(a) As provided by law, when reactors to the tuberculin test are reported, the entire herd shall be placed under written quarantine, and before such quarantine may be revoked, shall be required to pass two negative tuberculin tests not less than 60 days apart. Further, such herds shall not be accredited until they have passed a third negative tuberculin test not less than 12 months following the test on which infection was disclosed.

(b) An accredited or clean herd in which shall all reported reactors prove, on postmortem examination, to have no gross lesions of tuberculosis, or to have skin lesions only, will require a 60-day negative retest by an official veterinarian before it can be restored to an accredited or clean status.