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 51 (December 19 – December 25)

About epidemiological week

Data extracted up to 1:00 am on December 31, 2021
Next reporting date: January 10, 2022

COVID-19: High Activity

In Week 51, there were 3,648 laboratory-confirmed COVID-19 cases reported in Manitoba, an increase from 1,553 in the previous week. The volume of lab tests increased to on average 3,619 people tested for COVID-19 per day compared to 3,196 in the previous week, and the positivity rate of lab tests was 15.2%, an increase from 7.3% in the previous week.

In the 3,648 cases reported this week, 67% were reported from the Winnipeg Regional Health Authority and 11% were reported from the Southern Health - Santé Sud Regional Health Authority. The remaining cases were reported from Prairie Mountain Health Authority (10%), Interlake-Eastern Regional Health Authority (8%), and Northern Health Region (4%).

In all Manitoba residents, 80.8% of residents have been partially vaccinated and 74.7% have been fully vaccinated.

Cases

About cases

  • New cases: 3,648
  • Total cases: 75,051
  • Recovered cases: 68,791
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Testing

About testing

This week:

  • Average daily specimens: 3,619
  • Weekly positivity rate: 15.2%

Total:

  • Tested people: 659,007
  • Population tested: 48.3%
  • Specimens tested: 1,256,816
  • Positivity rate: 6.4%
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Severity

About severity

Severe outcomes associated with COVID-19:

  • Hospitalizations: 5,128
    • ICU admissions3: 1,106
  • Deaths: 1,386
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Outbreaks

About outbreaks

2021 COVID-19 outbreaks: 141

  • Outbreaks in long-term care facilities: 49
  • Outbreaks in schools: 30

Total COVID-19 outbreaks: 303

  • Total outbreaks in long-term care facilities: 135
  • Total outbreaks in schools: 32
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Exposure

About exposure

Source of infection in cases (% of total):

  • Travel: 1.7%
  • Close contact to cases: 53.6%
  • Unknown: 27.2%
  • Pending: 17.5%

Top five outbreak/cluster/special investigation settings:4

  • Workplace: 32.6%
  • School: 16.2%
  • Industrial setting: 12.5%
  • Daycare: 7.7%
  • Acute care setting: 7.2%
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Transmission and Acquisition

About transmission and acquisition

Top five transmission settings in all cases:5

  • Household: 64.0%
  • Social gathering: 14.6%
  • Workplace: 11.4%
  • Transportation: 4.3%
  • School: 4.0%

Top five acquisition settings in cases with unknown source of infection:6

  • Household: 45.9%
  • Workplace: 22.7%
  • Social gathering: 13.5%
  • Retail: 8.1%
  • Food services establishments: 5.9%
More Analyses

Symptoms

About symptoms

Symptomatic cases: 74.4%

Top symptoms (% of reports):

  • Cough: 48.5%
  • Headache: 38.6%
  • Fever: 32.3%
  • Sore Throat: 29.2%
  • Muscle pain (myalgia): 28.0%
More Analyses

Risk Factors

About risk factors

  • Pregnant cases: 926
  • Health care workers7: 3,586
  • Deceased health care workers: 5
  • Recovered health care workers: 3,094
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 25, 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 25, 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 25, 2021

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Figure 4. Cases of COVID-19 by Health Region and Public Health Report Date, Manitoba, January 1, 2021 – December 25, 2021

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Table 1. Cases of COVID-19 by Health Region, Manitoba, March 13, 2020 – December 25, 2021

Health Region Total Cases Cases this week Incidence Rate Age-standardized Incidence Rate *
Winnipeg RHA 40406 2450 31.0 30.6
Southern Health-Santé Sud 13052 414 19.5 19.6
Interlake-Eastern RHA 5533 273 20.4 21.8
Prairie Mountain Health 6050 378 21.9 22.8
Northern Health Region 10010 133 17.2 15.8

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 19, 2021 – December 25, 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 25, 2021


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

Partially vaccinated % Incidence Rate Fully vaccinated % Incidence Rate
AZ/COVISHIELD 419 16.1% 510.2 59 0.7% 748.1
Janssen N/A N/A N/A 21 0.2% 1567.1
Moderna 603 23.2% 287.0 2,084 24.5% 1079.6
Pfizer 1,579 60.7% 204.2 4,626 54.5% 742.4
Mixed vaccine products N/A N/A N/A 1,699 20.0% 1594.2
Total 2,601 100% 231.9 8,491 100% 819.2

