A woman carrying her child waits in line to take a Covid-19 test Monday in Guangzhou, South China’s Guangdong province. Middle schools in Guangzhou (except Baiyun district) will resume in-person classes Wednesday, but those who attend classes will need to provide negative Covid-19 test results. Photo: Liang Yingfei/Caixin

Students, teachers and relevant school staff, as well as those living with them, are required to provide negative nucleic acid test results within 48 hours. They also have to take the nucleic acid test daily after they return to school. Photo: Liang Yingfei/Caixin

To ensure a smooth return to class, many parents of school-going children queue up to take nucleic acid tests, with some enduring long wait times and poor weather. Photo: Liang Yingfei/Caixin

An elderly man lines up to take a nucleic acid test in Guangzhou on Monday. Photo: Liang Yingfei/Caixin

A mother who queued up in Guangzhou’s Haizhu district told Caixin that some people stood in queues hundreds of meters long, while she herself had waited for more than an hour. Photo: Liang Yingfei/Caixin

A parent and her child waited near Guangzhou’s Xingang Road Primary School for their turn to take a nucleic acid test Monday. Photo: Liang Yingfei/Caixin

A parent shields her child from the rain Monday near Xingang Road Primary School, as they waited in line to take a nucleic acid test. Photo: Liang Yingfei/Caixin

A man checks out how long the line in front of him is. Households need to provide a negative test result to ensure their school-going children can return to class. Photo: Liang Yingfei/Caixin

Residents queue alongside shopfronts near a middle school in Yuexiu district, Guangzhou. Photo: Liang Yingfei/Caixin

A long line of residents queues to take a Covid-19 test in Guangzhou’s Yuexiu district on a rainy Monday. City authorities announced the suspension of in-person classes at elementary and middle schools on April 11. Photo: Liang Yingfei/Caixin