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In. u.s. covid hospitalizations have now surpassed the peak seen from the delta variant. that was in september. nearly 113,000 people are currently hospitalized with covid. a large number of infections has forced everything from schools to airlines, hospitals, to cut back or modify services. cnn's alexander field explains. >> we cannot feed into hysteria. this is traumatizing our cu children. >> reporter: in an unprecedented covid surge, new york city's new mayor insisting schools really are the safest place for children. >> i need my cities to open, and we have to be safe. we have to double d...

And ensure what we're seeing in adults, what we're seeing in other countries experienced broadly holds up when you look at young children. the best advice that i have is to try and reduce the chances that your children get covid by following public health advice. >> that public health advice, as you know, dr. besser, to date, you hear this -- we heard it again on cnn this morning from the surgeon general, which is going to school is just fine with mitigation. mask wearing, better ventilation, et cetera. as you look at this data, do you think that advice holds? >> well, you know, i don't think ...

Thinking of how do we live with covid? >> reporter: the vast majority of schools throughout the country are pressing on and keeping students in the classroom. >> what we've learned over the past two years is that there's significant risk keeping children out of school. >> reporter: but, according to the data company burbio, more than 3200 schools are going remote or delaying returns from winter break. l.a. unified school district, the tleeft push back its start date by one day and require proof of a negative test. in chicago, the powerful teachers union is threatening a walkout over decisions ...