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There are currently strains of covid 19 The World Health Organization has highlighted four strains, namely the alpha virus strain. First species discovered in the UK beta virus The first was found in South Africa. First species discovered in Brazil First delta strain discovered in India
อ่านต่อได้ที่ โรงเรียนบ้านปลายคลองเพรง

gg, Jul 02 2021 on