Workers prepare a quarantine center for COVID-19 patients at Hapania Exhibition Centre in the outskirts of Agartala, the capital city of India's northeastern state of Tripura, June 3, 2020. (Str/Xinhua)

Workers prepare a quarantine center for COVID-19 patients at Hapania Exhibition Centre in the outskirts of Agartala, the capital city of India's northeastern state of Tripura, June 3, 2020. (Str/Xinhua)

Workers prepare a quarantine center for COVID-19 patients at Hapania Exhibition Centre in the outskirts of Agartala, the capital city of India's northeastern state of Tripura, June 3, 2020. (Str/Xinhua)