A pre-experimental study was conducted on 30 mothers of under five children to assess the effectiveness of structured teaching programme on their knowledge regarding home based preventive measures of acute respiratory infection with the objectives of assessing the knowledge of mothers regarding ARI and to find out the association The conceptual model adopted for the study was Roy’s Adaptation Model (1989). One group pretest posttest design, with an evaluative approach was used for the study. The knowledge assessment questionnaire which consists of 30 questions regarding ARI and its home based prevention. The minimum score of the knowledge assessment questionnaire was 0 and maximum score was 30. The study findings revealed that the in pre-test, 6.67% of mother were having poor knowledge while 93.33% mothers were having adequate knowledge. Where as in posttest test 46.67% of mothers were having adequate knowledge and 53.33 were having good knowledge. Paired ‘t’ test results showed statistically significant gain in knowledge with the t calculated (23.09*) at (p<0.001) after the administration of structured teaching programme. The study concluded that there was a need of educational programs for the mother to enhance their knowledge regarding the prevention of ARI among under five children. 

Keywords: Structured Teaching Programme; Acute Respiratory Infections;  Mortality.