Provincial Respiratory Surveillance Report

COVID-19


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. In this weekly report, we provide regular updates about the current activity of COVID-19 in Manitoba to present a detailed overview about COVID-19 cases and contacts.

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.

For reporting on seasonal influenza in 2021-2022 season, please visit www.gov.mb.ca/health/publichealth/surveillance/influenza/index.html

Week 48 (November 28 – December 4)

About epidemiological week

Data extracted up to 1:00 am on December 10, 2021
Next reporting date: December 20, 2021

COVID-19: Increased Activity

In Week 48, there were 1,036 laboratory-confirmed COVID-19 cases reported in Manitoba, an increase from 985 in the previous week. The volume of lab tests decreased to on average 2,712 people tested for COVID-19 per day compared to 2,771 in the previous week, and the positivity rate of lab tests was 5.8%, an increase from 5.3% in the previous week.

In the 1,036 cases reported this week, 39% were reported from the Southern Health - Santé Sud Regional Health Authority and 28% were reported from the Winnipeg Regional Health Authority. The remaining cases were reported from Northern Health Region (13%), Prairie Mountain Health Authority (10%), and Interlake-Eastern Regional Health Authority (10%).

In all Manitoba residents, 77.1% of residents have been partially vaccinated and 74.0% have been fully vaccinated.

Cases

About cases

  • New cases: 1,036
  • Total cases: 68,721
  • Recovered cases: 66,312
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Testing

About testing

This week

  • Average daily specimens: 2,712
  • Weekly positivity rate: 5.8%

Total

  • Tested people: 637,169
  • Population tested: 46.7%
  • Specimens tested: 1,188,853
  • Positivity rate: 6.2%
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Severity

About severity

Severe outcomes associated with COVID-19:

  • Hospitalizations: 4,891
    • ICU admissions3: 1,065
  • Deaths: 1,343
More Analyses

Outbreaks

About outbreaks

2021 COVID-19 outbreaks: 127

  • Outbreaks in long-term care facilities: 43
  • Outbreaks in schools: 24

Total COVID-19 outbreaks: 289

  • Total outbreaks in long-term care facilities: 129
  • Total outbreaks in schools: 26
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Exposure

About exposure

Source of infection in cases (% of total)

  • Travel: 1.6%
  • Close contact to cases: 54.5%
  • Unknown: 26.2%
  • Pending: 17.8%

Top five outbreak/cluster/special investigation settings4

  • Workplace: 31.6%
  • School: 16.3%
  • Industrial setting: 13.1%
  • Daycare: 8.0%
  • Acute care setting: 7.2%
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Transmission and Acquisition

About transmission and acquisition

Top five transmission settings in all cases5

  • Household: 64.1%
  • Social gathering: 14.3%
  • Workplace: 10.0%
  • Transportation: 4.5%
  • School: 3.1%

Top five acquisition settings in cases with unknown source of infection6

  • Household: 46.5%
  • Workplace: 23.3%
  • Social gathering: 14.2%
  • Retail: 8.7%
  • Food services establishments: 5.4%
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Symptoms

About symptoms

Symptomatic cases: 73.9%

Top symptoms (% of reports)

  • Cough: 47.5%
  • Headache: 38.2%
  • Fever: 32.3%
  • Muscle pain (myalgia): 28.0%
  • Sore Throat: 27.7%
More Analyses

Risk Factors

About risk factors

  • Pregnant cases: 886
  • Health care workers7: 3,061
  • Deceased health care workers: 4
  • Recovered health care workers: 3,037
More Analyses

Important Notes

  1. Data about COVID-19 cases and contacts 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. The top five settings where cases are found to be linked with an outbreak or cluster or special investigation.
  5. Transmission settings include those settings exposed during a case’s communicability period, i.e., 48 hours prior to the development of overt symptoms in the case until the case is classified as no longer infectious. Percentages are calculated using total cases counts as a denominator. Categories are NOT mutually exclusive.
  6. Acquisition settings include those settings exposed during a case’s incubation period, i.e., 14 days before symptom onset date. Percentages are calculated using community-transmitted case counts as a denominator for acquisition settings. Categories are NOT mutually exclusive.
  7. 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, August 23, 2020 – December 4, 2021

Note. Deaths due to COVID-19 were aligned by week of death date.
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Figure 2. Sex and Age Distribution of COVID-19 Cases, March 1, 2020 – December 4, 2021

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Figure 3. Incidence Rate (/10,000 Population) of COVID-19 Cases by Age Group and Week of Public Health Report Date, Manitoba, August 23, 2020 – December 4, 2021

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Figure 4. Cases of COVID-19 by Health Region and Public Health Report Date, Manitoba, January 1, 2021 – December 4, 2021

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Table 1. Cases of COVID-19 by Health Region, Manitoba, March 13, 2020 – December 4, 2021

Health Region Total Cases Cases this week Incidence Rate Age-standardized Incidence Rate *
Winnipeg RHA 36803 295 3.7 3.7
Southern Health-Santé Sud 11905 403 19.0 18.8
Interlake-Eastern RHA 5084 103 7.7 7.9
Prairie Mountain Health 5381 106 6.1 6.2
Northern Health Region 9548 129 16.7 14.9

Note: * Age-standardized rates are used to account for differences in the age structure in health regions. The whole Manitoba population is used as the standard population.

