Contained in each box of screening kits, you will find two “Control Swabs”; one of those swabs will produce a negative result and the other swab will produce a positive result. These control swabs are ONLY to be used for quality control purposes. If you are finding that the results of screening kits from a particular box are not showing up on the testing pads, then you can follow the process in the manual provided to do a quality control check of the pads by simply following the same testing regime. DO NOT SWAB ANYONE WITH THESE CONTROL SWABS; the swabs already have ingredients on them to produce results in the quality control process. While the positive control swab will show positive for COVID-19, there is nothing on the swab that is infectious or that will pass COVID-19 to a person. It is a pre-loaded swab and should not be used for anything other than quality control, if required.