Mise à jour concernant le site Web 613COVID
La surveillance des eaux usées d’Ottawa se poursuit grâce à des analyses quotidiennes réalisées dans le laboratoire du Dr Robert Delatolla, professeur au Département de génie civil de l’Université d’Ottawa, qui dirige ce programme depuis son lancement en avril 2020.
Le laboratoire a élargi ses activités au-delà du SARS-CoV-2 afin d’inclure également les virus de la grippe et le RSV, avec des données publiées régulièrement sur le site officiel.
Veuillez suivre @DelatollaLab sur X (Twitter) pour obtenir une interprétation plus approfondie des données.
La surveillance des eaux usées demeure un indicateur clé pour suivre le COVID-19 et d’autres maladies, et des efforts sont en cours afin de développer un tableau de bord national de surveillance des eaux usées.
Nous remercions le Dr Doug Manuel et le Dr Tyson Graber pour leurs précieuses contributions et leur soutien tout au long de la pandémie et au-delà.
Ces collaborations reflètent un engagement commun envers l’avancement des initiatives de santé publique grâce à des recherches et des analyses de données innovantes.
https://donnez.uottawa.ca/page/189424/donate/1?locale=fr-CA&appealCode=27SG-SO-10
Dernière mise à jour des graphiques sur les eaux usées : 8 juin 2026 à 17:23:30
Echantillons d’eaux usées collectés jusqu’à : 31 mai 2026
Données rapportées jusqu’au : 8 juin 2026
Le site Web est mis à jour du lundi au vendredi vers 17 h. Les mises à jour peuvent toutefois être retardées si les mesures ne satisfont pas aux critères d’assurance qualité et de contrôle qualité.
Les échantillons collectés du lundi au jeudi sont analysés le lendemain de leur collecte. Le site Web et les graphiques sont ensuite mis à jour le jour suivant l’analyse. Les échantillons collectés du vendredi au dimanche sont analysés le lundi et publiés sur le site Web le mardi à 17 h.
Les personnes atteintes de la COVID-19 excrètent le virus SARS-CoV-2 dans leurs selles, qu’elles présentent ou non des symptômes, qu’elles aient passé un test de dépistage ou qu’elles aient reçu un diagnostic officiel. Ainsi, contrairement à l’évaluation des niveaux de COVID-19 dans la communauté à partir du nombre de cas actifs - une méthode qui peut sous-estimer les infections asymptomatiques et être influencée par l’accès limité aux tests - la surveillance des eaux usées permet de suivre de façon plus représentative la présence du virus dans la population, puisque tout le monde utilise les toilettes. En plus d’être une source précieuse de confirmation des niveaux de COVID-19 dans la communauté, la surveillance des eaux usées peut également servir d’indicateur précoce d’éventuelles éclosions, comme décrit ci-dessous.
For mobile users, dragging the plot while in landscape mode will allow you to view current data. Using the display options at the top allows you to modify the view by zooming in and out of the plot.
Data last reported 2026-06-03. Click here for more details on wastewater data reporting.
Current growth estimates for the amount of virus in wastewater
| measure | estimate |
|---|---|
| Expected change in viral amount | Unsure |
| Rate of growth | 0.14 (0.01 – 0.33) |
| Doubling/halving time (days) | 5.1 (2.1 – 67) |
Influenza virus
Samples are screened for influenza A virus (IAV) once a week during the summer period (April to September). Samples are screened daily for IAV and influenza B virus (IBV) during the winter period (October to March). The website and plots are updated the day after processing.
The next plot illustrate the 7-day rolling mean in daily IAV wastewater viral signal. This number is the average of a week’s daily readings.
Respiratory Syncytial Virus Infection (RSV)
Samples are screened daily for respiratory syncytial virus (RSV) during the winter period (October to March). This test does not differentiate between RSV A and RSV B strains. The website and plots are updated the day after processing.
The next plots illustrate the 7-day rolling mean in daily RSV wastewater viral signal. This number is the average of a week’s daily readings. RSV is not a reportable disease, meaning that it does not fall under the list of diseases of public health significance in Ontario as designated by the Minister of Health\(^1\). Nevertheless, RSV has been identified as a disease that could benefit from wastewater-based surveillance given its contribution to seasonal emergency department visits and hospitalizations among young children and to outbreaks in healthcare institutions such as long-term care homes. Visit Respiratory Virus Detections in Canada for more information on RSV surveillance.
Interpretation cautions
The accuracy and reliability of SARS-CoV-2, influenza and RSV wastewater testing is improving as scientists understand the role of factors such as differences in sewage systems and laboratory protocols. Nonetheless, we recommend caution when interpreting daily or less then 3-day variation in the viral signal while evaluation of the methodology in public health surveillance is ongoing. Research is underway to arrive at a more precise estimate of sensitivity. For influenza and RSV, the level of detection is currently unknown as less than a year’s worth of data has been collected, but evaluation is ongoing. Thus, direct comparisons between wastewater signal levels for the 3 viruses is not recommended at this time. COVID-19, influenza and RSV wastewater signal is helpful when interpreted alongside other surveillance measures, taking into consideration the strengths and limitations of each measure. It is most promising as an early indicator\(^2\) of community viral activity and illness and may serve as a warning in advance of increased care-seeking, outbreaks and hospitalizations.
Visit the Ottawa Public Health Respiratory and Enteric Surveillance Report for more information on Ottawa’s public health surveillance of respiratory and enteric viruses.
For more information on wastewater testing in Ottawa, please see the contact page.
Citations:
Health Protection and Promotion Act, R.S.O. 1990, c. H.7. https://www.ontario.ca/laws/statute/90h07?search=diseases+of+public+health+significance.
Mercier, É. et al. Wastewater surveillance of influenza activity: Early detection, surveillance, and subtyping in city and neighbourhood communities (preprint). (2022) doi:10.1101/2022.06.28.22276884.
See the Methods page for more information on how the samples were collected, access to the data, and how the plots were created. The plots are currently for research only and presented to the public for discussion.
You can learn more about wastewater epidemiology and its role in COVID-19 surveillance on Ottawa Public Health’s website.
Definitions
* A 7-day average is generated by averaging the levels from a given day with the six previous days. The average is termed “rolling” as it changes each day.
* For new cases, the reported date is the day the test result is reported by the laboratory. Episode date is the approximate date of COVID-19 infection estimated from information available: the date of symptom onset, test date, or the reported date.
* Percent positivity refers to the percentage of individuals tested for either COVID-19 infection or influenza A infection in a given day that test positive.
* A central question in wastewater epidemiology is determining the proportion of the wastewater that is actually from humans and the proportion that is rain water, snow melt etc. To address this issue, viral copy data is thus normalized using a seasonally stable fecal biomarker; pepper mild mottle virus (PMMoV). See methods for more details.
^ Percent change in 7-day average is calculated by comparing the 7-day average (previous day 1 to 7) with a lagged 7-day average (days 8 to 14).
