Of the now twelve positive cases, eleven were reported in the Ludwigslust-Parchim district where the event took place, and one in the northeastern state’s capital of Schwerin.
According to a report in the local newspaper Schweriner Volkszeitung, the party mostly took place outdoors, but due to stormy weather continued inside of a garage.
Ludwigslust-Parchim's District Administrator Stefan Sternberg (SPD) appealed to local residents to pay attention to the social distancing regulations as well as to wear a face mask. Those who feel ill should not attend festivities, he added.
“This situation shows us once again that the coronavirus pandemic is not over,” Sternberg announced on the district's homepage. “It is still a serious situation. If we are not careful now, we will have rapidly increasing numbers.”
Approximately 200 contact people are in quarantine, and further tests are planned for Thursday afternoon.
Among the infected is also an employee of a job center in Hagenow, which has temporarily been closed.
Outbreaks around the country
The outbreak is one of several which has occurred around Germany over the last few days.
On Monday, 174 harvest workers at a farm in Mamming in Bavaria were confirmed to be infected with the coronavirus. Community members then received free testing for the virus.
Last week, authorities tried to track down contact people following an outbreak at a bar near Berlin's Alexanderplatz.
An outbreak was also reported on Wednesday in the district of Herzogtum Lauenburg in Schleswig-Holstein. A married couple were infected following visit with an acquaintance. Six other cases have been reported so far.
Throughout Germany, there have also been several reported cases originating from returning travellers, the majority of which come from southeastern Europe.
As of Thursday July 30th, Germany reported a total of 208,892 cases since the beginning of the epidemic, 191,287 who have recovered, according to data from Johns Hopkins University. There have been a total 9,137 deaths.