Please find enclosed a recent article regarding the role of Cryptosporidiosis in calf diarrhoea in UK.
Joséphine Verhaeghe, dairy specialist of CID LINES, just summarized the key factors that we should keep in mind:
-          The prevalence of diarrhoea is estimated at 30% of all calves and causes almost 50% of calf mortality
-          C.parvum is a leading cause of enteric disease in calves < 1 month old (it represents approx. 37% of the diagnostic submissions)
-          About the transmission:
o   Important infection around the time of birth (adults are shedding the parasites without any symptoms)
o   Due to accumulation of contamination, an increase in disease is seen as the calving season progresses
o   Transmission between farms happens mainly via the purchasing of shedding animals
-          Regarding the symptoms: from asymptomatic infection to death
-          Control: the goal is to reduce the shedding of oocysts (and therefore the environment contamination)
o   Treatment is not satisfying: “Understandably, many farmers are frustrated at the apparent lack
of progress towards a ‘silver bullet’ that will treat the signs of cryptosporidiosis.”
o   Other control strategies:
§  Colostrum (the 3 Qs rule: Quality (at least 20g/L of IgG), Quantity (3L or 10% of the Body Weight), Quicky (fed in the first 2 hours of life)
§  Disinfection: 2-3% Kenocox, 2-4% Neopredisan, 10% Ox-Virin and 3% hydrogen peroxide are mentioned as effective disinfectants
§  Farm management practices, especially to avoid mixing calves of 1-3 weeks old with neonates
And please, don't forget to read the conclusion of this article:
While there is unlikely to be a novel licensed therapeutic product or vaccine in the near future, there is much that can be done tocontrol cryptosporidiosis on farms. Veterinary advice should be targeted at minimising the build-up of environmental contamination and reducing the clinical impact by optimising the neonatal environment and controlling other enteropathogens.”