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Figure 5. Vaccination Status in New Cases, Non-ICU Hospital Admissions, ICU Admissions, and Deaths, Manitoba, November 28, 2021 – December 4, 2021


Note: Unprotected Case: Individuals vaccinated 0–13 days following the first dose of a COVID-19 vaccine. Partially Vaccinated Case: Individuals vaccinated >=14 days following the first dose of a 2-dose series COVID-19 vaccine if only one dose was received and 0-13 days following the second dose if two doses were received. Fully Vaccinated Case: Individuals vaccinated >=14 days following the second dose of a 2-dose series or first dose of a 1-dose series of a COVID-19 vaccine.

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Table 2. COVID-19 Cases After Vaccination, Manitoba, December 16, 2020 – December 4, 2021


2a. Cases and Incidence Rate (/100,000 Vaccinated Individuals) After Vaccination, Overall

Partially vaccinated % Incidence Rate Fully vaccinated % Incidence Rate
AZ/COVISHIELD 420 16.5% 512.3 43 1.0% 554.6
Janssen N/A N/A N/A 14 0.3% 1466.0
Moderna 591 23.2% 283.0 1,317 32.1% 689.3
Pfizer 1,531 60.2% 199.4 2,065 50.4% 335.1
Mixed vaccine products N/A N/A N/A 658 16.1% 633.5
Total 2,542 100% 237.9 4,099 100% 399.4

2b. Cases After Infection by Age Group

Partially vaccinated % Fully vaccinated %
12-19 168 6.6% 290 7.1%
20-29 313 12.3% 572 14.0%
30-39 332 13.1% 800 19.5%
40-49 373 14.7% 757 18.5%
50-59 472 18.6% 576 14.1%
60-69 461 18.1% 500 12.2%
70-79 255 10.0% 295 7.2%
80+ 168 6.6% 309 7.5%
Total 2,542 100% 4,099 100%

2c. Severe Cases After Infection

Partially vaccinated % Fully vaccinated %
Hospitalizations (including ICU admissions)
12-19 1 0.4% 3 1.1%
20-29 14 5.8% 8 2.9%
30-39 14 5.8% 15 5.5%
40-49 14 5.8% 18 6.6%
50-59 36 15.0% 27 9.9%
60-69 51 21.2% 53 19.3%
70+ 110 45.8% 150 54.7%
Total hospitalizations 240 100% 274 100%
Deaths
12-19 0 0.0% 0 0.0%
20-29 0 0.0% 0 0.0%
30-39 1 2.0% 0 0.0%
40-49 0 0.0% 2 3.2%
50-59 10 19.6% 4 6.5%
60-69 11 21.6% 12 19.4%
70+ 29 56.9% 44 71.0%
Total deaths 51 100% 62 100%

2d. Cases After Vaccination by Sex

Partially vaccinated % Fully vaccinated %
Infections in females 1,353 53.2% 2,245 54.8%
Infections in males 1,189 46.8% 1,854 45.2%
Total 2,542 100% 4,099 100%

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Testing

Figure 6. Average Daily Testing Volume and Positivity (%) for COVID-19 by Week of Specimen Receiving Date, Manitoba, August 23, 2020 – December 4, 2021

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Table 3. Cumulative National Testing Volume and Positivity (%) for COVID-19 by Province/Territory, Canada, March 13, 2020 – December 4, 2021

Province Confirmed Cases Tests Completed Test Rate in Population (Estimated %) Positivity Rate (Estimated %)
Alberta 336,392 6,089,373 140.0% 5.5%
British Columbia 219,584 4,643,209 92.0% 4.7%
Manitoba 68,308 1,229,315 90.1% 5.6%
New Brunswick 8,603 574,635 74.3% 1.5%
Newfoundland and Labrador 2,064 403,161 77.1% 0.5%
Northwest Territories 2,068 36,260 80.7% 5.7%
Nova Scotia 8,381 1,409,830 145.8% 0.6%
Nunavut 674 22,774 58.9% 3.0%
Ontario 621,260 19,722,154 136.2% 3.2%
Prince Edward Island 382 233,749 150.2% 0.2%
Quebec 451,868 13,445,134 159.2% 3.4%
Saskatchewan 81,225 1,281,109 109.4% 6.3%
Yukon 1,537 9,129 22.5% 16.8%
Canada 1,802,359 49,099,908 131.3% 3.7%

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

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Severity

Figure 7. Severe Outcomes of COVID-19 by Week of Public Health Report Date, Manitoba, August 23, 2020 – December 4, 2021

