A University of the Philippines microbiologist, Dr. A.V. Jacalne, has investigated the effectivity of Yakult as a biological agent for the prevention and control of diarrhoea due to enterogenic E. aoli, diarrhoeagentc Vibrios (V. choleras El Tor), and classical V. cholerae. Yakult is a commercially prepared milk drink containing Lactobacillus casei LC-9018 Shirota strain.