Provincial Respiratory Surveillance Report

COVID-19 and Seasonal Influenza


This report provides a current epidemiological update on the intensity and severity of COVID-19 in Manitoba. Surveillance and administrative data include laboratory, public health case and contact tracing investigations, hospitalization and mortality data. Data are presented at the provincial and regional level; and include a focussed review on the disproportional impact of COVID-19 on various populations in the province.

Epidemiology and Surveillance also continues to monitor the activity of seasonal influenza in Manitoba during this pandemic. During the 2020–2021 influenza season, routine reporting of seasonal influenza is included in this weekly report.

In this weekly respiratory surveillance report, we provide regular updates about the current activity of COVID-19 and seasonal influenza in Manitoba with overall objectives:

Data are reported with a one-week delay for increased data accuracy, completeness and reliability. More analyses continue to be conducted and will be added to this report as available. It is published online at approximately 10:00am every Monday.


Week 13 (March 28 – April 3)

About epidemiological week

Data extracted up to 4:00 am on April 9, 2021
Next reporting date: April 19, 2021

COVID-19: Decreased Activity

In Week 13, there were 497 laboratory-confirmed COVID-19 cases reported in Manitoba, a decrease from 570 in the previous week. The volume of lab tests decreased to on average 1,722 people tested for COVID-19 per day compared to 2,053 in the previous week, and the positivity rate of lab tests was 4.6%, an inecrease from 4.2% in the previous week.

In an examination of the 497 cases reported this week, majority (47%) were reported from the Winnipeg Regional Health and 39% were reported from the Northern Health Region. The remaining cases were reported from Prairie Mountain Health Authority (9%), Southern Health - Santé Sud Regional Health Authority (4%) and Interlake-Eastern Regional Health Authority (1%).

A total of 363 Variants of Concern (VOC) cases have been confirmed by screening or sequencing tests.

Overall, older adults and those with underlying illnesses are at higher risk for severe outcomes as a result of COVID-19 infection.

As of April 3, a total of 232,109 doses of COVID19 vaccines have been administered and 166,693 residents in Manitoba have been immunized with at least one dose.

Cases

About cases

  • New cases: 497
  • Total cases: 34,424
  • Recovered cases: 32,759
More Analyses

Testing

About testing

This week

  • Average daily specimens: 1,722
  • Weekly positivity rate: 4.6%

Total

  • Tested people: 396,086
  • Population tested: 29%
  • Specimens tested: 589,637
  • Positivity rate: 6.3%
More Analyses

Severity

About severity

Severe outcomes associated with COVID-19:

  • Hospitalizations: 2,436
    • ICU admissions: 467
  • Deaths: 946
More Analyses

Outbreaks

About outbreaks

COVID-19 outbreaks: 210

  • Outbreaks in long-term care facilities: 109
  • Outbreaks in schools: 3
More Analyses

Exposure

About exposure

Source of infection in cases (% of total)

  • Travel: 1.3%
  • Close contact to cases: 52.7%
  • Unknown: 23.1%
  • Pending: 22.9%

Close contacts

  • Top contact type: Household exposure
More Analyses

Risk Factors

About risk factors

  • Pregnant cases: 380
  • Health care workers**: 2,012
  • Deceased Health care workers: 2
  • Recovered health care workers: 2,004
More Analyses

Symptoms

About symptoms

Symptomatic cases: 71.3%

Top symptoms (% of reports)

  • Cough: 43.8%
  • Headache: 37.2%
  • Fever: 29.6%
  • Muscle pain (myalgia): 27.6%
  • Sore Throat: 26.1%
More Analyses

Seasonal Influenza: Low Activity

A large number of respiratory specimens continued to be tested for seasonal influenza. There were no laboratory-confirmed influenza cases reported in Manitoba in Week 13.

As of April 3, 31.7% of residents in Manitoba have been immunized with seasonal influenza vaccines.

Influenza Cases

About cases

New cases this week

  • Influenza A: 0
  • Influenza B: 0

Total cases from September 1, 2020

  • Influenza A: 0
  • Influenza B: 1

Syndromic Indicators: Low Activity

The respiratory activity levels in the community, primary care and emergency rooms continued to be low for this time of a year. The number of respiratory outbreaks reported that were not due to COVID-19 remains low.

FluWatchers

About FluWatchers

Participants reporting: 588

Reporting fever and cough: 0%

Check Trend

Physician Visits

About sentinal physicians

Influenza Like Illness (ILI) Visits to sentinel physicians: 1.2%

Check Trend

Antiviral

About Antiviral

Units of antiviral dispensed from pharmacies: 3

ED Visits

About emergency room visits

Average daily respiratory visits to emergency department (ED): 85

Check Trend

Important Notes

  1. Data about COVID-19 cases and contacts aswell as influenza cases are extracted from PHIMS.
  2. Numbers are subject to change. Missed events in the current report due to reporting delays will be included in later reports when data become available.
  3. *ICU admissions were also included in hospitalizations.
  4. **Health care workers include personnels in hospitals, long-term care settings, community health clinics and services (including agency staff), and diagnostic/laboratory services.