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

Figure 8. Age Distribution of Severe COVID-19 Cases Compared to All Cases, Manitoba, March 13, 2020 – December 4, 2021

Figure 9. Percentage of COVID-19 Cases With Underlying Illnesses, Manitoba, March 13, 2020 – December 4, 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 4. Source of Infection in Health Care Workers with Non-missing Information, Manitoba, March 13, 2020 – December 4, 2021

Source of Infection Cases Percentage
Close contact of known case 1736 56.7%
Pending 219 7.2%
Travel 46 1.5%
Unknown 1060 34.6%
All Cases 3061

Table 5. Roles of Health Care Workers with Non-missing Information, Manitoba, March 13, 2020 – December 4, 2021

Role Cases Percentage
Allied Health, Health Professionals, and Support Staff 1891 61.8%
Nurse/Licensed Practical Nurse 774 25.3%
Not Identified 235 7.7%
Physician/Physician in training 103 3.4%
First Responder 58 1.9%
All Cases 3061

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Outbreaks

Figure 10. Weekly COVID-19 Outbreaks, Manitoba, 2018 – 2021

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Contacts

Table 6. COVID-19 Contact Summary in All Cases, Manitoba, March 13, 2020 – December 4, 2021

Regional Health Authority Cases Median Contacts Minimum Contacts Maximum Contacts
Winnipeg Health 36803 3 0 249
Southern Health - Sante Sud 11905 2 0 69
Northern Health 9548 1 0 121
Prairie Mountain Health 5381 3 0 134
Interlake-Eastern Health 5084 2 0 76

Table 7. COVID-19 Contact Summary in New Cases Reported in Week 48, Manitoba, 2021

Regional Health Authority Cases Median Contacts Minimum Contacts Maximum Contacts
Southern Health - Sante Sud 403 3 0 46
Winnipeg Health 295 4 0 55
Northern Health 129 0 0 44
Prairie Mountain Health 106 3 0 27
Interlake-Eastern Health 103 4 0 33

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Figure 11. Percentage of COVID-19 Cases Linked to Top-five Cluster/Outbreak/Special Investigation Settings, Manitoba, January 24, 2021 – December 4, 2021

Note: COVID-19 public health orders in Manitoba since January 23, 2021: PH order #1 (effective January 23, 2021), PH order #2 (effective March 5, 2021), PH order #3 (effective March 26, 2021), PH order #4 (effective April 19, 2021), PH order #5 (effective April 28, 2021), PH order #6 (effective May 9, 2021), PH order #7 (effective May 22, 2021), PH order #8 (effective May 29, 2021), PH order #9 (effective June 12, 2021), PH order #10 (effective June 26, 2021), PH order #11: (effective July 17, 2021), PH order #12: (effective August 7, 2021), PH order #13: (effective August 28, 2021), PH order #14: (effective October 5, 2021), PH order #15: (effective November 13, 2021). Content of Public Health Orders

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Figure 12. Percentage of Total COVID-19 Cases Exposed to Top-five Transmission Settings, Manitoba, January 24, 2021 – December 4, 2021

Note: COVID-19 public health orders in Manitoba since January 23, 2021: PH order #1 (effective January 23, 2021), PH order #2 (effective March 5, 2021), PH order #3 (effective March 26, 2021), PH order #4 (effective April 19, 2021), PH order #5 (effective April 28, 2021), PH order #6 (effective May 9, 2021), PH order #7 (effective May 22, 2021), PH order #8 (effective May 29, 2021), PH order #9 (effective June 12, 2021), PH order #10 (effective June 26, 2021), PH order #11: (effective July 17, 2021), PH order #12: (effective August 7, 2021), PH order #13: (effective August 28, 2021), PH order #14: (effective October 5, 2021), PH order #15: (effective November 13, 2021). Content of Public Health Orders

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Figure 13. Percentage of Community-transmitted COVID-19 Cases Exposed to Top-five Acquisition Settings, Manitoba, January 24, 2021 – December 4, 2021

Note: COVID-19 public health orders in Manitoba since January 23, 2021: PH order #1 (effective January 23, 2021), PH order #2 (effective March 5, 2021), PH order #3 (effective March 26, 2021), PH order #4 (effective April 19, 2021), PH order #5 (effective April 28, 2021), PH order #6 (effective May 9, 2021), PH order #7 (effective May 22, 2021), PH order #8 (effective May 29, 2021), PH order #9 (effective June 12, 2021), PH order #10 (effective June 26, 2021), PH order #11: (effective July 17, 2021), PH order #12: (effective August 7, 2021), PH order #13: (effective August 28, 2021), PH order #14: (effective October 5, 2021), PH order #15: (effective November 13, 2021). Content of Public Health Orders

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Symptoms

Figure 14. Percentage of Symptoms Reported by COVID-19 Cases, Manitoba, March 13, 2020 – December 4, 2021

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

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