Nevada will shift this week from broad restrictions in response to the coronavirus to an ongoing, county-by-county review where officials hope to target hot spots and specific businesses where the virus is spreading. Gov. Steve Sisolak and the state’s COVID-19 Response Director Caleb Cage said at a news conference Monday night that the state would evaluate Nevada’s 17 counties every Thursday on how they are faring on new reported cases of COVID-19, rates of positive tests and tests per day.