The Alethia Pertussis External Control Kit contains Positive Control Reagent for use with the Alethia Pertussis DNA Amplification Assay. The External Positive Control Reagent is used in conjunction with the Alethia Assay Control/Negative Control reagent provided in the Pertussis kit as part of routine Quality Control Testing. External controls are used to aid the user in detection of unexpected conditions that may lead to test errors