Wastewater testing finds flu early in London, helps protect people

Wastewater testing can find flu viruses in London up to two weeks earlier than people getting sick and going to the doctor.
By Newsroom | Public Health, London |

COMMUNITY OUTBREAKS CAN BE FORESEEN VIA WASTEWATER ANALYSIS, OFFERING A CRUCIAL, EARLIER WARNING THAN TRADITIONAL REPORTING.

Data gleaned from wastewater systems reveals the presence and quantity of influenza viruses, specifically Influenza A and B, providing a predictive marker for impending community-wide outbreaks. This method outpaces clinical diagnosis, allowing for a proactive rather than reactive public health stance.

Current methods of tracking influenza rely on the reporting of diagnosed cases. This research, however, shows that detecting influenza virus RNA in wastewater offers a more immediate snapshot of circulating pathogens. This approach has been validated for tracking Influenza A, and while Influenza B is also detectable, it typically appears in lower concentrations. The potential for future pandemics from influenza viruses remains a significant concern, making robust surveillance systems paramount.

PREDICTIVE POWER FOR PERSONAL PROTECTION

Public health officials suggest that monitoring wastewater data empowers individuals to take timely protective measures. This includes adjusting social habits during periods of heightened influenza activity and strategically timing vaccinations. Getting a flu shot in early fall, before widespread circulation, is often recommended.

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TECHNOLOGICAL ADVANCEMENTS IN SURVEILLANCE

The capability to monitor influenza through wastewater stems from advancements in analytical techniques. Methods like digital PCR assays are optimized for the complex wastewater environment, allowing for reliable detection. Furthermore, technologies such as metagenomic shotgun sequencing can identify different influenza subtypes present in the sewage. This enables the determination of the genetic makeup of circulating viral strains.

EXPANDING THE SURVEILLANCE SCOPE

Beyond influenza, wastewater surveillance has proven invaluable for tracking other respiratory viruses like RSV and SARS-CoV-2. The effectiveness of this method in monitoring a range of pathogens from a single sample source underscores its versatility. There is also an ongoing integration of human and animal pathogen signals, a concept known as 'One Health,' particularly relevant given the zoonotic potential of Influenza A viruses.

BACKGROUND

Influenza viruses have historically caused severe pandemics, and the risk of future outbreaks persists. Traditional surveillance relies on the clinical diagnosis and reporting of disease cases, a process that inherently lags behind actual transmission. Wastewater-based epidemiology (WBE) offers an alternative, non-invasive means of monitoring pathogen circulation at a population level. This approach has gained traction following its success in tracking SARS-CoV-2. The studies referenced explore the application and refinement of WBE for influenza, investigating the detectability of viral RNA and the capacity to identify specific subtypes and genetic variants within wastewater samples. The aim is to establish a more comprehensive and timely picture of public health threats.

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Frequently Asked Questions

Q: How does wastewater testing help find flu in London?
Scientists can test sewage water in London to find flu viruses. This is a new way to see if flu is starting to spread in the community.
Q: Why is finding flu early in London important?
Finding flu early helps people in London protect themselves. It means they can get a flu shot or be more careful before many people get sick.
Q: Can wastewater testing find other viruses in London?
Yes, testing wastewater in London can also help track other viruses like RSV and COVID-19, not just flu.
Q: How much earlier can wastewater testing find flu in London?
This new method can find flu viruses in London's wastewater up to two weeks before doctors start seeing many sick people.
Q: What kind of flu viruses can be found in London's wastewater?
Scientists can find Influenza A and Influenza B viruses in the wastewater. Influenza A is found more often.