Recent health reports in France suggest a rise in respiratory infections, coinciding with the start of the school year. This increase has raised concerns among public health officials, who are monitoring the situation closely. However, it is currently too early to determine whether this signals a true resurgence of the Covid-19 virus. One reason for this uncertainty is that patients are no longer routinely tested or reported for the virus, making it harder to track its spread accurately. To better understand the situation, health authorities are relying on alternative methods of surveillance, such as wastewater analysis. This technique involves testing sewage samples for traces of the virus, which can indicate the presence of the virus in a population even if individuals are not being tested. This method has proven to be a useful tool in detecting changes in viral circulation. Wastewater monitoring has shown that the virus has resumed its circulation since the end of summer. These findings suggest that the virus is still present and active in the community, even if the extent of its spread is not fully known. Public health experts are using this data to inform their response and to prepare for potential increases in cases. While the return to school has been linked to the rise in respiratory infections, it remains unclear how much of this is due to Covid-19 or other common viruses like the flu or the common cold. Authorities are urging people to remain vigilant, continue practicing good hygiene, and stay up to date with vaccinations. They are also emphasizing the importance of continued surveillance and data collection to better understand the evolving situation.