Variations in oocyst output associated with Cryptosporidium baileyi infections in chickens

Taylor, Mike; Catchpole, J.; Norton, C. C.; Green, J.A.

doi:10.1016/0304-4017(94)90011-6

Cited by 15 publications

(8 citation statements)

References 10 publications

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“…Conjunctival susceptibility seems true also of Grouse chicks as we also found that older chicks (21-50 days after hatching) of pairs containing a diseased female tended to have lower survival, with the timing of mortality at least coincident with when inflammation of the periorbital eye tissues was generally seen among sampled chicks. In other species, this matches when infection first begins to have a direct effect on the chicks themselves (Maca & Pavlasek 2015) and when oocyst excretion was at its highest (Taylor et al 1994). We found few older chicks to be infected, but here the number sampled was low due to chicks being able to fly to evade capture.…”

Section: Redmentioning

confidence: 52%

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Lethal and sub‐lethal impacts of respiratory cryptosporidiosis on Red Grouse, a wild gamebird of economic importance

Baines

Allinson

Duff

et al. 2018

Ibis

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Respiratory cryptosporidiosis was first diagnosed in Red Grouse Lagopus lagopus scotica, the UK subspecies of Willow Ptarmigan, in 2010. In the next 3 years, respiratory infection by Cryptosporidium baileyi had manifested itself in Grouse on half the moors in northern England and 80% of moors in the North Pennine Hills. In this first account of the impact of respiratory cryptosporidiosis on the population dynamics of a wild bird we fitted 111 diseased and 67 healthy Grouse with radio‐transmitters at two North Pennine moors where disease prevalence averaged 8.1% and monitored their survival and fecundity between autumn 2013 and autumn 2015. Six‐month natural survival rates (excluding shooting) were 0.70 in healthy Grouse, but only 0.44 in diseased females, and 0.22 in diseased males. Some 39% of diseased birds died from their infection, whereas 28% of healthy birds were shot. A similar proportion of each group were killed by predators, either by Stoat Mustela erminea or raptors. Diseased females bred 8 days later than healthy females, but clutch size, egg volume and nesting success did not differ in relation to disease status. Productivity was 43% lower among pairs with a diseased member than in healthy pairs, but appeared impaired only if the female was diseased, not the male. Differences in productivity were related to chick survival rather than the proportion of pairs that reared broods, with chick survival being lower in the 10 days after hatching and again when chicks were 20–50 days old. This latter period was when respiratory infection among chicks was first noticed and the onset of infection may have been a contributing factor to higher mortality during this period. Described levels of respiratory infection reduced the number of birds available to shoot in August by 6%, which represented a mean annual loss of £0.9 million in revenue across managed grouse moors. Likely reductions in shoot economics could escalate should prevalence increase. This disease is a welfare concern and potentially a conservation concern, too, should infection cross to other bird species occupying the same moors.

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Section: Redmentioning

confidence: 52%

“…In other species, this matches when infection first begins to have a direct effect on the chicks themselves (Maca & Pavlasek ) and when oocyst excretion was at its highest (Taylor et al . ). We found few older chicks to be infected, but here the number sampled was low due to chicks being able to fly to evade capture.…”

Section: Discussionmentioning

confidence: 97%

Lethal and sub‐lethal impacts of respiratory cryptosporidiosis on Red Grouse, a wild gamebird of economic importance

Baines

Allinson

Duff

et al. 2018

Ibis

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“…Respiratory as well as intestinal and bursal Cryptosporidium infections cause disease in chickens, but infection without clinical symptoms has also been observed (Fletcher et al 1975;Taylor et al 1994).…”

Section: Chickensmentioning

confidence: 99%

Cryptosporidiosis in Farmed Animals

Robertson

Björkman

Axén

et al. 2013

Cryptosporidium: Parasite and Disease

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Cryptosporidiosis was first identified as a disease of veterinary, rather than human medical, importance, and infection of farmed animals with different species of Cryptosporidium continues to be of veterinary clinical concern. This chapter provides insights into Cryptosporidium infection in a range of farmed animals -cattle, sheep, goats, pigs, cervids, camelids, rabbits, water buffalo and poultry -presenting not only an updated overview of the infection in these animals, but also information on clinical disease, infection dynamics and zoonotic potential. Although extensive data have been accrued on, for example, Cryptosporidium parvum infection in calves, and calf cryptosporidiosis continues to be a major veterinary concern especially in temperate regions, there remains a paucity of data for other farmed animals, despite Cryptosporidium infection causing

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“…After applying a coverslip, the sample was first examined under a low power objective (× 10) for the presence of helminth parasites, and then at higher resolution (× 40 objective) for evidence of mobile protozoa and protozoal cysts. Faecal samples were also examined by a modified Ziehl‐Neelsen method (Taylor and others 1995) for the presence of Cryptosporidium oocysts.…”

Section: Case Historymentioning

confidence: 99%

Clinical and pathological observations on natural infections of cryptosporidiosis and flagellate protozoa in leopard geckos ( Eublepharis macularius )

1999

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Variations in oocyst output associated with Cryptosporidium baileyi infections in chickens

Cited by 15 publications

References 10 publications

Lethal and sub‐lethal impacts of respiratory cryptosporidiosis on Red Grouse, a wild gamebird of economic importance

Lethal and sub‐lethal impacts of respiratory cryptosporidiosis on Red Grouse, a wild gamebird of economic importance

Cryptosporidiosis in Farmed Animals

Clinical and pathological observations on natural infections of cryptosporidiosis and flagellate protozoa in leopard geckos ( Eublepharis macularius )

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