The decision applies to Northern Macedonia, Croatia, Bulgaria and Romania, epidemiologist Darija Kisic Tepavcevic told RTS.
It was also decided to stop the restrictions that applied to the citizens of Montenegro. All measures take effect from tomorrow.
The PCR test is not required for Serbian citizens coming from these countries.
North Macedonia's president on Thursday handed a mandate to pro-Western ex-prime minister Zoran Zaev to form a new government after his party bloc narrowly won a July 15 election.
"I will lead a government that will not ... veer away from the road leading to membership of the European Union after obtaining membership of NATO," Zaev said.
What explains this shift, from being the region that initially had among the fewest cases in Europe, to a surge?
Some country-specific reasons might explain individual cases, such as recent elections in Serbia and North Macedonia, or the government crisis in Kosovo, or protests in Montenegro and Serbia. However, none provides an overarching regional perspective.
Bulgaria had the opportunity to veto the talks between North Macedonia and the EU if it wanted to do so. However, this country did not do it. Moreover, it is working towards our EU accession, North Macedonia's former Premier and leader of the Social Democratic Union Zoran Zaev said in a TV interview.