New York City Mayor Bill de Blasio announced on Sunday a plan to close nonessential businesses and schools in nine zip codes in Brooklyn and Queens, NBC New York reports.

Why it matters: It will mark the first time the city has backpedaled on reopening since the spring, when New York was the epicenter of the virus.

The big picture: The nine neighborhoods listed by de Blasio had a testing positivity rate of more than 3% over the week, per the New York Times, amid an uptick in cases in the city and state.

• Gov. Andrew Cuomo tweeted that localities in the state "have not done an effective job of enforcement," and he said the state would begin conducting "aggressive enforcement."
• Cuomo must approve de Blasio's plan before it can go into effect.