ViraWarn Frequently Asked Questions
Each viral family has a unique surface property which determines its infectivity. Aerosolized viruses have extensive glycoprotein structures present on its surface that are different for different viruses. Thus, each type of virus has a unique surface charge distribution on the viral coat. This unique charge distribution, coupled with the resultant colloidal solution gives a unique platform for precise detection of aerosolized viruses. The bio sampler mechanism in the machine draws air inside and measures the electrical signal generated. Presence of a virus generates electrical signals that the algorithm program reads to generate a warning alarm and red light.
The ViraWarn alert is like a fire alarm in that it signals when something needs to be responded to, but it’s best used as part of a comprehensive BioViral Prevention Plan. Follow the link to learn how to create an effective BioViral Prevention Plan.
The false positive rate is 0.375, and the false negative rate is 0.1875, which means that 71.8 percent of the time, ViraWarn is detecting correctly. Justification of this false positive data can be given by literature reports suggesting that the well-established RT-PCR detection study has a false positive rate of 0-16.7 percent*. Our device has a similar false positive rate (Andrew N. Cohen et al., 2020). There are many on-going beta tests, and a few of those have been concluded. Our recently concluded tests, which have been done in collaboration with various national institutes, show high effectiveness of ViraWarn machine with various aerosolized viruses. The device has successfully detected various types of aerosolized viruses such as SARS-COV2, influenza, and more.
Andrew N. Cohen and Bruce Kessel. False positives in reverse transcription PCR testing for SARS-CoV-2. medRxiv 2020.04.26.20080911; doi: https://doi.org/10.1101/2020.04.26.20080911
This depends upon several other factors like the viral load discharge, particle matter (PM) status, viral aerosol stability, temperature, humidity and ventilation in that place, which might influence the chance of virus transmission. ViraWarn also suggests social distancing based on the above-mentioned parameters to avoid such a scenario.
If hosts are wearing an N95 or reusable elastomeric respirator, then they may not receive more than 5 percent, which may, however, constitute more than a few hundreds of payloads of the virus. The probability of getting infected under such a scenario is still possible, although it’s very minute.Van der Sande, M., Teunis, P., Sabel, R., 2008. Professional and home-made face masks reduce exposure to respiratory infections among the general population. PloS One 3, e2618. https://doi.org/10.1371/journal.pone.0002618.
The response time and effectiveness of the device depends on the proper placement of ViraWarn in a room and the size of the room. As a rule of thumb, one ViraWarn device should be used per every 100 square feet. The device comes with instructions on where ViraWarn should be placed.
There are two different ViraWarn models: X and XL. The light-weight, compact ViraWarn X plugs directly into an electrical outlet, mounting to the wall. ViraWarn XL is a standalone device with a larger media chamber, meaning users can go longer in between changing cartridges, which is important for uses like schools, offices and medical facilities where people are focused on their task at hand.