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 respiratory surveillance report, we provide regular updates about the current activity of COVID-19 in Manitoba with overall objectives:

To understand COVID-19 within the respiratory context;
To present a detailed overview about COVID-19 cases and contacts; and

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.

Reporting for seasonal influenza in 2021-2022 season will start on October 15, 2021 for Week 40 (October 3–9, 2021).

Week 35 (August 29 – September 4)

About epidemiological week

Data extracted up to 4:00 am on September 10, 2021
Next reporting date: September 20, 2021

COVID-19: Decreased Activity

In Week 35, there were 283 laboratory-confirmed COVID-19 cases reported in Manitoba, a decrease from 392 in the previous week. The volume of lab tests increased to on average 1,986 people tested for COVID-19 per day compared to 1,895 in the previous week, and the positivity rate of lab tests was 2.5%, a decrease from 3.1% in the previous week.

In the 283 cases reported this week, 34% were reported from the Winnipeg Regional Health Authority and 33% were reported from the Southern Health - Santé Sud Regional Health Authority. The remaining cases were reported from Interlake-Eastern Regional Health Authority (14%), Northern Health Region (12%), and Prairie Mountain Health Authority (7%).

This week, 214 cases of variants of concern (VOCs) have been reported, a decrease from 314 in the previous week. Additionally, cases of VOCs accounted for 76% of new cases reported this week.

In all Manitoba residents aged 12 years and older, 83.8% of residents have been partially vaccinated and 77.6% have been fully vaccinated. This week, the majority of new cases, severe cases among them and VOC cases were unvaccinated.

Cases

About cases

New cases: 283
Total cases: 58,934
Total VOC cases: 17,684
Recovered cases: 57,438

More Analyses

Epi curve
Epi curve of VOCs
Daily Case Counts (.csv)
Age and sex
Health region
Vaccination status
National update

Testing

About testing

This week

Average daily specimens: 1,986
Weekly positivity rate: 2.5%

Total

Tested people: 542,562
Population tested: 39.8%
Specimens tested: 935,842
Positivity rate: 6.8%

More Analyses

Provincial testing
National testing

Severity

About severity

Severe outcomes associated with COVID-19:

Hospitalizations: 4,084

ICU admissions³: 883

Deaths: 1,199

More Analyses

Severe Outcomes
Age
Underlying Illness

Outbreaks

About outbreaks

COVID-19 outbreaks: 244

Outbreaks in long-term care facilities: 121
Outbreaks in schools: 6

More Analyses

Exposure

About exposure

Source of infection in cases (% of total)

Travel: 1.4%
Close contact to cases: 55.9%
Unknown: 25.0%
Pending: 17.6%

Top five outbreak/cluster/special investigation settings⁴

Workplace: 36.0%
Industrial setting: 17.4%
Daycare: 10.2%
Acute care setting: 7.7%
School: 7.6%

More Analyses

Contacts
Cases related to clusters/outbreaks

Transmission and Acquisition

About transmission and acquisition

Top five transmission settings in all cases⁵

Household: 65.6%
Social gathering: 14.0%
Workplace: 12.6%
Transportation: 5.2%
Retail: 3.7%

Top five acquisition settings in cases with unknown source of infection⁶

Household: 50.2%
Workplace: 32.5%
Retail: 18.6%
Social gathering: 15.0%
Transportation: 6.6%

More Analyses

Potential transmission settings
Potential acquisition settings

Symptoms

About symptoms

Symptomatic cases: 73.6%

Top symptoms (% of reports)

Cough: 46.3%
Headache: 38.1%
Fever: 32.0%
Muscle pain (myalgia): 28.2%
Sore Throat: 27.5%

More Analyses

All symptoms

Risk Factors

About risk factors

Pregnant cases: 732
Health care workers⁷: 2,650
Deceased health care workers: 4
Recovered health care workers: 2,638

