Nucleic acid extraction from nasopharyngeal samples was performed using the Extracta Kit—Viral RNA and DNA (MVXA‐ P016FAST) (Loccus, Brazil) using an Extracta32 instrument (Loccus) as previously described (15). Laboratory diagnosis was based on one-step reverse transcription followed by RT-PCR using the INFA/INFB/SC2 kit (Bio-Manguinhos, Brazil) as described previously (15).
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