5. Conclusion
This represents the first report of an outbreak of bovine cryptosporidiosis caused by the C. parvum subtype IIdA20G1, which appears to be an emerging pathogen in China and the Middle East. Significant morbidity and mortality have been associated with this outbreak, possibly as a result of concurrence of rotavirus on the farm. Control measures should be implemented to effectively reduce the transmission of C. parvum , which still occurs on only a portion of the dairy farms in China. Further studies are required to examine the clinical significance of rotavirus and C. parvum coinfections in neonatal calves.