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:

To understand COVID-19 within the respiratory context;
To present a detailed overview about COVID-19 cases and contacts; and
To continue monitor and report on seasonal influenza during the pandemic.

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 30 (July 25 – July 31)

About epidemiological week

Data extracted up to 4:00 am on August 6, 2021
Next reporting date: August 16, 2021

COVID-19: Decreased Activity

In Week 30, there were 205 laboratory-confirmed COVID-19 cases reported in Manitoba, a decrease from 269 in the previous week. The volume of lab tests decreased to on average 1,440 people tested for COVID-19 per day compared to 1,460 in the previous week, and the positivity rate of lab tests was 2.3%, a decrease from 3.1% in the previous week.

In the 205 cases reported this week, 35% were reported from the Interlake-Eastern Regional Health Authority and 30% were reported from the Winnipeg Regional Health Authority. The remaining cases were reported from Southern Health - Santé Sud Regional Health Authority (17%), Northern Health Region (14%), and Prairie Mountain Health Authority (4%).

This week, 136 cases of variants of concern (VOCs) have been reported, a decrease from 188 in the previous week. Additionally, cases of VOCs accounted for 66% of new cases reported this week.

As of July 31, a total of 1,803,488 doses of COVID19 vaccines have been administered and 79.8% of residents aged 12 years and older in Manitoba have been immunized with at least one dose.

Cases

About cases

New cases: 205
Total cases: 57,652
Total VOC cases: 16,730
Recovered cases: 56,020

More Analyses

Testing

About testing

This week

Average daily specimens: 1,440
Weekly positivity rate: 2.3%

Total

Tested people: 518,394
Population tested: 38%
Specimens tested: 875,870
Positivity rate: 7.1%

More Analyses

Provincial testing
National testing

Severity

About severity

Severe outcomes associated with COVID-19:

Hospitalizations: 3,986

ICU admissions³: 904

Deaths: 1,183

More Analyses

Severe Outcomes
Age
Underlying Illness

Outbreaks

About outbreaks

COVID-19 outbreaks: 241

Outbreaks in long-term care facilities: 120
Outbreaks in schools: 6

More Analyses

Exposure

About exposure

Source of infection in cases (% of total)

Travel: 1.3%
Close contact to cases: 55.8%
Unknown: 24.8%
Pending: 18.2%

Top five outbreak/cluster/special investigation settings⁴

Workplace: 36.3%
Industrial setting: 17.5%
Daycare: 10.2%
Acute care setting: 7.9%
School: 7.9%

More Analyses

Contacts
Cases related to clusters/outbreaks

Transmission and Acquisition

About transmission and acquisition

Top five transmission settings in all cases⁵

Household: 61.4%
Social gathering: 11.6%
Workplace: 9.9%
Transportation: 4.5%
School: 3.2%

Top five acquisition settings in cases with unknown source of infection⁶

Household: 29.5%
Workplace: 16.7%
Retail: 11.0%
Social gathering: 6.5%
School: 3.7%

More Analyses

Potential transmission settings
Potential acquisition settings

Symptoms

About symptoms

Symptomatic cases: 73.1%

Top symptoms (% of reports)

Cough: 46.3%
Headache: 38.2%
Fever: 32.1%
Muscle pain (myalgia): 28.4%
Sore Throat: 27.6%

More Analyses

All symptoms

Risk Factors

About risk factors

Pregnant cases: 705
Health care workers⁷: 2,570
Deceased health care workers: 4
Recovered health care workers: 2,563

More Analyses

Health care workers

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 30.

As of July 31, 31.6% 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: 4
Influenza B: 3

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: 532

Reporting fever and cough: 0.2%

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): 109

Check Trend

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 16, 2020 – July 31, 2021

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, August 16, 2020 – July 31, 2021

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Figure 3. Sex and Age Distribution of COVID-19 Cases, March 1, 2020 – July 31, 2021

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

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Table 1. Cases of COVID-19 by Health Region, Manitoba, March 13, 2020 – July 31, 2021

Health Region	Cases	Percentage
Winnipeg RHA	33831	58.7%
Southern Health-Santé Sud	7649	13.3%
Interlake-Eastern RHA	4166	7.2%
Prairie Mountain Health	4012	7.0%
Northern Health Region	7994	13.9%

