But 32 were in staff who had been working on premises at the headquarters building, where more than 2000 people usually work and the agency says it has put in place strict hygiene, screening and other prevention measures.
In the email, which was sent to staff at the weekend, Raul Thomas, who heads business operations at WHO, noted that five people — four on the same team and one who had contact with them— had tested positive for Covid-19. That could indicate that basic infection control and social distancing procedures in place may have been broken.
"We have had some cases that have been associated with the premises. We do have some cases in the last week that are linked together," Maria Van Kerkhove, WHO's technical lead on Covid-19, confirmed.
Of the linked cases, she added: "There are possible ways in which they were infected outside of the premises. So we're still doing the epidemiologic investigation with that."
Two weeks ago, Van Kerkhove had said there had been no transmission at headquarters to that point but added that the agency was monitoring it. WHO, which is coordinating the global response to the pandemic, had previously said that staffers had been infected but never provided a number or details.
According to the email, 49 of the overall cases had occurred in the last eight weeks. The timing of the other 16 cases was not clear.
- AP