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Keeping mozzies away: Citronella works, but not ultrasonic repellents
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Timothy Goh
As the number of dengue cases recorded here reaches nearly 10,000 in the first five months of the year, The Straits Times speaks to experts to find out if items such as citronella candles and ultrasonic repellents are effective in keeping mosquitoes away, and what sorts of things attract mosquitoes.
