Which mask works best? To visualise droplets and aerosols, UNSW researchers used LED lighting system & a high-speed camera, filming people coughing and sneezing in different scenarios — using no mask, two different types of cloth masks, and a surgical mask.
We confirmed that even speaking generates substantial droplets. Coughing and sneezing (in that order) generate even more. A three-ply surgical mask was significantly better than a one-layered cloth mask at reducing droplet emissions caused by speaking, coughing and sneezing, followed by a double-layer cloth face covering. A single-layer cloth face covering also reduced the droplet spread caused by speaking, coughing and sneezing but was not as good as a two-layered cloth mask or surgical mask.
We do not know how this translates to infection risk, which will depend on how many asymptomatic or mildly symptomatic infected people are around. However, it shows a single layer is not as good a barrier as a double layer.
For over 20 years, the IAEA, in partnership with the the Food and Agriculture Organization of the United Nations (FAO) , has trained and equipped experts from all over the world to use the real time RT–PCR method, particularly through its VETLAB Network of veterinary diagnostic laboratories. Recently, this technique has also been employed to diagnose other diseases, such as Ebola, Zika, MERS and SARS, as well as other major animal diseases. It has also been used to detect major zoonotic diseases, which are animal diseases that can also infect humans.
Greg Patton, a development scientist at New England Biolabs, is one of the developers of the SARS-CoV-2 Rapid Colorimetric LAMP Assay Kit, which was just released by NEB. In this video, Greg is going to tell us about how the kit works, what type of samples are compatible with it, and he’ll explain the kit’s intended uses.