2b. Cases After Infection by Age Group

Partially vaccinated % Fully vaccinated %
12-19 178 6.8% 732 8.6%
20-29 332 12.8% 1,759 20.7%
30-39 343 13.2% 1,728 20.4%
40-49 379 14.6% 1,503 17.7%
50-59 481 18.5% 1,146 13.5%
60-69 461 17.7% 819 9.6%
70-79 258 9.9% 423 5.0%
80+ 169 6.5% 381 4.5%
Total 2,601 100% 8,491 100%

2c. Severe Cases After Infection

Partially vaccinated % Fully vaccinated %
Hospitalizations (including ICU admissions)
12-19 1 0.4% 10 2.6%
20-29 14 5.7% 18 4.6%
30-39 15 6.1% 21 5.4%
40-49 14 5.7% 26 6.7%
50-59 39 15.9% 43 11.0%
60-69 51 20.8% 70 17.9%
70+ 111 45.3% 202 51.8%
Total hospitalizations 245 100% 390 100%
Deaths
12-19 0 0.0% 0 0.0%
20-29 0 0.0% 0 0.0%
30-39 1 2.0% 1 1.4%
40-49 0 0.0% 3 4.1%
50-59 10 19.6% 5 6.8%
60-69 11 21.6% 15 20.5%
70+ 29 56.9% 49 67.1%
Total deaths 51 100% 73 100%

2d. Cases After Vaccination by Sex

Partially vaccinated % Fully vaccinated %
Infections in females 1,376 52.9% 4,621 54.4%
Infections in males 1,225 47.1% 3,869 45.6%
Total 2,601 100% 8,490 100%

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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 25, 2021

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Table 3. Cumulative National Testing Volume and Positivity (%) for COVID-19 by Province/Territory, Canada, March 13, 2020 – December 25, 2021

Province Confirmed Cases Tests Completed Test Rate in Population (Estimated %) Positivity Rate (Estimated %)
Alberta 348,715 6,306,188 144.9% 5.5%
British Columbia 235,658 4,935,470 97.8% 4.8%
Manitoba 73,573 1,292,696 94.7% 5.7%
New Brunswick 11,587 611,802 79.1% 1.9%
Newfoundland and Labrador 2,512 424,645 81.2% 0.6%
Northwest Territories 2,090 37,175 82.8% 5.6%
Nova Scotia 13,741 1,532,481 158.5% 0.9%
Nunavut 681 23,373 60.4% 2.9%
Ontario 676,924 20,613,277 142.3% 3.3%
Prince Edward Island 621 249,938 160.6% 0.2%
Quebec 511,095 14,312,365 169.4% 3.6%
Saskatchewan 82,845 1,316,050 112.4% 6.3%
Yukon 1,668 9,129 22.5% 18.3%
Canada 1,961,723 51,664,665 138.1% 3.8%

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 25, 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 25, 2021

Figure 9. Percentage of COVID-19 Cases With Underlying Illnesses, Manitoba, March 13, 2020 – December 25, 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 25, 2021

Source of Infection Cases Percentage
Close contact of known case 1969 54.9%
Pending 234 6.5%
Travel 59 1.6%
Unknown 1324 36.9%
All Cases 3586

Table 5. Roles of Health Care Workers with Non-missing Information, Manitoba, March 13, 2020 – December 25, 2021

Role Cases Percentage
Allied Health, Health Professionals, and Support Staff 2300 64.1%
Nurse/Licensed Practical Nurse 892 24.9%
Not Identified 239 6.7%
Physician/Physician in training 155 4.3%
All Cases 3586

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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 25, 2021

Regional Health Authority Cases Median Contacts Minimum Contacts Maximum Contacts
Winnipeg Health 40406 3 0 249
Southern Health - Sante Sud 13052 2 0 69
Northern Health 10010 1 0 121
Prairie Mountain Health 6050 3 0 134
Interlake-Eastern Health 5533 2 0 76

Table 7. COVID-19 Contact Summary in New Cases Reported in Week 51, Manitoba, 2021

Regional Health Authority Cases Median Contacts Minimum Contacts Maximum Contacts
Winnipeg Health 2450 0 0 19
Southern Health - Sante Sud 414 0 0 10
Prairie Mountain Health 378 0 0 14
Interlake-Eastern Health 273 0 0 5
Northern Health 133 0 0 15

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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 25, 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), PH order #16: (effective December 21, 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 25, 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), PH order #16: (effective December 21, 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 25, 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), PH order #16: (effective December 21, 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 25, 2021

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

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