[Occupational hygiene under current conditions of decentralized seed disinfection].
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The article describes the intermediate-level course in public health started in Venezuela thirty years ago to fill a need for trained personnel to work in clinics for expectant mothers, schoolchildren, and sufferers from tuberculosis and other diseases at health units and centers. The course have evolved with changing health conditions in the country, and the school's graduates are increasingly aware of and conversant with the health and social problems of the population. The course is now designed to turn out health administrators who can run health services and institutions of intermediate level like health units and district health centers and services, or functions as assistants or deputies to heads of services of greater complexity such as regional hospitals, epidemiology units, etc. The course is required, together with some employment experience in health services, for admission to the Advanced Course in Public Health.
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When bacteria were isolated from disinfectant solutions of dosing apparatuses their resistance observed in those solutions is rapidly lost during few passages on nutrient agar (Table 1). Bacteria in tap-water, too, show an increased resistance against that disinfectant (Table 2) but it could be reversed by EDTA (Table 3). Therefore, the resistance of bacteria observed in tap-water and disinfectant solution is not determined genetically but results from a temporary adaptation which may be caused by an increased secretion of slime. This resistance is only observed in solution but not after application of the disinfectant to surfaces; it is not dependent from the dosing apparatus but from the product used. Only one species (Corynebacterium rubrum) which occasionally was found showed a primarily increased resistance which is stable during isolation.