COVID-19 trends on the decline in Nevada Medical experts warn to still stay vigilant COVID-19 trends in Nevada are on the decline but we are not out of woods just yet. Medical professionals say to stay vigilant. and last updated 2021-02-21 21:31:47-05 LAS VEGAS (KTNV) â Nevada's test positivity rate is now below 10%, a major milestone in our fight against COVID-19. The last time our test positivity rate was this low was back on Nov. 3. âIt shows there's less transmission, but it also shows fewer people are being tested for it. The goal ultimately is to get below 5%. That's the target to show that we basically have things kind of under control in our community. We're still up twice that,â expressed Dr. Brian Labus, an infectious disease epidemiologist.