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