An important obstacle in studying Cryptosporidium parvum is the lack of a permanent in vitro cultivation system of the parasite. While short-term cultures using various host cell lines have been widely employed, long-term cultures that would facilitate the immortalization of C. parvum isolates have not yet been developed. The description of the complete development of C. parvum in cell-free culture in 2004 has been received with great interest and also with some astonishment. Unfortunately, attempts to reproduce these results with different isolates of C. parvum and also C. hominis have failed. In this report, we provide an alternative interpretation of the nature of a parasite stage that occurs 24 hr after excystation of oocysts which, morphologically, is similar to stages that have been regarded as being extracellular trophozoites or merozoites by other investigators.
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From the field: a cryptosporidiosis outbreak among veterinary students associated with activities during the lambing period in Norway during 2024.
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Parasitology, Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Ås, Norway.
A recent outbreak of cryptosporidiosis (, subtype IIdA23G1) among veterinary students associated with extracurricular activities concerned with lambs is described from Norway. Although cryptosporidiosis outbreaks among veterinary students have been frequently reported, this is among the first from lamb contact. oocysts were detected in samples from two students and three lambs.
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Research Institute for Farm Animal Biology (FBN), Dummerstorf, Germany.
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Institute of Bioinformatics, University of Georgia, Athens, GA, 30602, USA.
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Analysis of gut microbiota with cryptosporidiosis based on fecal condition in neonatal dairy calves on a farm in Japan.
JDS Commun
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Division of Clinical Veterinary Medicine, Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido, 080-8555 Japan.
Cryptosporidiosis is a major cause of diarrhea and is associated with high morbidity in calves. Changes in the gut microbiota exacerbate diarrhea caused by infection in neonatal and weaned calves. However, information on the gut microbiota of neonatal calves with infection is scarce, and research into the microbiome of calves is essential for developing preventive and therapeutic interventions.
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