This cluster of papers explores the impact of child care on infectious diseases, with a focus on respiratory tract infections, immunostimulants, teething symptoms, and the effectiveness of infection control measures. It investigates the use of bacterial lysates and other preventive strategies to reduce the burden of recurrent respiratory infections in children attending daycare. The research also delves into the role of health promotion and immunomodulatory interventions in mitigating infectious disease risks associated with child care settings.