DETERMINING OPTIMAL CLEANING FREQUENCY AND METHODS FOR WOODEN AND PLASTIC CHOPPING BOARDS: Man Ling Chau1,2, Joanne Su Lin Kang1, Kyaw Thu Aung 1,2,3,5, Keng Wai Mak1,4, Sri Harminda Pahm Hartantyo1,2, Hooi Ming Yap1 and Lee Ching Ng1,5. SEATROPH 2021, 51 (4), 589-596.