Since Singapore reopened parts of its economy from June 19 when it entered phase two, workplace Covid-19 infections have risen.

Before phase two, 22 per cent of cases were from the work place.

Now it is 36 per cent.

Previously, 71 per cent of linked community cases were infected at home.

This rate has fallen to 41 per cent between June 19 and July 5.

Workers should work from home: Task force

National Development Minister Lawrence Wong urged people who can work from home to continue to do so and for employers to allow this "to further reduce transmission".

He was speaking at a multi-ministry task force press conference on July 7.

He said: "Anecdotally, I hear some people saying that their bosses are now asking them to go back to work. Well, that should not be the case."

He added that not going into the work place unless necessary is a precaution all employers should take.

Or else, if there is an infection in one person at the workplace, it will cause a large cluster.

Wong added: "Should a cluster form in the workplace, we may very well have to ask the employer to shut down their business operations temporarily; and then require every employee to be tested. This will impact the business."

Transmission from social interactions spiked a bit

Covid-19 transmissions due to social interactions has doubled from 1 to 2 per cent.

But these numbers are still low due to measures in place to restrict social interactions.

Currently, most of the new community unlinked cases were detected through routine testing.

Of these, almost three in five have no symptoms.

Half of these people are in the construction sector where workers are tested regularly.

Those who had no symptoms were also tested for antibodies.

Almost half of the unlinked cases were positive for antibodies, which would likely indicate an old and not current infection.

Cause for concern but no second wave yet

Health Minister Gan Kim Yong said at the press conference that people with symptoms and are unlinked to other cases form the group that is cause for concern as they reflect cases with unknown sources of infection.

The number of Covid-19 cases will go up, he added.

This is due to expanded testing to include patients aged 13 years and older who have acute respiratory infections.

He also said Singapore is not seeing a second wave of infections yet, "but the risk is always there".