The World Health Organisation's director-general's remarks come after the team visiting China suggested a leak from a lab was 'very unlikely'
The joint €40 million programme will involve Armenia, Azerbaijan, Belarus, Georgia, Ukraine and Moldova.
The mission is expected to start next month and continue for four-to-five weeks.
According to an email obtained by the Associated Press, the WHO's anti-coronavirus measures have not been enough to stop the spread of the virus among its staff.
The number of children sickened by measles in 2019 was the highest in 23 years, according to new data published by the World Health Organization and the US Centers for Disease Control and Prevention.