![]() ![]() This includes things like door handles and stainless steel.īut the half-life dropped to six hours when humidity rose to 80 percent-and to just two minutes when sunlight was added to the equation. It showed that the virus's half-life-the time taken for it to reduce to half its amount-was 18 hours when the temperature was 70 to 75 degrees Fahrenheit (21 to 24 degrees Celsius) with 20 percent humidity on a non-porous surface. "Not that it would be done badly, just that there are several different ways to count viruses, depending on what aspect you are interested in studying."īryan shared a slide summarizing major findings of the experiment that was carried out at the National Biodefense Analysis and Countermeasures Center in Maryland. "It would be good to know how the test was done, and how the results were measured," Benjamin Neuman, chair of biological sciences at Texas A&M University-Texarkana, told AFP. It has long been known that ultraviolet light has a sterilizing effect, because the radiation damages the virus's genetic material and their ability to replicate.Ī key question, however, will be what the intensity and wavelength of the UV light used in the experiment was and whether this accurately mimics natural light conditions in summer. ![]() "We've seen a similar effect with both temperature and humidity as well, where increasing the temperature and humidity or both is generally less favorable to the virus."īut the paper itself has not yet been released for review, making it difficult for independent experts to comment on how robust its methodology was. "Our most striking observation to date is the powerful effect that solar light appears to have on killing the virus, both surfaces and in the air," he said. William Bryan, science and technology advisor to the Department of Homeland Security secretary, told reporters at the White House that government scientists had found ultraviolet rays had a potent impact on the pathogen, offering hope that its spread may ease over the summer.
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