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  1. 1621
  2. 1622
    “…Here we describe a nationwide campaign to monitor SARS-CoV-2 in the wastewater of 159 counties in 40 U.S. states, covering 13% of the U.S. population from February 18 to June 2, 2020. Out of 1,751 total samples analyzed, 846 samples were positive for SARS-CoV-2 RNA, with overall viral concentrations declining from April to May. …”
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  3. 1623
  4. 1624
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  9. 1629
    “…Following 110 days of no new confirmed cases of COVID-19 in Tianjin Municipality, a case was confirmed on June 17, 2020. A total of 136 local cases had been reported previously. …”
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  10. 1630
  11. 1631
    por Muzart, Jacques
    Publicado 2021
    “…This account highlights the literature published since June 2018, completing previous reviews by the author.…”
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  12. 1632
    “…Distribution of household-clustered COVID-19 cases in Fulton county between June, 2020 and April 2021 [Image: see text] Figure 2. …”
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  13. 1633
    “…DESIGN: We abstracted data from Georgia’s State Electronic Notifiable Disease Surveillance System on all 10 437 laboratory-confirmed COVID-19 cases among children aged 0–18 years during 30 March 2020 to 6 June 2021. We examined case rates, testing rates and percent positivity by school-aged groupings, namely: preschool (0–4 years), elementary school (5–10 years), middle school (11–13 years), and high school (14–18 years) and compared these data among school-aged children with those in the adult population (19 years and older). …”
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  14. 1634
  15. 1635
    “…A March–June 2021 representative serosurvey among Sitakunda subdistrict (Chattogram, Bangladesh) residents found an adjusted prevalence of severe acute respiratory syndrome coronavirus 2 antibodies of 64.1% (95% credible interval 60.0%–68.1%). …”
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  16. 1636
  17. 1637
  18. 1638
    “…BACKGROUND/PURPOSE: This population-based study aimed to compare the accuracy of Rapid antigen detection (RAD) and reverse transcription-polymerase chain reaction (RT-PCR) assays for diagnosing individuals infected with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) during the COVID-19 outbreak in Taipei, from May to June 2021. METHODS: In response to the outbreak of COVID-19 in mid-May 2021, Taipei City Hospital set up 12 citywide proactive community testing (PCT) stations for early identification of infected individuals from May 17 to June 20, 2021. …”
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  19. 1639
  20. 1640
    “…BACKGROUND: Nine migrant agricultural workers died in Ontario, Canada, between January 2020 and June 2021. METHODS: To better understand the factors that contributed to the deaths of these migrant agricultural workers, we used a modified qualitative descriptive approach. …”
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