Reasons to be fearful? Rising proportions of positive faecal worm egg counts among UK horses (2007-2023).

FWECT laboratory surveillance data submitted to EQDSR Overall, there was clear evidence to support the logical assumption that adopting lower FWECT‐thresholds for surveillance reporting resulted in higher PTP (positivity rates), with the highest PTP levels evident among the baseline threshold category (>0 to <100 epg) and a clear trend in regression analysis for reducing PTP with application of increasing threshold levels.

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There was an evident trend of reduction of −12% for ≥100 to <300 epg (level 2) and −18% for ≥300 epg (level 3) compared with baseline, consistent with a logical gradient of increasing threshold levels reducing PTP.

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