Disposable nucleic acid reagent refers to the new coronavirus antigen self-test paper, nucleic acid can not be self-tested, the new coronavirus antigen self-test paper can be used according to the instructions, or under the guidance of professionals, usually sampling tube placement, liquid drop hole, the results of the interpretation. 1. Sampling tube: gently insert the swab into the nasal cavity, rotate the swab at least four times against the back of the nasal cavity, repeat on the other side of the nasal cavity, and then place the head of the swab into the sampling tube to ensure that the sample is sufficiently eluted in the sampling tube for the self-tested persons aged 2 to 14 years old. 2. Liquid Drip Hole: Squeeze the swab liquid through the sampling tube, cover the sampling tube, and drop the liquid vertically into the test hole of the test card. 3. Interpretation of results: Wait for a certain period of time, C, T are red or purple is positive; C shows red or purple, T does not show is negative; C does not show red or purple, T with or without display is invalid. The new coronavirus antigen self-test paper is applicable to isolated observation personnel as well as community personnel, and the result, whether negative or positive, the swabs, test tubes, test cards, etc., should be put in sealed bags after sampling and disposed of according to the medical waste or procedures. The results of the self-test can be used for early screening of the suspected population and cannot be used as a basis for definitive diagnosis.