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A sewage surveillance system providing municipal authorities with data about the presence of the novel coronavirus has found 31 per cent of samples collected from open drain canals since November 28 are registering as positive.

Recently, more than 40,000 people living in around a dozen suburbs in Sydney were asked to get tested for Covid-19 after traces of the novel coronavirus were found in sewage water in the areas despite no new local cases.

The Karnataka government is introducing a city sewage surveillance system in Bengaluru that will help officials track the novel coronavirus at an early stage, even among asymptomatic persons.