A man sprays disinfectant on seats in Colombo, Sri Lanka, March 16, 2020. Seven Sri Lankan nationals who recently arrived in Sri Lanka from Italy tested positive for the COVID-19 virus on Sunday, raising the total number of positive cases to 18, the Health Ministry said. (Photo by A.Hapuarachchi/Xinhua)

A staff member sprays disinfectant in Colombo, Sri Lanka, March 16, 2020. Seven Sri Lankan nationals who recently arrived in Sri Lanka from Italy tested positive for the COVID-19 virus on Sunday, raising the total number of positive cases to 18, the Health Ministry said. (Photo by A.Hapuarachchi/Xinhua)

A man sprays disinfectant on bus in Colombo, Sri Lanka, March 16, 2020. Seven Sri Lankan nationals who recently arrived in Sri Lanka from Italy tested positive for the COVID-19 virus on Sunday, raising the total number of positive cases to 18, the Health Ministry said. (Photo by A.Hapuarachchi/Xinhua)