A student walks through a disinfection gate before entering classroom at a high school in Kuala Lumpur, Malaysia, June 24, 2020. The reopening of schools for middle schools senior grade students in Malaysia proceeded on Wednesday in compliance with new standard operating procedures (SOP), after a nearly three month closure due to the outbreak of COVID-19. (Photo by Chong Voon Chung/Xinhua)

Students wearing face masks attend class at a high school in Kuala Lumpur, Malaysia, June 24, 2020. The reopening of schools for middle schools senior grade students in Malaysia proceeded on Wednesday in compliance with new standard operating procedures (SOP), after a nearly three month closure due to the outbreak of COVID-19. (Photo by Chong Voon Chung/Xinhua)

Students wearing face masks walk into a high school in Kuala Lumpur, Malaysia, June 24, 2020. The reopening of schools for middle schools senior grade students in Malaysia proceeded on Wednesday in compliance with new standard operating procedures (SOP), after a nearly three month closure due to the outbreak of COVID-19. (Photo by Chong Voon Chung/Xinhua)

Students have their body temperatures checked before entering classroom at a high school in Kuala Lumpur, Malaysia, June 24, 2020. The reopening of schools for middle schools senior grade students in Malaysia proceeded on Wednesday in compliance with new standard operating procedures (SOP), after a nearly three month closure due to the outbreak of COVID-19. (Photo by Chong Voon Chung/Xinhua)

Students wearing face masks attend class at a high school in Kuala Lumpur, Malaysia, June 24, 2020. The reopening of schools for middle schools senior grade students in Malaysia proceeded on Wednesday in compliance with new standard operating procedures (SOP), after a nearly three month closure due to the outbreak of COVID-19. (Photo by Chong Voon Chung/Xinhua)