A member of the MTA cleaning staff disinfects the 86th St. Q train station on March 4 in New York City. Yana Paskova/Getty Images

The biggest city in the United States is now a search zone for anyone who had close contact with five people recently diagnosed with coronavirus.

Eleven people across metro New York are infected with coronavirus, including the city's first case of community spread -- meaning the source of infection is unknown.

About 1,000 people are being asked to self-quarantine after the latest cases, said Gov. Andrew Cuomo.

Various health departments will contact those people and provide guidance.

"If anything, we are being over-cautious," Cuomo said.

Those asked to self-quarantine include some congregants of the Young Israel of New Rochelle synagogue in Westchester County, where cases have been confirmed.

Anyone who attended Young Israel services on February 22 and anyone who attended a funeral and a bat mitzvah on February 23 must self-quarantine, Westchester County Executive George Latimer said.

Read the full story here: