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Covid-19 වැනි වයිරස ආසාදිතයකුගේ දේහය තුල එම වයිරසට එරෙහිව සිදුවන අනුවර්තී ප්රතිශක්තියේදී වසා සෛල ක්රියා කරන ආකාරය කෙටියෙන් පැහැදිලි කරන්න.
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