Elementary school students wearing face masks and face shields attend class, as schools reopen amid the coronavirus disease (COVID-19) pandemic, in Jakarta, Indonesia April 7, 2021. REUTERS/Ajeng Dinar Ulfiana

An elementary school student wearing a face mask and face shield has his temperature checked before attending class, as schools reopen amid the coronavirus disease (COVID-19) pandemic in Jakarta, Indonesia, April 7, 2021. REUTERS/Ajeng Dinar Ulfiana

An elementary school student wearing a face mask gives a greeting before attending class, as schools reopen amid the coronavirus disease (COVID-19) pandemic in Jakarta, Indonesia, April 7, 2021. REUTERS/Ajeng Dinar Ulfiana

An elementary school student wearing a face mask and a face shield washes her hands before attending class, as schools reopen amid the coronavirus disease (COVID-19) pandemic in Jakarta, Indonesia, April 7, 2021. REUTERS/Ajeng Dinar Ulfiana

A teacher wearing a face mask and a face shield gives a class, as schools reopen amid the coronavirus disease (COVID-19) pandemic in Jakarta, Indonesia, April 7, 2021. REUTERS/Ajeng Dinar Ulfiana

Elementary school students wearing face masks and face shields attend class, as schools reopen amid the coronavirus disease (COVID-19) pandemic, in Jakarta, Indonesia April 7, 2021. REUTERS/Ajeng Dinar Ulfiana