TABLE 2.

Suggested ranges for categorization of PC-ELISA results and sensitivity for detection of prior E. ruminantium infection

PIInterpretationSensitivity for detection of previous E. ruminantium infectiona (%)
GoatsCattleGoatsCattle
<50Not previously exposed to E. ruminantiumProbably not previously exposed to E. ruminantiumNANA
50-70Cross-reaction with other Ehrlichia sp. or weakly positive for E. ruminantiumbWeakly positive for E. ruminantiumb or cross-reaction with other Ehrlichia sp.10086
71-85Prior infection with or exposure to E. ruminantiumb or Ehrlichia sp.Prior infection with or exposure to E. ruminantium10079
>85Prior infection with or exposure to E. ruminantiumPrior infection with or exposure to E. ruminantium9131
  • a Where the cutoff is the lowest value in the range given and sensitivity for detection of previous E. ruminantium infection is calculated from results with experimental infections. NA, not applicable.

  • b Except in situations where suitable Amblyomma vectors are considered to be absent.