR = 2.9, Modini et al, 2011 ) ( Table 2 ). Garro et al (2021) showed that, in addition of Cryptosporidium (OR = 5.7, P < 0.0001), RVA infection (OR = 2.5, P < 0.05) was a significant risk factor for diarrhoea in calves ≤ 20 days of age in the Province of Buenos Aires.…”

“…Other epidemiological investigations carried out in Santa Fe Province included a considerably lower number of calves sampled from a single or up to eight dairy herds ( Table 1 ). In addition, these studies stay apart because of the use of the highly sensitive Sheatherʼs concentration method, which may explain in part the considerably higher infection rates of 43% and 46.2% observed in calves under 20 days of age, as reported by Modini et al (2011) and Aguirre et al (2014) , respectively ( Table 1 ). Furthermore, an unusually high rate of infection of 83.0% in calves under 15 days of age, and of 85% in calves under 60 days of age were reported from a single farm that artificially raised dairy calves from other farms.…”

“… Independent variable Dependent variable Levels a OR RR 95% CI P -value Reference Cryptosporidium spp. Diarrhoea ≤ 20 days 5.7 – 3.3–9.9 <0.001 Garro et al (2021) 1–60 days 3 – 1.8–5.0 <0.001 Bertoni et al (2021) 1–60 days 5.5 – 2.6–11.6 <0.0001 Garro et al (2016) ≤ 21 days – 5.9 1.3 – 27.3 <0.01 Aguirre et al (2014) ≤ 15 days – 2.9 1.4 – 5.6 – Modini et al (2011) Cryptosporidium + Rotavirus Diarrhoea ≤ 20 days 9.2 – 2.8–29.0 0.001 Garro et al (2021) Abbreviations : OR, odds ratio; RR, relative risk; CI, confidence interval. a Values obtained in studies of three and eight herds are given in italics; values based on regional studies that involved at least 19 or up to 42 herds are given in normal font type (see Table 1 ).…”