Incubators are indispensable for babies, especially who were born immature. But the circumstances of incubators such as temperature and humidity are favorable for bacteria to proliferate. Especially, the water in the humidifiers of incubators is easily contaminated by bacteria.
This study was intended to investigate whether the water in the humidifiers is to be contaminated or not by bacteria using different waters: 1) sterile distilled water, 2) sterile distilled water with the addition of Silvita (a metal of silver) and 3) purified water prepared in the hospital with the addition of Silvita. The waters in the humidifiers were exchange every day, and samples were obtained before and after the exchange, and sent to the laboratory immediately for examination.
Results of experiments are as follows.
1. The decreasing rate of number of bacteria in the water of humidifiers with the addition of Silvita were 66% in 15 minutes, 91% in 30 minutes, 99% in 60 minutes and 100% in 24 hours after use.
2. Bacteria were not detected in the sterile distilled water those were changed every 24 hours with or without the addition of Silvita.
3. The distilled water made in the hospital was not appropriate for use, because, even if it contained Silvita, microbes were detected of the certain bacterial specimens and Gram-negative bacillus after 24 hours.
Those results indicate that incubators, which were previously sterilized, is not contaminated by the sterile water in the humidifiers, if the water is exchanged within every 24 hours in the presence of Silvita.
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