Pre-vaccination RT-PCR negative contacts in workplace settings show high, SARS COV-2 neutralizing antibody levels by Ridma P Karunathilake, Sameera Hewage, Gihani Vidanapathirana, Athula Kumara, Prabhath Ranasinghe, Faseeha Noordeen, Indika Gawarammana, Champa N Ratnatunga

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