Late detection of the clusters' index cases delayed isolation of further local cases.

But as fewer people return, local cases have become the majority.

The footwear impression Mary Beth recovered didn't match any local cases.

All the local cases involve people who have been overseas and travelled to South Africa.

Thailand reported two local cases of Covid-19 in September.

Another of Saturday's new local cases was an educator who works at this centre, NSW Health said.

On April 15, the Chinese capital reported three local cases, all of which were linked to an imported infection.

Five further local cases are members of the same household in Sydney's south west, NSW Health said in a statement.

However, information about local cases of meningitis and measles and the need for prompt treatment and vaccination are equally valued.

In NSW, that state recorded five new local cases on Friday but these were all linked to a known cluster.

The man's death in a remote part of the country had baffled authorities, given there were no other local cases.

One new case announced on Monday cannot be linked to any known case, while eight were linked to other local cases.

For the first time since the start of the coronavirus outbreak, China has recorded a day with no new local cases.

Vietnam back open for business With no local cases reported in almost a month, Vietnam has reopened businesses and tourist attractions.

However China reported fewer than 10 new local cases a day on average last month, and its researchers are now looking abroad.

In New South Wales, community transmission is on the rise, with more than 150 local cases diagnosed over the past two weeks.