Antibiotic treatment was administered to only ~10% of the cows, and in only the higher cutoff-level groups-CL4 and CL5. When the recovery was set to R2, percent spontaneous recovery was 25–27% at the three higher cutoff levels (C元–CL5) and 35–41% at the lowest levels (CL1, CL2). No difference was found among cutoff levels when the recovery was set to R1, with only 10–12% of the cows presenting spontaneous recovery. Recovery was defined as decreased SCC on all three monthly test days, or on the second and third test days, set to: R1 (<100 × 10 3 cells/mL) R2 (<250 × 10 3 cells/mL).
Each cutoff level was analyzed separately, and each cow appeared only once in the same lactation and cutoff level, thus resulting in five independent analyses. A large retrospective analysis of data compiled from the Israeli Dairy Herd Book was performed to evaluate the occurrence of: (i) actual “spontaneous recovery” from the inflammation (ii) recovery from the inflammation due to antibiotic treatment. In cow mastitis, it refers to cases exhibiting visual symptoms (clinical) or an increase in somatic cell count (SCC) with no visual symptoms (subclinical), with or without identification of a pathogen, from which the animal recovers. The term “spontaneous recovery” refers to a return to a previous condition without any external treatment.
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