SARS-CoV-2 Theta variant

Theta variant, also known as lineage P.3, is one of the variants of SARS-CoV-2, the virus that causes COVID-19. The variant was first identified in the Philippines on February 18, 2021, when two mutations of concern were detected in Central Visayas. It was detected in Japan on March 12, 2021, when a traveler from the Philippines arrived at Narita International Airport in Tokyo.

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It is distinct from those first discovered in the United Kingdom, South Africa, and Brazil, and is thought to pose a similar threat. The variant is more resistant to neutralizing antibodies, including those gained through vaccination, like how the South African and Brazilian variants appear to be.

Under the simplified naming scheme proposed by the World Health Organization, P.3 has been labeled Theta variant, and was considered a variant of interest (VOI), but not a variant of concern.

As of July 2021, Theta is no longer considered as a variant of interest by the WHO.

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