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A STUDY of causes of absenteeism among New Haven school children has shown respiratory tract infections to be the major cause of absence for three or more consecutive school days.' In the present study, an attempt was made to control these diseases by ultraviolet irradiation of the upper air in classrooms. Ultraviolet light is an effective bactericidal agent and has been used to. control infection in operating rooms, pediatric and contagious disease wards, schools, military barracks, and children's institutions.2 Nevertheless, considerably different energy concentrations are necessary to inhibit or kill various bacteria, fungi, and viruses8' 4 and its effectiveness when relative humidity is over 50-60 per cent is controversial.5-7 Small particles, such as droplet nuclei, are more susceptible to irradiation than larger particles, such as dust or lint.2 Intensities of ultraviolet light necessary for germicidal effect are damaging to human skin and conjunctiva, thus restricting its use to upper air, ventilation ducts and barriers at entrances to rooms or isolation cubicles.8 Furthermore, results reported to date have not always

The Effect of Ultraviolet Light upon Absenteeism from Upper Respiratory Infections in New Haven Schools