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 17 (April 25 – May 1)

About epidemiological week

Data extracted up to 4:00 am on May 7, 2021
Next reporting date: May 17, 2021

COVID-19: High Activity

In Week 17, there were 1,688 laboratory-confirmed COVID-19 cases reported in Manitoba, an increase from 1,456 in the previous week. The volume of lab tests increased to on average 3,426 people tested for COVID-19 per day compared to 3,117 in the previous week, and the positivity rate of lab tests was 7.6%, an increase from 7.0% in the previous week.

In the 1,688 cases reported this week, majority (70%) were reported from the Winnipeg Regional Health and 14% were reported from the Prairie Mountain Health Authority. The remaining cases were reported from Southern Health - Santé Sud Regional Health Authority (7%), Interlake-Eastern Regional Health Authority (5%) and Northern Health Region (4%).

This week, 1146 cases of variants of concern (VOCs) have been reported, an increase from 835 in the previous week. Additionally, cases of VOCs accounted for close to 70% of new cases reported this week.

As of May 1, a total of 485,374 doses of COVID19 vaccines have been administered and 38.3% of residents aged 18 years and older in Manitoba have been immunized with at least one dose.

Cases

About cases

  • New cases: 1,688
  • Total cases: 39,303
  • Total VOC cases: 3,007
  • Recovered cases: 36,885
More Analyses

Testing

About testing

This week

  • Average daily specimens: 3,426
  • Weekly positivity rate: 7.6%

Total

  • Tested people: 432,054
  • Population tested: 31.7%
  • Specimens tested: 668,187
  • Positivity rate: 6.3%
More Analyses

Severity

About severity

Severe outcomes associated with COVID-19:

  • Hospitalizations: 2,692
    • ICU admissions: 590
  • Deaths: 985
More Analyses

Outbreaks

About outbreaks

COVID-19 outbreaks: 222

  • Outbreaks in long-term care facilities: 114
  • Outbreaks in schools: 6
More Analyses

Exposure

About exposure

Source of infection in cases (% of total)

  • Travel: 1.5%
  • Close contact to cases: 53.6%
  • Unknown: 23.3%
  • Pending: 21.6%

Close contacts

  • Top contact type: Household exposure
More Analyses

Risk Factors

About risk factors

  • Pregnant cases: 434
  • Health care workers**: 2,102
  • Deceased Health care workers: 2
  • Recovered health care workers: 2,085
More Analyses

Symptoms

About symptoms

Symptomatic cases: 71.8%

Top symptoms (% of reports)

  • Cough: 44.6%
  • Headache: 37.8%
  • Fever: 30.6%
  • Muscle pain (myalgia): 28.3%
  • Sore Throat: 26.7%
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 17.

As of May 1, 31.8% 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: 2
  • 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: 621

Reporting fever and cough: 0.5%

Check Trend

Physician Visits

About sentinal physicians

Influenza Like Illness (ILI) Visits to sentinel physicians: 0.0%

Check Trend

Antiviral

About Antiviral

Units of antiviral dispensed from pharmacies: 0

ED Visits

About emergency room visits

Average daily respiratory visits to emergency department (ED): 105

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, June 2020 – Present

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) by Type and Percentage of VOC Cases in All Cases by Week of Public Health Report Date, Manitoba, June 2020 – Present

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Figure 3. Sex and Age Distribution of COVID-19 Cases, March 2020 – Present

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

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

Health Region Cases Percentage
Winnipeg RHA 21778 55.4%
Southern Health-Santé Sud 5287 13.5%
Interlake-Eastern RHA 2713 6.9%
Prairie Mountain Health 2713 6.9%
Northern Health Region 6812 17.3%

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Testing

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

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

Province Confirmed Cases Tests Completed Test Rate in Population (Estimated %) Positivity Rate (Estimated %)
Alberta 190,734 4,127,070 94.9% 4.6%
British Columbia 129,482 2,480,179 49.1% 5.2%
Manitoba 38,722 676,532 49.6% 5.7%
New Brunswick 1,915 298,490 38.6% 0.6%
Newfoundland and Labrador 1,076 242,140 46.3% 0.4%
Northwest Territories 51 18,351 40.9% 0.3%
Nova Scotia 2,427 551,664 57.1% 0.4%
Nunavut 501 11,881 30.7% 4.2%
Ontario 463,364 13,901,630 96.0% 3.3%
Prince Edward Island 181 142,802 91.7% 0.1%
Quebec 349,773 8,254,648 97.7% 4.2%
Saskatchewan 41,098 764,890 65.3% 5.4%
Yukon 81 8,939 22.0% 0.9%
Canada 1,219,418 31,479,292 84.2% 3.9%

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, June 2020 – Present

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

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

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

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, March 2020 – Present

Source of Infection Cases Percentage
Close contact of known case 1249 59.4%
Pending 186 8.8%
Travel 21 1%
Unknown 646 30.7%
All Cases 2102

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

Role Cases Percentage
Allied Health, Health Professionals, and Support Staff 1237 58.8%
Nurse/Licensed Practical Nurse 584 27.8%
Not identified 158 7.5%
Physician/Physician in training 78 3.7%
First Responder 45 2.1%
All Cases 2102

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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 in All Cases, Manitoba, March 2020 – Present

Regional Health Authority Cases Median Contacts Minimum Contacts Maximum Contacts
Winnipeg Health 21778 3 0 249
Northern Health 6812 0 0 66
Southern Health - Sante Sud 5287 2 0 66
Interlake-Eastern Health 2713 1 0 58
Prairie Mountain Health 2713 3 0 134

Table 6. COVID-19 Contact Summary in New Cases Reported in Week 17, Manitoba, 2021

Regional Health Authority Cases Median Contacts Minimum Contacts Maximum Contacts
Winnipeg Health 1179 4.0 0 111
Prairie Mountain Health 232 2.5 0 48
Southern Health - Sante Sud 116 2.0 0 37
Interlake-Eastern Health 82 3.0 0 42
Northern Health 79 0.0 0 49

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Symptoms

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

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, 2020 – 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

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