Cases

Figure 1. Cases of COVID-19 by Week of Public Health Report Date, Manitoba, 2020 – 2021

Note. Deaths due to COVID-19 were aligned by week of death date.
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Figure 2. COVID-19 Cases of Variants of Concern (VOC) and Percentage of VOC cases in All Cases by Week of Public Health Report Date, Manitoba, 2020 – 2021


Figure 3. Cases of COVID-19 by Sex and Age Group, Manitoba, 2020 – 2021

Figure 4. Cases of COVID-19 by Health Region and Public Health Report Date, Manitoba, 2020 – 2021

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Table 1. Cases of COVID-19 by Health Region, Manitoba, 2020 – 2021

Health Region Cases Percentage
Winnipeg RHA 18722 54.4%
Southern Health-Santé Sud 4937 14.3%
Interlake-Eastern RHA 2485 7.2%
Prairie Mountain Health 2210 6.4%
Northern Health Region 6070 17.6%

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Testing

Figure 5. Average Daily Testing Volume and Positivity (%) for COVID-19 by Week of Specimen Receiving Date, Manitoba, 2020 – 2021

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Table 2. Cumulative National Testing Volume and Positivity (%) for COVID-19 by Province/Territory, Canada, 2020 – 2021

Province Confirmed Cases Tests Completed Test Rate in Population (Estimated %) Positivity Rate (Estimated %)
Alberta 150,288 3,710,225 85.3% 4.1%
British Columbia 101,954 2,196,645 43.5% 4.6%
Manitoba 34,262 592,786 43.4% 5.8%
New Brunswick 1,632 266,785 34.5% 0.6%
Newfoundland and Labrador 1,020 221,205 42.3% 0.5%
Northwest Territories 42 16,085 35.8% 0.3%
Nova Scotia 1,728 430,732 44.6% 0.4%
Nunavut 395 9,864 25.5% 4.0%
Ontario 355,549 12,462,329 86.0% 2.9%
Prince Edward Island 160 126,089 81.0% 0.1%
Quebec 313,676 7,201,569 85.2% 4.4%
Saskatchewan 34,043 669,314 57.2% 5.1%
Yukon 74 8,563 21.1% 0.9%
Canada 994,836 27,912,267 74.6% 3.6%

Note. National testing data are collected daily from the national Coronavirus disease (COVID-19) Outbreak update webpage.

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Severity

Figure 6. Severe Outcomes of COVID-19 by Week of Public Health Report Date, Manitoba, 2020 – 2021

Note. ICU admissions are not included in the hospital admissions.

Figure 7. Age Distribution of Severe COVID-19 Cases Compared to All Cases, Manitoba, 2020 – 2021

Figure 8. Percentage of COVID-19 Cases With Underlying Illnesses, Manitoba, 2020 – 2021

Note. Musculoskeletal illnesses include: osteoporosis, osteoarthritis, juvenile idiopathic arthritis, gout and crystal Arthropathies; COPD-chronic obstructive pulmonary disease; CVD-cardiovascular disease; Other CVDs include: ischemic heart disease, heart failure, acute myocardial infarction, and stroke; Other chronic conditions include: parkinson’s disease, multiple sclerosis, alzheimer’s disease and epilepsy. About definitions of chronic conditions

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Risk Factors

Table 3. Source of Infection in Health Care Workers with Non-missing Information, Manitoba, 2020 – 2021

Source of infection Cases Percentage
Close contact of known case 1198 59.5%
Pending 186 9.2%
Travel 20 1%
Unknown 608 30.2%
All Cases 2012

Table 4. Roles of Health Care Workers with Non-missing Information, Manitoba, 2020 – 2021

Role Cases Percentage
Allied Health, Health Professionals, and Support Staff 1169 58.1%
Nurse/Licensed Practical Nurse 573 28.5%
Not identified 152 7.6%
Physician/Physician in training 75 3.7%
First Responder 43 2.1%
All Cases 2012

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Outbreaks

Figure 9. Weekly Respiratory and COVID-19 Outbreaks, Manitoba, 2018 – 2021

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Contacts

Table 5. COVID-19 Contact Summary Table, Manitoba, 2020 – 2021

Regional Health Authority Active Cases Median Contacts Min contacts Max contacts
Northern Health 380 0 0 25
Winnipeg Health 222 3 0 57
Prairie Mountain Health 45 2 0 19
Interlake-Eastern Health 9 0 0 8
Southern Health - Sante Sud 5 1 0 33

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Symptoms

Figure 10. Percentage of Symptoms Reported by COVID-19 Cases, Manitoba, 2020 – 2021

Note: Other symptoms include those less common symptoms such as sweating, runny eyes, itchy throat, etc.

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FluWatchers

Figure 11. Weekly FluWatchers Participants and Percentage Reporting Fever and Cough, Manitoba, 2021

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Physician Visits

Figure 12. Weekly Percentage of ILI Related Visits to Sentinel Physicians, Manitoba, 2021

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ED Visits

Figure 13. Weekly Respiratory Visits to Emergency Department, Winnipeg Regional Health Authority, Manitoba, 2018 – 2021

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Epidemiology and Surveillance

epiCOVID@gov.mb.ca

Other Epidemiology and Surveillance reports

https://www.gov.mb.ca/health/publichealth/surveillance/index.html