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 49 (December 5 – December 11)

About epidemiological week

Data extracted up to 1:00 am on December 17, 2021
Next reporting date: December 27, 2021

COVID-19: Increased Activity

In Week 49, there were 1,131 laboratory-confirmed COVID-19 cases reported in Manitoba, an increase from 1,036 in the previous week. The volume of lab tests increased to on average 2,894 people tested for COVID-19 per day compared to 2,712 in the previous week, and the positivity rate of lab tests was 5.8%, the same as the previous week.

In the 1,131 cases reported this week, 33% were reported from the Southern Health - Santé Sud Regional Health Authority and 33% were reported from the Winnipeg Regional Health Authority. The remaining cases were reported from Northern Health Region (13%), Prairie Mountain Health Authority (12%), and Interlake-Eastern Regional Health Authority (9%).

In all Manitoba residents, 78.7% of residents have been partially vaccinated and 74.3% have been fully vaccinated.

Cases

About cases

  • New cases: 1,131
  • Total cases: 69,852
  • Recovered cases: 67,416
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Testing

About testing

This week

  • Average daily specimens: 2,894
  • Weekly positivity rate: 5.8%

Total

  • Tested people: 643,633
  • Population tested: 47.2%
  • Specimens tested: 1,209,108
  • Positivity rate: 6.2%
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Severity

About severity

Severe outcomes associated with COVID-19:

  • Hospitalizations: 4,954
    • ICU admissions3: 1,077
  • Deaths: 1,358
More Analyses

Outbreaks

About outbreaks

2021 COVID-19 outbreaks: 129

  • Outbreaks in long-term care facilities: 43
  • Outbreaks in schools: 25

Total COVID-19 outbreaks: 291

  • Total outbreaks in long-term care facilities: 129
  • Total outbreaks in schools: 27
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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: 17.7%

Top five outbreak/cluster/special investigation settings4

  • Workplace: 31.8%
  • School: 16.5%
  • Industrial setting: 12.9%
  • Daycare: 7.9%
  • Acute care setting: 7.3%
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Transmission and Acquisition

About transmission and acquisition

Top five transmission settings in all cases5

  • Household: 64.0%
  • Social gathering: 14.3%
  • Workplace: 10.1%
  • Transportation: 4.5%
  • School: 3.3%

Top five acquisition settings in cases with unknown source of infection6

  • Household: 46.4%
  • Workplace: 23.1%
  • Social gathering: 14.0%
  • Retail: 8.8%
  • Food services establishments: 5.4%
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Symptoms

About symptoms

Symptomatic cases: 74%

Top symptoms (% of reports)

  • Cough: 47.6%
  • Headache: 38.3%
  • Fever: 32.2%
  • Muscle pain (myalgia): 27.9%
  • Sore Throat: 27.7%
More Analyses

Risk Factors

About risk factors

  • Pregnant cases: 899
  • Health care workers7: 3,099
  • Deceased health care workers: 4
  • Recovered health care workers: 3,074
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 11, 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 11, 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 11, 2021

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Figure 4. Cases of COVID-19 by Health Region and Public Health Report Date, Manitoba, January 1, 2021 – December 11, 2021

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Table 1. Cases of COVID-19 by Health Region, Manitoba, March 13, 2020 – December 11, 2021

Health Region Total Cases Cases this week Incidence Rate Age-standardized Incidence Rate *
Winnipeg RHA 37184 376 4.8 4.7
Southern Health-Santé Sud 12275 372 17.6 17.3
Interlake-Eastern RHA 5175 97 7.2 7.5
Prairie Mountain Health 5519 137 7.9 8.0
Northern Health Region 9699 149 19.3 16.6

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, December 5, 2021 – December 11, 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 11, 2021


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

Partially vaccinated % Incidence Rate Fully vaccinated % Incidence Rate
AZ/COVISHIELD 420 16.4% 512.0 46 1.0% 589.7
Janssen N/A N/A N/A 14 0.3% 1285.6
Moderna 596 23.3% 284.7 1,440 31.2% 750.5
Pfizer 1,542 60.3% 200.3 2,348 50.8% 379.4
Mixed vaccine products N/A N/A N/A 771 16.7% 739.0
Total 2,558 100% 234.3 4,621 100% 448.6

