what are longitudinal of cattle farming
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A longitudinal survey was performed on three cattle herds known to be positive for, respectively, Enterohemorrhagic Eschericia coli (EHEC) O157, O26/O103, and O26 in a slaughterhouse study. This study aimed to investigate the persistence and dissemination of EHEC in beef cattle and beef cattle farms. At each farm, a cohort of 10 animals was sampled, seven times on farm B and eight times on farms A and C, at intervals of approximately 4-6 weeks. In addition, incoming cattle and environmental samples were also examined for the presence of EHEC at each sampling occasion.
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