Emerg Infect Dis. 2021 May;27(5):1330-1342. doi: 10.3201/eid2705.204949. Epub 2021 Mar 3.
During the ongoing coronavirus disease (COVID-19) pandemic, farmworkers in the United States are considered essential personnel and continue in-person work. We conducted prospective surveillance for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and antibody prevalence among farmworkers in Salinas Valley, California, during June 15-November 30, 2020. We observed 22.1% (1,514/6,864) positivity for SARS-CoV-2 infection among farmworkers compared with 17.2% (1,255/7,305) among other adults from the same communities (risk ratio 1.29, 95% CI 1.20-1.37). In a nested study enrolling 1,115 farmworkers, prevalence of current infection was 27.7% among farmworkers reporting >1 COVID-19 symptom and 7.2% among farmworkers without symptoms (adjusted odds ratio 4.16, 95% CI 2.85-6.06). Prevalence of SARS-CoV-2 antibodies increased from 10.5% (95% CI 6.0%-18.4%) during July 16-August 31 to 21.2% (95% CI 16.6%-27.4%) during November 1-30. High SARS-CoV-2 infection prevalence among farmworkers underscores the need for vaccination and other preventive interventions.
在持续的冠状病毒病（COVID-19）大流行期间，美国的农场工人被认为是必不可少的人员，并继续进行现场工作。我们在 2020 年 6 月 15 日至 11 月 30 日期间对加利福尼亚州萨利纳斯谷的农场工人进行了严重急性呼吸系统综合症冠状病毒 2（SARS-CoV-2）感染和抗体流行情况的前瞻性监测。我们观察到农场工人中 SARS-CoV-2 感染的阳性率为 22.1%（1514/6864），而来自同一社区的其他成年人中为 17.2%（1255/7305）（风险比 1.29，95%置信区间 1.20-1.37）。在一项纳入 1115 名农场工人的嵌套研究中，报告 >1 种 COVID-19 症状的农场工人中当前感染的患病率为 27.7%，无症状的农场工人中为 7.2%（调整后的优势比 4.16，95%置信区间 2.85-6.06）。SARS-CoV-2 抗体的患病率从 7 月 16 日至 8 月 31 日的 10.5%（95%置信区间 6.0%-18.4%）增加到 11 月 1 日至 30 日的 21.2%（95%置信区间 16.6%-27.4%）。农场工人中 SARS-CoV-2 感染的高患病率强调了接种疫苗和其他预防措施的必要性。
