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NEW YORK — New employees of the City of New York must get the COVID-19 vaccine before their first day on the job, Mayor Bill de Blasio said Monday.

The mayor said all new city workers will be required to show proof of vaccination.

The mandate is different from de Blasio’s previously announced policy of getting the vaccine or submitting to weekly testing for current city employees. New workers will not be given the option of weekly testing in replace of getting vaccinated.

When asked to estimate how many new employees the vaccine mandate would affect in the coming months, de Blasio said hundreds to potentially thousands of people.

Earlier Monday, Gov. Andrew Cuomo urged local governments and private businesses to implement vaccine mandates, as the state continues to experience a surge in new COVID-19 cases fueled by the extremely contagious delta variant.

On Monday, the state Health Department reported 2,143 new COVID cases, a one-day positivity rate of 2.96% and seven-day average of 2.53%.

Staten Island had the second highest seven-day positivity rate of all regions in the state at 3.37%. New York City’s overall seven-day average was 2.36%, according to state Health Department data.

The Centers for Disease Control and Prevention also listed the five counties that make up New York City as areas with “substantial” COVID transmission rates.