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By Liping Tang, PhD

Infection is the single most likely cause of delayed healing in chronic wounds. In most cases, identification of chronic wound infection (e.g., diabetic foot ulcers and venous leg ulcers) is not obvious because chronic wounds do not exhibit the same classic inflammatory signs of infection as those found in acute wounds. More arduously, those common signs of infection—pain, erythema, heat, and purulent exudate— vary as we age and occur differently in those with underlying diseases or weakened immune systems. Diagnosis is generally based on the doctors’ experience and could be confirmed with microbiological culture of tissue biopsy. However, culture could take a few days, and the results may not always be reliable because of sampling error. A fast and accurate diagnosis of wound infection would relieve the patient of significant discomfort and improve the treatment outcome.

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