Introduction: The third ranked country with the highest hepatitis cases in the world is Indonesia. The incidence of Hepatitis A in Indonesia has increased since 2007 amounted to 19.3% and infected many people aged over 15 years old. In 2010 there were 6 outbreaks with 279 sufferers, in 2011 there were 9 outbreaks with 550 patients, in 2012 there were 8 outbreaks with 369 sufferers, in 2013 there were 13 outbreaks with 504 cases. In 2019, 262 cases of hepatitis were found at Depok City. Methods: This research uses Case Control design and analytic survey method. The respondents of this study were elementary school students who were affected and not affected by Hepatitis A, amounted to 60 respondents. Results: The results showed the respondents hand washing behaviour is not good, amounted to 34 respondents (56.7%), junk food consumption is high, amounted to 30 respondents (50%). and respondents who are not knowledgeable amounted to 46 respondents (76.7%). The analysis of Bivariate shows that the relationship between hand washing behaviour (P-value = 0.037), junk food consumption (P-value = 0.039), knowledge (P-value = 0.015) with the incidence of hepatitis A is significant. Conclusion: There is significant relationship between all independent variable (hand washing behaviour, and junk food consumption and knowledge) with the incidence of hepatitis A.

Introduction: Musculoskeletal Disorder (MSD) is an injury that affects the movement of human body systems such as muscles, tendons, ligaments, nerves, blood vessels, and others. The prevalence of MSDs in Indonesia is 11.9% based on diagnosis and 24.7% based on symptoms. MSDs prevalence is 31.2% based on employment among farmers, fishermen, and workers. Methods: The design of this study has been included in observational research using a quantitative approach with Cross-Sectional study. Results: MSDs can appear based on gender, age, educational status, and non-medical supporting professions. Older workers tend to be at risk of developing MSDs complaints. Conclusion: To reduce the risk of complaints, work facilities such as ergonomic chairs and tables can be provided along with extension of work intervals. Workers must take advantage of good rest periods. There is no relationship between work tenure and MSDs complaints. If the working period is long, then it can cause boredom and the endurance of muscles as well as bones physically.