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Background  Cellulitis is a common infection of the skin and subcutaneous tissues. It is associated with significant morbidity from necrosectomies and amputations especially in sub-Saharan Africa. We aimed at identifying the risk factors and burden of lower limb cellulitis to inform preventive strategies in Cameroon.    Methods  This was a hospital–based case-control study carried out in the Bamenda Regional Hospital (BRH) between September 2015 and August 2016. Cases were defined as consenting adults admitted to the surgical unit who presented with a localised area of lower limb erythema, warmth, oedema and pain, associated with fever (temperature ≥ 38 °C) and/or chills of sudden onset. Controls were adults hospitalised for diseases other than cellulitis, necrotising fasciitis, myositis, abscess or other variants of dermo-hypodermitis. Cases and controls were matched (1:2) for age and sex.    Results  Of the 183 participants (61 cases of cellulitis and 122 controls) included in the study, the median age was 52 years [Interquartile range (IQR): 32.5–74.5]. After controlling for potential confounders, obesity [adjusted odds ratio (AOR) = 4.7, 95% CI (1.5–14.7);  p  = 0.009], history of skin disruption [AOR = 12.4 (3.9–39.1);  p  < 0.001], and presence of toe-web intertrigo [AOR = 51.4 (11.7–225.6);  p  < 0.001] were significantly associated with cellulitis. Median hospital stay was longer (14 days [IQR: 6–28]) in cases compared to the controls (3 days [IQR: 2–7]). Among the cases, Streptococci species were the most frequent ( n  = 50, 82%) isolated germ followed by staphylococci species ( n  = 9, 15%). Patients with cellulitis were more likely to undergo necrosectomy (OR: 21.2; 95% CI: 7.6–59.2). Toe-web intertrigo had the highest (48.9%) population attributable risk for cellulitis, followed by history of disruption of skin barrier (37.8%) and obesity (20.6%).    Conclusion  This study showed a high disease burden among patients with cellulitis. While risk factors identified are similar to prior literature, this study provides a contextual evidence-base for clinicians in this region to be more aggressive in management of these risk factors to prevent disease progression and development of cellulitis.

Risk factors of lower limb cellulitis in a level-two healthcare facility in Cameroon: a case-control study