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Testing

Figure 5. Average Daily Testing Volume and Positivity (%) for COVID-19 by Week of Specimen Receiving Date, Manitoba, August 16, 2020 – July 31, 2021

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Table 2. Cumulative National Testing Volume and Positivity (%) for COVID-19 by Province/Territory, Canada, March 13, 2020 – July 31, 2021

Province	Confirmed Cases	Tests Completed	Test Rate in Population (Estimated %)	Positivity Rate (Estimated %)
Alberta	234,295	4,845,318	111.4%	4.8%
British Columbia	149,889	3,075,178	60.9%	4.9%
Manitoba	57,593	916,288	67.2%	6.3%
New Brunswick	2,365	392,001	50.7%	0.6%
Newfoundland and Labrador	1,437	313,254	59.9%	0.5%
Northwest Territories	128	25,739	57.3%	0.5%
Nova Scotia	5,887	1,024,860	106.0%	0.6%
Nunavut	657	18,554	48.0%	3.5%
Ontario	550,178	16,397,277	113.2%	3.4%
Prince Edward Island	208	179,191	115.1%	0.1%
Quebec	377,297	10,314,394	122.1%	3.7%
Saskatchewan	49,940	955,609	81.6%	5.2%
Yukon	596	9,129	22.5%	6.5%
Canada	1,430,483	38,466,868	102.8%	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 6. Severe Outcomes of COVID-19 by Week of Public Health Report Date, Manitoba, August 16, 2020 – July 31, 2021

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 13, 2020 – July 31, 2021

Figure 8. Percentage of COVID-19 Cases With Underlying Illnesses, Manitoba, March 13, 2020 – July 31, 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 3. Source of Infection in Health Care Workers with Non-missing Information, Manitoba, March 13, 2020 – July 31, 2021

Source of Infection	Cases	Percentage
Close contact of known case	1511	58.8%
Pending	197	7.7%
Travel	24	0.9%
Unknown	838	32.6%
All Cases	2570

Table 4. Roles of Health Care Workers with Non-missing Information, Manitoba, March 13, 2020 – July 31, 2021

Role	Cases	Percentage
Allied Health, Health Professionals, and Support Staff	1573	61.2%
Nurse/Licensed Practical Nurse	661	25.7%
Not identified	194	7.5%
Physician/Physician in training	86	3.3%
First Responder	56	2.2%
All Cases	2570

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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 13, 2020 – July 31, 2021

Regional Health Authority	Cases	Median Contacts	Maximum Contacts
Winnipeg Health	33831	3	249
Northern Health	7994	1	121
Southern Health - Sante Sud	7649	2	69
Interlake-Eastern Health	4166	1	76
Prairie Mountain Health	4012	3	134

Table 6. COVID-19 Contact Summary in New Cases Reported in Week 30, Manitoba, 2021

Regional Health Authority	Cases	Median Contacts	Maximum Contacts
Interlake-Eastern Health	72	0.0	12
Winnipeg Health	62	3.0	18
Southern Health - Sante Sud	35	2.0	8
Northern Health	28	4.0	17
Prairie Mountain Health	8	2.5	17

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Figure 10. Percentage of COVID-19 Cases Linked to Top-five Cluster/Outbreak/Special Investigation Settings, Manitoba, January 24, 2021 – July 31, 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). Content of Public Health Orders

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Figure 11. Percentage of Total COVID-19 Cases Exposed to Top-five Transmission Settings, Manitoba, January 24, 2021 – July 31, 2021

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Figure 12. Percentage of Community-transmitted COVID-19 Cases Exposed to Top-five Acquisition Settings, Manitoba, January 24, 2021 – July 31, 2021

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Symptoms

Figure 13. Percentage of Symptoms Reported by COVID-19 Cases, Manitoba, March 13, 2020 – July 31, 2021

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

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FluWatchers

Figure 14. Weekly FluWatchers Participants and Percentage Reporting Fever and Cough, Manitoba, 2020 – 2021

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Physician Visits

Figure 15. Weekly Percentage of ILI Related Visits to Sentinel Physicians, Manitoba, 2021

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ED Visits

Figure 16. 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