"To our knowledge, researchers should start (antibody) testing on July 10," Veryga told the Ziniu Radijas radio station.
He noted, however, that it is not expected that a significant part of the population has had COVID-19.
"What further complicates the situation is that we don't know for how long that immunity may last and whether someone who has already had the coronavirus can be infected again and infect others," Veryga said.
"Researchers and clinicians currently have more questions than answers," he added.
Based on the latest official data, 1,733 coronavirus cases have been confirmed in Lithuania so far.