A study reveals that the use of doxycycline may help protect against Clostridioides difficile (C. diff) infection for some patients with pneumonia. Specifically, study authors found that for hospitalized patients with community-acquired pneumonia who had experienced C. diff infections in the prior year, the use of doxycycline, instead of the more commonly used azithromycin, reduced the development of new C. diff infections by 45%. More than a third of patients who suffer a C. diff infection will go on to have another in the future. For patients who are admitted to a hospital with pneumonia, clinical guidelines typically recommend the...