Structural implementation profiles of Antimicrobial Stewardship programmes in German hospitals: Evidence from an explorative cluster-analysis

Hospitals are places where the body's natural defenses are often overwhelmed, and where doctors must rely on powerful medicines to fight back. Among the most vital of these medicines are antibiotics, drugs designed to kill bacteria and save lives. However, these drugs are not infinite resources. When they are used too often or incorrectly, the bacteria they are meant to destroy learn how to survive them, becoming resistant and turning once-curable infections into deadly threats. To prevent this, hospitals use a strategy called antimicrobial stewardship. This is not a single action but a system of rules, teams, and habits designed to ensure that antibiotics are used only when necessary, in the right dose, and for the right amount of time. The goal is to protect patients today while preserving the effectiveness of these drugs for tomorrow. In Germany, where hospitals vary greatly in size and resources, the question has long been how well these systems are actually working. Are the rules just on paper, or are they part of daily life? And what makes one hospital better at this than another?

To answer these questions, a team of researchers conducted a massive survey across the country, speaking directly to the doctors and pharmacists who do the work every day. They did not look at patient records or hospital budgets; instead, they asked the experts themselves about the structures in place at their institutions. They wanted to know if there were dedicated teams, if there were specific staff members paid to oversee these programs, and if the hospital had the digital tools to track which drugs were being used. The researchers gathered responses from professionals in 253 different acute care hospitals, ranging from small community facilities to large medical centers. By asking these specific questions, they hoped to move beyond a simple checklist of "yes" or "no" answers and instead see the bigger picture of how these programs actually look in the real world.

The researchers used a method that allowed the data to group the hospitals naturally, rather than forcing them into pre-made categories. They found that the hospitals fell into two distinct groups. One group represented hospitals with a high level of implementation, where the stewardship programs were robust and active. The other group represented hospitals with a lower level of implementation, where these programs were either minimal or missing key components. The difference between these two groups was not random; it was driven by specific, tangible factors. The hospitals that were doing the best were the ones that had dedicated people working on the problem. They had staff members whose jobs were specifically to manage antibiotic use, and they had teams that included specialists in infectious diseases. These hospitals also held regular rounds where doctors and pharmacists walked the wards together to review patient cases and adjust treatments on the spot.

In contrast, the hospitals with lower implementation levels often lacked these dedicated human resources. They might have had a plan on paper, but they did not have the staff time or the specialized expertise to carry it out effectively. The study showed that when a hospital had a dedicated team and a specialist on board, they were much more likely to perform complex tasks, such as analyzing data to see how antibiotics were being used across the entire hospital or running surveys to check if doctors were following the rules. Without these people, the hospitals tended to stick to the bare minimum. Interestingly, the researchers found that some tasks were being done almost everywhere, regardless of the hospital's size or resources. These were the tasks required by law, such as reporting data on how many antibiotics were used and what bacteria were resistant to them. Because these were legal mandates, hospitals had to do them, and they did them well. However, the more advanced, voluntary activities that could truly improve patient care were the ones that varied the most.

The size of the hospital also played a significant role in these findings. Larger hospitals, which naturally have more beds and more staff, were more likely to have the advanced, high-level programs. The researchers found that for every additional 100 beds a hospital had, its chances of having a well-implemented program increased. This makes sense, as larger institutions have more resources to hire the necessary experts. However, the study also revealed something surprising about university hospitals. While these prestigious institutions are often assumed to be the leaders in medical innovation, being a university hospital did not automatically mean a hospital had a better antibiotic program. Once the size of the hospital was taken into account, the university status itself did not make a difference. This suggests that the key to success is not the prestige of the institution, but simply the availability of people and the commitment to use them.

The researchers also looked at how different parts of the system fit together. They found that having a dedicated team and a specialist in infectious diseases acted as a foundation. When these were present, other good practices tended to follow, such as better communication between doctors and the use of electronic systems to track prescriptions. However, the study also highlighted areas where progress was slow. Many hospitals struggled with the tedious but important work of documenting exactly why a specific antibiotic was chosen for a patient, or mandating that doctors re-evaluate a patient's treatment after two or three days. These tasks were rarely done, even in the better-performing hospitals. The researchers suspect this is because these tasks require significant time and effort, and without digital tools to make them easier, they are often skipped in the rush of daily patient care.

Ultimately, the study paints a clear picture of the current state of antibiotic stewardship in Germany. It shows that while the legal requirements are being met, the deeper, more effective work depends heavily on having the right people in the right roles. The difference between a hospital that is merely compliant and one that is truly effective comes down to whether it has invested in dedicated staff and specialized expertise. The researchers suggest that to improve antibiotic use across the country, the focus should be on strengthening these core human resources. By ensuring that hospitals have the people they need to lead these programs, and by focusing on the indicators that truly matter, the country can move toward a future where antibiotics remain effective for everyone. The path forward is not about more rules or more paperwork, but about giving the experts the time and support they need to do their jobs.