(Corrects Aug. 6 story to clarify that B.1.621 is not related to the Kappa variant of the coronavirus)
(Reuters) -Seven residents of a nursing home in Belgium have died after being infected with a variant of the coronavirus first detected in Colombia despite being fully vaccinated, the virology team that conducted tests said on Friday.
The virology team said the residents had been infected with the B.1.621 lineage of COVID-19 that was first identified in Colombia and has been detected in recent weeks in the United States but cases in Europe have been rare.
The European Centre for Disease Prevention and Control has listed B.1.621 as a “variant of interest,” meaning that preliminary evidence suggests a significant impact on transmissibility, severity or immunity. The variant has yet to receive a Greek letter name under the World Health Organization’s system for designating the most closely watched coronavirus variants.
The seven people who died at the nursing home in the Belgian town of Zaventem, near Brussels, were all in their 80s or 90s, and some of them were already in a poor physical condition, said Marc Van Ranst, a virologist at the University of Leuven which conducted tests on the virus found at the nursing home.
"It is worrisome," Van Ranst said, commenting on the fact that the residents died despite being fully vaccinated against COVID-19.
So far, scientists do not know if the B.1.621 lineage is more transmissible than other variants of the coronavirus, he said.
In Belgium, B.1.621 currently accounts for less than 1% of known cases of COVID-19, he said, compared to 2% of cases in the United States and more than that in Florida.
At the nursing home in Zaventem, 21 residents were infected with the variant along with several members of staff, Van Ranst told Reuters. The infected staff experienced only mild symptoms.
Van Ranst said the dominant coronavirus variant in Belgium with around 95% of infections is the Delta, first discovered in India, followed by the Alpha that was previously dominant in Britain.
Additional tests will be run on Friday to rule out any possibility that the nursing home residents died from a different variant of the virus or a different respiratory disease, Van Ranst said.
"It is unlikely but not impossible," he said.
(Reporting by Sabine Siebold; Editing by Susan Fenton)