Which of the following infections is Cephalexin NOT indicated for?

Cephalexin is a first-generation cephalosporin antibiotic often prescribed for infections caused by gram-positive bacteria. It is primarily indicated for various bacterial infections, including skin infections, respiratory infections, and certain bone infections.

In the case of chronic bronchitis, the condition is usually characterized by inflammation of the bronchial tubes and often involves a persistent cough with mucus production. The infections associated with chronic bronchitis are often due to atypical bacteria or viruses, which may not respond effectively to Cephalexin. Additionally, the treatment of chronic bronchitis may more appropriately involve antibiotics that target specific pathogens or may not require antibiotics at all, depending on the underlying cause.

On the other hand, Cephalexin is commonly indicated for otitis media, osteomyelitis, and impetigo, as these conditions involve bacterial pathogens that are sensitive to Cephalexin. Thus, chronic bronchitis is not an appropriate indication for this antibiotic, making it the correct choice in this scenario.