Pre-test and Post-test Counselling for HIV Infection in 300 Prostitutes of Chiangrai The author studied the effects of pre- and post-test counselling for HIV infection prospectively among 300 Chiangrai prostitutes from May 1, 1992 to April 16, 1993. The counsellors are paraprofessionals from the HIV/AIDS Collaboration who had been trained and supervised monthly by a psychiatrist or a clinical psychologist from Chiangrai Regional Hospital. The majority of the responses from 255 cases (85%) who received pre-test counselling were feeling fearful, sad and not feeling anything respectively. For those of 102 infected cases, 80 cases of them received the post-test counselling and the most frequent responses were sad, not feeling anything and acceptance respectively. The review of the monthly-supervision records found insecured feelings as a counsellor and as the one who has to inform the bad news.