Surgical Site Infections in Tanzania: A Five-Year Trend and Variation Analysis of National Surveillance Data, 2021-2025
This retrospective analysis of national surveillance data from 138 Tanzanian health facilities (2021–2025) reveals that while overall surgical site infection rates declined alongside a surge in surgical volume, persistent increases in caesarean section infections and higher rates in primary-level facilities underscore the urgent need for strengthened perioperative infection prevention and control measures.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of a preprint that has not been peer-reviewed. It is not medical advice. Do not make health decisions based on this content. Read full disclaimer
Every time a surgeon makes an incision, they open a door for bacteria to enter the body. When these germs take hold in the wound, they cause a surgical site infection. These infections are a major global health challenge, occurring in hospitals everywhere. They are not just a minor setback; they can lead to severe illness, longer stays in the hospital, and the need for more powerful medicines. In countries with fewer resources, where supplies like sterile gloves and clean water can be scarce, the risk is even higher. For years, doctors and health officials in Tanzania have worked to prevent these infections, but they lacked a clear, nationwide picture of how well their efforts were working. Without a complete map of the problem, it is difficult to know where to send help or how to fix the gaps in care.
To fill this gap, a team of researchers in Tanzania decided to look at five years of records from hospitals and clinics across the country. They gathered data from a national digital system used to track health services, pulling information from 138 different health facilities between 2021 and 2025. This was a massive undertaking, covering nearly 420,000 surgical procedures. The researchers wanted to see if the rate of infections was going up or down over time and whether some types of hospitals or specific kinds of surgeries were more prone to trouble than others. They focused on three main categories of infection: those affecting just the skin, those reaching deeper into the muscle and tissue, and those affecting the organs inside the body.
The results of this five-year review offer a story of both progress and persistent challenges. Overall, the rate of surgical site infections dropped slightly, moving from 3.1 percent of all surgeries in 2021 to 2.4 percent in 2025. This decline happened even though the number of surgeries performed increased dramatically, with facilities reporting over 127,000 procedures in the final year compared to fewer than 10,000 at the start. This suggests that infection prevention measures are working to some degree, keeping pace with the growing demand for surgery. However, the improvement was not uniform across the board. The researchers found that the biggest drop occurred in the most serious type of infection, those affecting the organs and spaces deep inside the body, which fell significantly from 1.2 percent to 0.3 percent. This is a promising sign, as these deep infections are often the most dangerous and costly to treat.
Despite this success with deep infections, other areas showed worrying trends. Infections related to cesarean sections, the surgery used to deliver babies, did not go down; instead, they rose slightly from 1.8 percent to 2.0 percent over the five years. This increase is concerning because it puts mothers at higher risk for complications. Furthermore, the location of the surgery mattered greatly. Primary-level facilities, which are smaller clinics and health centers serving local communities, reported much higher infection rates than the large, specialized hospitals. In these primary facilities, the infection rate hovered around 5.4 percent, significantly higher than the rates seen in tertiary hospitals. The data also revealed that the type of ownership—whether a facility was run by the government or a private group—did not consistently predict safety, with infection rates varying in complex ways depending on the level of care.
The study concludes that while Tanzania has made strides in reducing the most severe surgical infections, the work is far from finished. The rise in infections after cesarean sections and the high rates in primary care centers highlight specific areas where attention is needed. The researchers suggest that strengthening infection control practices, particularly in obstetric care and smaller health centers, is essential. By focusing resources where the data shows the most risk, health officials can continue to improve the safety of surgery for millions of people. This large-scale look at routine data proves that tracking infections over time is a powerful tool, turning raw numbers into a clear guide for saving lives.
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