The government on Sunday urged the public not to let their guard down against Covid-19, saying there's still a chance cases could rebound.

While the fifth wave of infections has been substantially contained, people shouldn't "overlook the risk of epidemic rebound following the gradual resumption of social and economic activities," a spokesman said.

In a statement, the spokesman said recent infection clusters in bars and restaurants were not unexpected as social activity increases.

Authorities also warned people against lying about rapid test results, saying doing so is a criminal offence.

The Centre for Health Protection has so far found six people suspected of deliberately providing fake results, and police have arrested three of them.

Authorities added since April, all those who tested positive using rapid tests have been asked to undergo a PCR test for confirmation when testing capacity permits.

Meanwhile, health authorities found one positive case among the 565 residents in Block 6 of Richland Gardens in Kowloon Bay after an overnight lockdown.