The quality of the Viral Transport Tube is not only the "visible" performance indicators, but also the "invisible" performance indicators:

1. "Visible" performance indicators: Directly observed quality indicators such as Viral Transport Tube material, process level, sealing performance, and filling accuracy.

2. "Invisible" performance indicators: include the preservation effect of viral nucleic acid, the preservation effect of the minimum detection limit, microbial indicators, virus inactivation efficiency, etc. These indicators are the key to determining the detection of viral nucleic acid.

• Preservation effect of viral nucleic acid of Viral Transport Medium: The main function of Viral Transport Medium is to maintain the integrity of viral RNA nucleic acid and inhibit nucleic acid cleavage. Temperature, transportation conditions, and storage days all have an impact on the integrity of RNA. The better the RNA protection, the more accurate the nucleic acid detection of the virus.

• Virus inactivation efficiency of Viral Transport Medium: The inactivated Viral Transport Medium can improve the safety during sample collection and transportation.

• Minimum detection limit preservation effect: of Viral Transport Medium: Ensure that samples with low viral loads are detected and false negative test results do not occur.

• Microbiological indicators of Viral Transport Medium: The presence of microorganisms will accelerate the degradation of viral RNA and affect the sensitivity of nucleic acid detection. The Viral Transport Medium in the Viral Transport Tube is added with the color indicator phenol red. Under normal circumstances, the liquid should be alkaline and the color is purple. Once the microorganisms in the Viral Transport Tube are not up to standard, their reproduction will cause the pH value of the liquid to drop, and the preservation solution will turn yellow.