Correction: Ventilation during COVID-19 in a school for students with intellectual and developmental disabilities (IDD)

Abstract

[This corrects the article DOI: 10.1371/journal.pone.0291840.].

Fig 8. Positive PCR tests per room.

(A) Difference in PCR tests per room, normalized by room occupancy, between rooms with HVAC systems using MERV-11 (red) versus MERV-13 filters. Statistical comparison with the Mann-Whitney U-test (p<0.0012). (B) The time in each room where the ambient CO₂ ≥ 1,000 ppm was plotted against positive PCR tests in that room normalized by mean room occupancy. Rooms with CO₂ ≥ 1,000 ppm for less than 0.1 hour were excluded (lighter markers). MERV filter status for the building rooms is shown (red, MERV-11; blue, MERV-13). Spearman rank correlation (ρ = 0.2864) showed a weak correlation. (C) ACH versus positive SARS-CoV-2 PCR tests per room normalized to room occupancy. No correlation was found (ρ = 0.0876).