Tens of thousands of children aged 5 to 11 in New York City have received COVID-19 vaccine shots since the opening of school-based vaccination sites, and it is time for the city to further intensify the effort, Mayor Bill de Blasio said. “We’re seeing tremendous demand when it comes to the youngest New Yorkers, and it’s really exciting,” de Blasio said Monday during a press briefing. He added that even though the vaccine has only been available for the 5 to 11 year age group for a very brief period of time, the city is seeing a “really great response.” “Specifically, the focus on our school sites has been really, really promising,” de Blasio continued. “Parents are coming out in big numbers to get their kids vaccinated at the schools.” As of Monday morning, some 62,000 pediatric vaccine doses has already been administered in the city, including 22,500 given out …