Your browser doesn't support javascript.
Patterns and descriptors of COVID-19 testing and lab-confirmed COVID-19 incidence in Manitoba, Canada, March 2020-May 2021: A population-based study.
Righolt, Christiaan H; Zhang, Geng; Sever, Emrah; Wilkinson, Krista; Mahmud, Salaheddin M.
  • Righolt CH; Vaccine and Drug Evaluation Centre, Department of Community Health Sciences, University of Manitoba, 337-750 McDermot Avenue, Winnipeg MB, R3E 0T5 Canada.
  • Zhang G; Vaccine and Drug Evaluation Centre, Department of Community Health Sciences, University of Manitoba, 337-750 McDermot Avenue, Winnipeg MB, R3E 0T5 Canada.
  • Sever E; Vaccine and Drug Evaluation Centre, Department of Community Health Sciences, University of Manitoba, 337-750 McDermot Avenue, Winnipeg MB, R3E 0T5 Canada.
  • Wilkinson K; Vaccine and Drug Evaluation Centre, Department of Community Health Sciences, University of Manitoba, 337-750 McDermot Avenue, Winnipeg MB, R3E 0T5 Canada.
  • Mahmud SM; Vaccine and Drug Evaluation Centre, Department of Community Health Sciences, University of Manitoba, 337-750 McDermot Avenue, Winnipeg MB, R3E 0T5 Canada.
Lancet Reg Health Am ; 2: 100038, 2021 Oct.
Article in English | MEDLINE | ID: covidwho-1461650
ABSTRACT

BACKGROUND:

We studied lab-confirmed COVID-19 infection (LCCI) testing, incidence, and severity.

METHODS:

We included all Manitoba residents and limited our severity analysis to LCCI patients. We calculated testing, incidence and vaccination rates between March 8, 2020 and June 1, 2021. We estimated the association between patient characteristics and testing (rate ratio [RR]; Poisson regression), including the reason for testing (screening, symptomatic, contact/outbreak asymptomatic), incidence (hazard ratio [HR]; Cox regression), and severity (prevalence ratio [PR], Cox regression).

FINDINGS:

The overall testing rate during the second/third wave was 570/1,000 person-years, with an LCCI rate of 50/1,000 person-years. The secondary attack rate during the second/third wave was 16%. Across regions, young children (<10) had the lowest positivity for symptomatic testing, the highest positivity for asymptomatic testing, and the highest risk of LCCI as asymptomatic contact. People in the lowest income quintile had the highest risk of LCCI, 1.3-6x the hazard of those in the highest income quintile. Long-term care (LTC) residents were particularly affected in the second wave with HRs>10 for asymptomatic residents.

INTERPRETATION:

Although the severity of LCCI in children was low, they have a high risk of asymptomatic positivity. The groups most vulnerable to LCCI, who should remain a focus of public health, were residents of Manitoba's North, LTC facilities, and low-income neighbourhoods.

FUNDING:

Canada Research Chair Program.
Keywords

Full text: Available Collection: International databases Database: MEDLINE Type of study: Incidence study / Randomized controlled trials / Risk factors Topics: Long Covid / Vaccines Language: English Journal: Lancet Reg Health Am Year: 2021 Document Type: Article

Similar

MEDLINE

...
LILACS

LIS


Full text: Available Collection: International databases Database: MEDLINE Type of study: Incidence study / Randomized controlled trials / Risk factors Topics: Long Covid / Vaccines Language: English Journal: Lancet Reg Health Am Year: 2021 Document Type: Article