Investigators have struggled to find around 2,000 people wanted for testing, an effort complicated by public criticism of the clubgoers and concerns about discrimination against the LGBTQ community.

The app's compulsory use is raising concerns among privacy advocates, who say it is unclear how the data will be used and who stress that India lacks privacy laws to govern the app.

Australia has been one of the most successful countries in fighting the coronavirus pandemic, recording just 83 deaths and 6,700 cases.