The initiative, known as the Big Catch-Up and led by the World Health Organization, UNICEF and Gavi, the Vaccine Alliance, concluded in March after a three-year effort to restore immunization coverage disrupted by the pandemic.

By the end of December 2025, the campaign had reached an estimated 18.3 million children aged under five across 36 countries in Africa and Asia, delivering more than 100 million vaccine doses, according to a joint statement. Of those, around 12.3 million children had never received any prior vaccination, while 15 million had not previously been immunized against measles.

Health systems worldwide faced severe disruption during the COVID-19 crisis, leading to missed routine immunizations and a resurgence of preventable diseases including measles and polio. The agencies said the campaign also strengthened national immunization systems by improving their ability to identify children who had previously been missed.

Tedros Adhanom Ghebreyesus said the initiative had helped reverse one of the pandemic’s major health setbacks by reaching children who had been excluded due to service disruptions.However, officials warned that significant obstacles persist.

The agencies highlighted declining foreign aid and widening gaps in routine immunization, noting that measles outbreaks have increased globally, with approximately 11 million cases reported in 2024.Kate O’Brien said growing politicization of vaccines and health issues posed a serious concern, even as trust in frontline health workers remained relatively strong.

Sania Nishtar pointed to the role of social media in amplifying misinformation, saying digital platforms often incentivize the spread of misleading or false content about vaccines.

Ephrem Lemango added that algorithm-driven amplification of anti-vaccine narratives, combined with reductions in global health funding, could undermine progress and risk reversing gains made through the campaign.

Officials have emphasized that the public risk remains low, citing the country’s strong vaccination record and proactive monitoring measures.

The discovery marks the first detection of the wild form of poliovirus in Germany since environmental testing for polio began in 2021.

It also comes more than three decades after the nation recorded its last human cases of wild poliovirus infection, underscoring the importance of continuous surveillance even in countries where the disease has been long eradicated.

Hamburg officials said the positive sample was collected during the week of October 6. The city’s health department promptly established a dedicated task force focused on infection control and environmental monitoring.

The team will work closely with national health experts to collect additional samples and assess any potential risks.

Authorities explained that the wastewater sample contained material from both Hamburg and parts of neighboring federal states. Because of this, it remains unclear where exactly the virus entered the sewage system or whether it came from one or multiple individuals.

Experts have reassured the public that the likelihood of local transmission is very low. The wild poliovirus currently exists primarily in Afghanistan and Pakistan, where health agencies continue eradication efforts.

In countries like Germany, high vaccination coverage provides strong protection against both wild and vaccine-derived forms of the virus.

Poliomyelitis, commonly known as polio, is a viral infection that can cause paralysis or death in severe cases.

However, it is fully preventable through vaccination. The World Health Organization continues to emphasize that maintaining high immunization rates is the best defense against any potential resurgence of the disease.

Health specialists believe the discovery in Hamburg highlights the importance of ongoing monitoring even in polio-free regions.

Wastewater testing has become an essential public health tool, allowing authorities to detect traces of infectious agents before they cause outbreaks in communities.

Beate Kampmann, scientific director at the Center for Global Health at Charité University Hospital in Berlin, said that the finding serves as a reminder of how interconnected global health remains.

“Polio anywhere means a potential risk of polio everywhere,” she noted, stressing that sustained global vaccination efforts and financial support are crucial for permanent eradication.

The Robert Koch Institute, Germany’s public health authority, has stated that there is no cause for alarm. Officials have reiterated that no human infections have been reported and that vaccination coverage across Germany remains consistently high.

To further ensure safety, authorities plan to expand wastewater surveillance in Hamburg and nearby regions. The aim is to determine whether the detection was an isolated occurrence or part of a wider pattern.

The results will help guide any future public health responses and reinforce Germany’s preparedness against potential reintroductions of the virus.

Local and national agencies continue to collaborate closely to manage the situation with transparency and caution.

Health experts have also encouraged citizens to verify their vaccination status and participate in booster programs if needed, emphasizing that prevention remains the most effective approach.

The detection of the wild poliovirus in Hamburg does not indicate an outbreak but serves as an important signal for maintaining vigilance.

Germany’s proactive response demonstrates its commitment to safeguarding public health and contributing to the global mission of eradicating polio once and for all.

Authorities are expected to release further updates as additional testing and analysis are completed. For now, officials maintain that the discovery reflects the effectiveness of Germany’s surveillance system rather than a sign of renewed risk.

Continued cooperation between global health organizations and national authorities will remain key to keeping polio a disease of the past.