2b. Cases After Infection by Age Group

Partially vaccinated % Fully vaccinated %
12-19 170 6.6% 340 7.4%
20-29 315 12.3% 658 14.2%
30-39 336 13.1% 918 19.9%
40-49 374 14.6% 843 18.2%
50-59 474 18.5% 649 14.0%
60-69 462 18.1% 560 12.1%
70-79 258 10.1% 331 7.2%
80+ 169 6.6% 322 7.0%
Total 2,558 100% 4,621 100%

2c. Severe Cases After Infection

Partially vaccinated % Fully vaccinated %
Hospitalizations (including ICU admissions)
12-19 1 0.4% 3 1.0%
20-29 14 5.8% 10 3.4%
30-39 14 5.8% 17 5.8%
40-49 14 5.8% 18 6.1%
50-59 36 14.9% 27 9.2%
60-69 51 21.2% 56 19.0%
70+ 111 46.1% 163 55.4%
Total hospitalizations 241 100% 294 100%
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 3.0%
50-59 10 19.6% 4 6.0%
60-69 11 21.6% 14 20.9%
70+ 29 56.9% 47 70.1%
Total deaths 51 100% 67 100%

2d. Cases After Vaccination by Sex

Partially vaccinated % Fully vaccinated %
Infections in females 1,358 53.1% 2,501 54.1%
Infections in males 1,200 46.9% 2,120 45.9%
Total 2,558 100% 4,621 100%

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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 11, 2021

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Table 3. Cumulative National Testing Volume and Positivity (%) for COVID-19 by Province/Territory, Canada, March 13, 2020 – December 11, 2021

Province Confirmed Cases Tests Completed Test Rate in Population (Estimated %) Positivity Rate (Estimated %)
Alberta 338,428 6,184,453 142.1% 5.5%
British Columbia 222,013 4,728,569 93.7% 4.7%
Manitoba 69,507 1,248,790 91.5% 5.6%
New Brunswick 9,366 584,877 75.6% 1.6%
Newfoundland and Labrador 2,078 406,819 77.8% 0.5%
Northwest Territories 2,070 36,556 81.4% 5.7%
Nova Scotia 8,591 1,433,225 148.3% 0.6%
Nunavut 676 22,962 59.4% 2.9%
Ontario 629,064 19,960,766 137.8% 3.2%
Prince Edward Island 413 238,433 153.2% 0.2%
Quebec 462,246 13,681,194 162.0% 3.4%
Saskatchewan 81,646 1,293,165 110.4% 6.3%
Yukon 1,580 9,129 22.5% 17.3%
Canada 1,827,691 49,829,014 133.2% 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 11, 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 11, 2021

Figure 9. Percentage of COVID-19 Cases With Underlying Illnesses, Manitoba, March 13, 2020 – December 11, 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 11, 2021

Source of Infection Cases Percentage
Close contact of known case 1759 56.8%
Pending 219 7.1%
Travel 47 1.5%
Unknown 1074 34.7%
All Cases 3099

Table 5. Roles of Health Care Workers with Non-missing Information, Manitoba, March 13, 2020 – December 11, 2021

Role Cases Percentage
Allied Health, Health Professionals, and Support Staff 1916 61.8%
Nurse/Licensed Practical Nurse 785 25.3%
Not Identified 237 7.6%
Physician/Physician in training 103 3.3%
First Responder 58 1.9%
All Cases 3099

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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 11, 2021

Regional Health Authority Cases Median Contacts Minimum Contacts Maximum Contacts
Winnipeg Health 37184 3 0 249
Southern Health - Sante Sud 12275 2 0 69
Northern Health 9699 1 0 121
Prairie Mountain Health 5519 3 0 134
Interlake-Eastern Health 5175 2 0 76

Table 7. COVID-19 Contact Summary in New Cases Reported in Week 49, Manitoba, 2021

Regional Health Authority Cases Median Contacts Minimum Contacts Maximum Contacts
Winnipeg Health 376 4 0 44
Southern Health - Sante Sud 372 3 0 47
Northern Health 149 2 0 36
Prairie Mountain Health 137 5 0 55
Interlake-Eastern Health 97 4 0 29

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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 11, 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 11, 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 11, 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 11, 2021

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

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