July 19, 2021 A stall assistant at the Raffles Institution canteen tested positive for Covid-19 on July 17. The Straits Times file SINGAPORE - Students in Years 1 to 4 at Raffles Institution will be on full home-based learning (HBL) on Monday (July 19) after a stall assistant at the school's canteen tested positive for Covid-19. This is to facilitate deep cleaning and disinfection of the Years 1 to 4 school canteen, said the school in a letter dated July 18 to parents and guardians signed by principal Frederick Yeo. The stall assistant at the canteen tested positive for the virus on Saturday. She was last in school on Friday and was well then, said the school.