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. 2003 Sep;10(5):910–916. doi: 10.1128/CDLI.10.5.910-916.2003

TABLE 2.

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

PI Interpretation
Sensitivity for detection of previous E. ruminantium infectiona (%)
Goats Cattle Goats Cattle
<50 Not previously exposed to E. ruminantium Probably not previously exposed to E. ruminantium NA NA
50-70 Cross-reaction with other Ehrlichia sp. or weakly positive for E. ruminantiumb Weakly positive for E. ruminantiumb or cross-reaction with other Ehrlichia sp. 100 86
71-85 Prior infection with or exposure to E. ruminantiumb or Ehrlichia sp. Prior infection with or exposure to E. ruminantium 100 79
>85 Prior infection with or exposure to E. ruminantium Prior infection with or exposure to E. ruminantium 91 31
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.