A recent study conducted in Yaounde, Cameroon, has shed light on the bacteriological profiles of surgical site infections (SSIs) and hospital environments. The research, which took place from September 2020 to October 2021, involved seven surgical departments in four healthcare facilities. The study aimed to compare the bacterial profiles of infected surgical sites and the physical, material, and airborne environments in these departments. This initiative is crucial in understanding the causes of SSIs, which are a major cause of postoperative morbidity.
The study recorded 103 cases of SSIs out of 2059 patients operated on, giving a prevalence of 5%. A total of 278 strains representing 17 bacterial species were isolated from infected surgical sites. The predominant bacteria were S. aureus (17.7%), Klebsiella spp. (11.2%), Enterococcus spp. (9.4%), and Pseudomonas spp. (8.7%). These findings highlight the significance of SSIs as a postoperative complication in surgical patients.
In addition to the SSI samples, 202 strains belonging to 19 bacterial species were isolated from hospital environments. The most frequent isolates were Streptococcus spp., Staphylococcus spp., and Enterobacter spp. Notably, air samples showed the highest contamination rates, followed by work surfaces. This information underscores the role of hospital environments as potential reservoirs for pathogens responsible for SSIs.
To compare the bacterial profiles of SSIs and hospital environments, the researchers used the Sørensen similarity index. The results showed that the similarity indices between clinical and environmental isolates ranged from 42.1% to 69.3%. The most common concordant species were Streptococcus spp., S. aureus, and Enterococcus spp. These findings suggest a link between the bacterial profiles of SSIs and hospital environments.
The study's results have significant implications for infection control practices in healthcare facilities. The high similarity between the bacterial profiles of SSIs and hospital environments emphasizes the need for strengthened environmental microbiological monitoring and hygiene measures. This is in line with recommendations from the Centers for Disease Control and Prevention (CDC) to prevent SSIs.
The researchers collected pus samples from each SSI and environmental samples using the settle plate method for air, and swab samples from surfaces, equipment, and medical devices. These samples underwent standard microbiological analysis to establish bacterial profiles. The use of robust sampling and analysis methods adds credibility to the study's findings.
The study's conclusions highlight the importance of controlling hospital environments to prevent SSIs. By understanding the bacteriological profiles of SSIs and hospital environments, healthcare facilities can develop targeted infection control strategies. This may involve enhanced cleaning and disinfection protocols, improved sterilization of equipment, and stricter hygiene practices among healthcare workers.
Key points
- The study found a 5% prevalence of surgical site infections among 2059 patients operated on in Yaounde, Cameroon.
- The predominant bacteria isolated from infected surgical sites were S. aureus, Klebsiella spp., Enterococcus spp., and Pseudomonas spp.
- The Sørensen similarity index showed a significant link between the bacterial profiles of SSIs and hospital environments, ranging from 42.1% to 69.3%.
