Since then, the number of confirmed cases has reached at least 33. Now, anxious New Yorkers are wondering just how wide the virus will spread.

[Update: Gov. Andrew M. Cuomo has declared a state of emergency in New York over the coronavirus.]

Here’s what we know.

The new cases

A rabbi at a synagogue in Westchester County who is connected to a number of cases in the state tested positive for the coronavirus, according to an email he sent to his congregation last night.

Today, New York City officials also announced a new confirmed case in Manhattan, a man in his 50s.

Also yesterday, officials confirmed several cases of the coronavirus. Two were in New York City: A man in his 40s and a woman in her 80s were both hospitalized and in critical condition, Mayor de Blasio said.