Faucets and keyboards as major reservoirs for Gram-negative bacilli in a regional hospital in Northeast Brazil

Infections related to healthcare assistance represent a major public health problem worldwide, and the main etiological agents associated with these infections are microorganisms also found on inanimate hospital surfaces. Therefore, understanding the dynamics of bacterial contamination of hospital surfaces is essential for professionals working in these services. Objective: To evaluate the contamination of inanimate surfaces by Gram-negative bacilli (GNB) in a Regional Hospital in Northeast Brazil. Methods: This is an observational and cross-sectional study. Samples were collected from different hospital wards using a sterile swab soaked in saline solution. They were then plated on MacConkey agar and incubated at 36°C for 48 hours. The bacterial isolates were counted and identified using the Gram staining method, TSI agar, and oxidase test. Results: Out of the 150 samples collected, 71 showed no microbiological growth, 11 showed growth of filamentous fungi, and 66 showed growth of Colony Forming Units (CFU). A total of 132 morphologically distinct colonies were identified, with 55 identified as yeasts and 77 as GNB. In the evaluation of hospital wards, the Adult Emergency Room and the Orthopedic Surgical Clinic showed the highest growth of GNB. Regarding the surfaces studied, the most contaminated were faucets, computer keyboards, mattresses, and beds. Conclusions: Hospital areas with higher human traffic are the most contaminated, particularly on frequently handled objects. Therefore, it is necessary to focus on disinfecting these surfaces to break the transmission chain of these etiological agents.