Parameter | Primary School Best-Estimate [Range] | Secondary School Best-Estimate [Range] | Reference |
---|---|---|---|
No. of educational institutions in US 2015–2016 | 88,665 | 26,986 | NCESa |
No. of Index case/s | 1 | 1 | Assumption |
Quanta generation rate (quanta / hour) | 1925 [1185–3345] | 2765 [1430–5140] | This Studyb |
No. of enrolled students before outbreak | 513 [175–825] | 854 [245–1394] | NCESc |
Infection period in school (day) | 3 [2–4] | 3 [2–4] | Literatured |
Portion of unvaccinated students | 9% [8–10%] | 9% [8–10%] | CDCe |
Portion of students with ≥2-dose vaccination | 91% [90–92%] | 91% [90–92%] | CDCe |
No. of students in infector’s classroom | 21 [18–26] | 23 [18–30] | SASSf |
Occupancy density of classroom (m2/person) | 4 [3–5] | 4 [3–5] | DOEg |
Occupancy density of common area (m2/person) | 1.39 [1.04–1.74] | 1.39 [1.04–1.74] | DOEg |
Average time spent in school (mins) | 400 [375–425] | 400 [375–425] | SASSh |
Average time spent in common area (mins) | 20 [15–30] | 30 [20–45] | NFSMIi |
Heating and cooling periods in US schools (day) | H: 200 & C: 90 | H: 200 & C: 90 | Assumptionj |
HVAC system type | See Table 4 | See Table 4 | CBECSk |
HVAC recirculation rate in classrooms (per hour) | 6.4 [3.3–8.5] | 6.4 [3.3–8.5] | Literaturel |
Outdoor air ventilation in classrooms (L/s-person) | 6.7 [4.0–9.5] | 6.7 [4.0–9.5] | ASHRAEm, |
Outdoor air ventilation in common area (L/s-person) | 4.9 [4.7–5.1] | 4.9 [4.7–5.1] | ASHRAEm |
HVAC runtime for applicable systems | 1 | 1 | Assumption |
Air filter removal efficiency (%) | 72% [44–86%] | 72% [44–86%] | NAFAn |
Infiltration rate (1/h) | 0.31 [0.12–0.49] | 0.31 [0.12–0.49] | DOEg |
Deposition rate of measles bio-aerosols (1/h) | 1.7 [1.0–2.7] | 1.7 [1.0–2.7] | Literatureo |
Inhalation rate (m3/day) | 12.96 [11.34–14.53] | 15.53 [13.93–17.45] | EPAp |