On the occasion of World Toilet Day on Friday, Visakhapatnam District Collector Dr. Mallikarjuna visited ZP High School and felicitated 'Ayammas' who are working in the school. He lauded the services of the ayammas who are working to keep the surroundings of the school neat and tidy. After that, he himself cleaned the toilets. World Toilet Day: World Toilet Day is observed on