The Health Board (Terviseamet) is monitoring the close contacts of a Polish national temporarily based in Viljandi County who recently tested positive for COVID-19.
The Health Board has said a total of 18 people have been in contact with the individual, who is working on a short-term basis in Viljandi County, regional daily newspaper Sakala reported.
The 18 people are all work colleagues. A "close contact" is defined as any person who has been within two meters of an infected person for a minimum of 15 minutes.
The Health Board says they have no reason to believe the individual has been further afield during the virus' infection period and did not attend concerts held in Viljandi town at the weekend. The risk of a localized outbreak in Viljandi is minimal.
Recorded coronavirus cases in Viljandi County numbered 25 as of July 27, according to official statistics, though this is since the pandemic began.
There are an estimated 23 active COVID-19 cases nationwide at the time of writing, out of a total 2,034 diagnosed since the end of February when the first case appeared in Estonia.
At the start of the pandemic in March, outbreaks occurred on the island of Saaremaa and in Võru County as the result of small numbers of infected people circulating at public events.
Editor: Andrew Whyte