Correction: IgG antibodies to SARS-CoV-2 in asymptomatic blood donors at two time points in Karachi. by Muhammad Hasan, Bushra Moiz, Shama Qaiser, Kiran Iqbal Masood, Zara Ghous, Areeba Hussain, Natasha Ali, J Pedro Simas, Marc Veldhoen, Paula Alves, Syed Hani Abidi, Kulsoom Ghias, Erum Khan, Zahra Hasan

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