The Malaysian authorities have tightened campaigning restrictions in several red-zone areas in Sabah, as the Covid-19 outbreak in the easternmost state worsens in a crucial week when a million eligible voters can head out to cast their votes in the state elections.

Malaysia saw a return to triple-digit daily infections on Wednesday, reporting 147 cases nationwide. Sabah, which is on Borneo island, continued to be the epicentre, with 134 of the cases coming from the state alone.

The nationwide tally yesterday dropped to 71 new cases, with 63 of them in Sabah.

There are three red zones - Lahad Datu, Tawau and Semporna - all of them on the east coast of Sabah.

The Election Commission on Wednesday said that campaigning in the red-zone areas is still allowed, but with tighter restrictions.

Only a maximum of two people are allowed into voters' homes during door-to-door campaigning, while only 30 people can gather in a single location for events such as campaign rallies.

The new restrictions come after two politicians from Umno, part of the federal ruling coalition, tested positive for the virus after returning from campaigning in Sabah.

Party supreme council member Mohd Razlan Rafii was hospitalised after testing positive, while information chief Shahril Hamdan revealed on Wednesday that he was infected with the virus.

The Malaysian government relaxed movement curbs on June 10, and the outbreak seemed relatively in control till the emergence of a Benteng cluster in the eastern district of Lahad Datu early this month. The outbreak originated in a detention centre where illegal immigrants were held in a crowded cell, resulting in the spread of the virus among detainees and police officers.

The outbreak has also spread to Tawau and Semporna.

The situation in Sabah has shown no signs of abating, with the state reporting the highest number of cases for more than three weeks consecutively.

In the past two weeks, it has seen 715 cases, which make up around 85 per cent of all the cases reported in Malaysia.

The country has reported 10,576 Covid-19 cases so far, with 133 deaths.

The Sabah state polls take place tomorrow, with 1.1 million registered voters eligible to take part. A staggering 447 candidates are vying for 73 state assembly seats.