不過,香港感染及傳染病醫學會名譽司庫徐詩駿醫生對香港本地媒體指出,向政府領有飼養牌照的寵物犬,只要身體健康,並已接種所有指定疫苗——包括狂犬病(瘋狗症)疫苗——再加上每月下藥杜蟲,在餐廳傳播疾病的風險很低。
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Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.