Children wearing face shields as a precaution against the new coronavirus outbreak sit spaced apart in individual tables at the Pereira Agustinho daycare, nursery school and pre-school, after it reopened amid the new coronavirus pandemic in Duque de Caxias, Monday, July 6, 2020. The city of Manaus in the Amazon rainforest and Duque de Caxias in Rio de Janeiro’s metropolitan region, became on Monday the first Brazilian cities to resume in-person classes at private schools since the onset of the COVID-19 pandemic, according to the nation's private school federation. (AP Photo/Silvia Izquierdo)

Bernardo Santo attends a class wearing a face shield, at the Pereira Agustinho daycare, nursery school and pre-school, after it reopened amid the new coronavirus pandemic in Duque de Caxias, Monday, July 6, 2020. The city of Manaus in the Amazon rainforest and Duque de Caxias in Rio de Janeiro’s metropolitan region, became on Monday the first Brazilian cities to resume in-person classes at private schools since the onset of the COVID-19 pandemic, according to the nation's private school federation. (AP Photo/Silvia Izquierdo)

Stuffed animal toys are used to remind children to keep there distance amid the COVID-19 pandemic, at the Pereira Agustinho daycare, nursery school and pre-school, after it reopened amid the new coronavirus pandemic in Duque de Caxias, Monday, July 6, 2020. The city of Manaus in the Amazon rainforest and Duque de Caxias in Rio de Janeiro’s metropolitan region, became on Monday the first Brazilian cities to resume in-person classes at private schools since the onset of the COVID-19 pandemic, according to the nation's private school federation. (AP Photo/Silvia Izquierdo)

A teacher checks the temperature of Bernardo Santo as he arrives at the Pereira Agustinho daycare, nursery school and pre-school, after it reopened amid the new coronavirus pandemic in Duque de Caxias, Monday, July 6, 2020. The city of Manaus in the Amazon rainforest and Duque de Caxias in Rio de Janeiro’s metropolitan region, became on Monday the first Brazilian cities to resume in-person classes at private schools since the onset of the COVID-19 pandemic, according to the nation's private school federation. (AP Photo/Silvia Izquierdo)

Rafaely de Melo puts on her protective mask during a class at the Pereira Agustinho daycare, nursery school and pre-school, after it reopened amid the new coronavirus pandemic in Duque de Caxias, Monday, July 6, 2020. The city of Manaus in the Amazon rainforest and Duque de Caxias in Rio de Janeiro’s metropolitan region, became on Monday the first Brazilian cities to resume in-person classes at private schools since the onset of the COVID-19 pandemic, according to the nation's private school federation. (AP Photo/Silvia Izquierdo)

Rafaely de Melo, wearing a protective mask, jumps during gym class at the Pereira Agustinho daycare, nursery school and pre-school, after it reopened amid the new coronavirus pandemic in Duque de Caxias, Monday, July 6, 2020. The city of Manaus in the Amazon rainforest and Duque de Caxias in Rio de Janeiro’s metropolitan region, became on Monday the first Brazilian cities to resume in-person classes at private schools since the onset of the COVID-19 pandemic, according to the nation's private school federation. (AP Photo/Silvia Izquierdo)