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Scientists from the University of Granada have called for "more rigor" in planning the return to schools in September since, according to a study on relationships without masks or sufficient distance, a group of 20 children in a nursery class would have contact with more than 800 people in two days, and this could mean the closure of many classrooms in the fall.

A team of researchers from the Department of Business Organization II of the University of Granada has compared the forecasts of the Government and the autonomous communities for the return to classes in September with the technical requirements and has warned of serious planning problems. The main problem, they point out, is that the authorities have focused on announcing the ideal of the face-to-face tour but do not have detailed plans for its development or for alternative situations.

The study has analyzed the number of relationships without masks and without distance expected in Early Childhood Education and in the first four years of Primary according to data from the Minister of Education. Isabel Celaá indicated a few days ago that both the classes and the families will function as a "bubble" of tranquility.

The professor of Business Organization and coordinator of this analysis, Alberto Aragón, stressed that the bubble would guarantee tranquility if it were closed, but each child and his teacher have their family and contacts . The study has taken as an average the family of two adults and 1.5 minors, so that each of the 20 students would have an exposure to a group of 74 people on their first day of class.

"If in addition the minors of those families were also in a different class, those relationships would be added to the set, reaching 808 people already involved on the second day of class," added Aragon, who said that in classrooms with a ratio of 25 students, As some autonomies have announced, it would represent 1,228 contacts.

The authors of the study have considered in a statement that any planning in a situation of uncertainty like the current one must consider multiple possible scenarios and in each one of them the resources that will be available must be defined.

"An open system of cohabitation bubbles such as that proposed by the Government and communities can only have limited effectiveness in controlling the risk of contagion, but it is especially ineffective when the number of schoolchildren in its nucleus is so high," they added. . A contagion in a person of that group carries an automatic risk for the whole group, so it is to be expected that any alert situation implies the closure of the group or even the entire school if they have shared common spaces or teachers.

They have also stressed the need to add non-contact hours and to have "on-call schools" that offer support for remote teaching.

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