Volume 27, Number 4—April 2021
Synopsis
Characteristics of SARS-CoV-2 Transmission among Meat Processing Workers in Nebraska, USA, and Effectiveness of Risk Mitigation Measures
Table 2
Comparisons of the incidence of severe acute respiratory syndrome coronavirus 2 infection before and after mask or physical barrier interventions or both among employees in 13 meatpacking facilities in Nebraska, April–July 2020*
Facility | Incidence /1,000 persons /d |
||
---|---|---|---|
<10 d after final intervention | 10 d after final intervention | p value for difference | |
Facilities that initiated a universal mask policy >10 d before physical barriers | |||
A | 7.27 | 0.33 | <0.001 |
B | 3.21 | 0.69 | <0.001 |
C | 3.46 | 0.27 | <0.001 |
D | 3.64 | 0.15 | 0.072 |
E |
0.48 |
2.09 |
0.008 |
Facilities that initiated a universal mask policy and physical barriers <10 d of each other | |||
F | 17.16 | 0.58 | <0.001 |
G | 2.49 | 1.27 | 0.002 |
H | 4.08 | 0.78 | <0.001 |
I | 6.82 | 1.40 | <0.001 |
J | 2.19 | 0.059 | <0.001 |
K |
0.65 |
1.90 |
0.180 |
Facilities that only initiated a universal mask policy | |||
L | 3.2 | 2.87 | 0.745 |
M |
3.29 |
3.178 |
0.944 |
*For facilities that initiated both a universal mask policy and physical barriers, date of last intervention was defined as start date of latter intervention (i.e., if physical barriers were initiated first, final intervention date was date of mask policy initiation). For facilities that initiated only masking, final intervention date was the initiation date. |