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Opinion Back to school: With experience and vaccines, it can be back to normal

For a third year, schools are opening in the presence of covid-19 for the first time in three years. Ruben Navarrette: Vaccines are widely available, free and highly effective at protecting against severe illness and hospitalization. He says schools should strive to reach four to six air exchanges per hour, better ventilation and filtration can reduce the chances of infection. Navarro: If sick, stay home. Hand hygiene is still important, but prudence still matters. If you’re sick, you need to be careful to stay home, he says. It no longer makes sense to pursue draconian quarantines of a whole class if one student tests positive.