The German T-online.de portal on Friday reported that 10 German graduate students who had been on Pag island for an excursionhad returned infected with the coronavirus and are currently in self-isolation.
According to a spokesman for Goppingen district, north of Stuttgart, ten school leavers developed symptoms with respiratory problems.
Fifteen school leavers and 50 other people who have been in contact with them are also in self-isolation.
The head of Goppingen's public health institute, Heinz Pohler, underscored that more and more people returning from the Balkans were being diagnosed with the coronavirus disease.
Earlier in the day Slovenia's health authorities reported that despite controlling local transfers of the virus, recently "imported cases" had been detected again.
"In the past week, of the 21 imported cases, a little more than half were from Croatia," Marta Grgic Vitek from Slovenia's national public health institute said, adding that most of these cases were detected among young people, noting that one of the epicentres was Zrce Beach on Pag island, a popular spot for clubbing with often large gatherings of young people.