The animal is known as a ‘resolved IR’ and may re-join the herd. In the High Risk Area (HRA) and Edge Area (and TB breakdown herds in the Low Risk Area), resolved IRs are restricted for life to the holding in which they were found. However keeping resolved IRs in the herd poses significant risks.
If the animal does not test negative (i.e. is either a reactor or an IR again), it is classed as a reactor and compulsorily slaughtered.