More Analyses

Health care workers

Important Notes

Data about COVID-19 cases and contacts aswell as influenza cases are extracted from PHIMS.
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.
ICU admissions were also included in hospitalizations.
The top five settings where cases are found to be linked with an outbreak or cluster or special investigation.
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.
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.
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 – September 4, 2021

Note. Deaths due to COVID-19 were aligned by week of death date.
Back

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, August 23, 2020 – September 4, 2021

Back

Figure 3. Sex and Age Distribution of COVID-19 Cases, March 1, 2020 – September 4, 2021

Back

Figure 4. Cases of COVID-19 by Health Region and Public Health Report Date, Manitoba, September 1, 2020 – September 1, 2021

Back

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

Health Region	Cases	Percentage
Winnipeg RHA	34330	58.3%
Southern Health-Santé Sud	8028	13.6%
Interlake-Eastern RHA	4368	7.4%
Prairie Mountain Health	4090	6.9%
Northern Health Region	8118	13.8%

Back

Figure 5. Vaccination Status in New Cases 12+, non-ICU Hospital Admissions, ICU Admissions, Deaths, and VOCs, Manitoba, August 29, 2021 – September 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.

Back

Testing

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

Back

Table 2. Cumulative National Testing Volume and Positivity (%) for COVID-19 by Province/Territory, Canada, March 13, 2020 – September 4, 2021

Province	Confirmed Cases	Tests Completed	Test Rate in Population (Estimated %)	Positivity Rate (Estimated %)
Alberta	256,985	5,124,166	117.8%	5.0%
British Columbia	168,325	3,464,379	68.6%	4.9%
Manitoba	58,845	979,113	71.8%	6.0%
New Brunswick	2,798	425,210	54.9%	0.7%
Newfoundland and Labrador	1,491	323,270	61.8%	0.5%
Northwest Territories	486	28,774	64.1%	1.7%
Nova Scotia	6,047	1,123,679	116.2%	0.5%
Nunavut	658	19,207	49.7%	3.4%
Ontario	567,878	17,150,277	118.4%	3.3%
Prince Edward Island	233	185,783	119.4%	0.1%
Quebec	391,363	10,919,282	129.3%	3.6%
Saskatchewan	55,396	1,029,254	87.9%	5.4%
Yukon	694	9,129	22.5%	7.6%
Canada	1,511,212	40,781,599	109.0%	3.7%

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

Back

Severity

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

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

Back

Risk Factors

Table 3. Source of Infection in Health Care Workers with Non-missing Information, Manitoba, March 13, 2020 – September 4, 2021

Source of Infection	Cases	Percentage
Close contact of known case	1542	58.2%
Pending	204	7.7%
Travel	30	1.1%
Unknown	874	33%
All Cases	2650

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

Role	Cases	Percentage
Allied Health, Health Professionals, and Support Staff	1621	61.2%
Nurse/Licensed Practical Nurse	673	25.4%
Not identified	209	7.9%
Physician/Physician in training	91	3.4%
First Responder	56	2.1%
All Cases	2650

Back

Outbreaks

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

Back

Contacts

Table 5. COVID-19 Contact Summary in All Cases, Manitoba, March 13, 2020 – September 4, 2021

Regional Health Authority	Cases	Median Contacts	Maximum Contacts
Winnipeg Health	34330	3	249
Northern Health	8118	1	121
Southern Health - Sante Sud	8028	2	69
Interlake-Eastern Health	4368	2	76
Prairie Mountain Health	4090	3	134

Table 6. COVID-19 Contact Summary in New Cases Reported in Week 35, Manitoba, 2021

Regional Health Authority	Cases	Median Contacts	Maximum Contacts
Winnipeg Health	97	3	33
Southern Health - Sante Sud	95	3	23
Interlake-Eastern Health	39	3	21
Northern Health	33	0	10
Prairie Mountain Health	19	3	39

Back

Figure 11. Percentage of COVID-19 Cases Linked to Top-five Cluster/Outbreak/Special Investigation Settings, Manitoba, January 24, 2021 – September 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). Content of Public Health Orders

Back

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

Back

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

Back

Symptoms

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

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

Back