{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,27]],"date-time":"2025-08-27T08:10:02Z","timestamp":1756282202413,"version":"3.44.0"},"reference-count":17,"publisher":"BMJ","issue":"1","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2024,1,2]]},"published-print":{"date-parts":[[2024,1]]},"abstract":"<jats:p>Bacterial pneumonia causes significant morbidity and mortality especially in elderly and immunocompromised hosts. Achromobacter xylosoxidans denitrificans pneumonia is very rarely reported. However, the reported cases have been in patients who are either immunocompromised or have bronchiectasis. We hereby present a unique case of Achromobacter xylosoxidans denitrificans pneumonia in an immunocompetent patient with advanced chronic obstructive pulmonary disease (COPD). Our patient is a Caucasian male admitted with shortness of breath, fever and cough. Chest X-ray demonstrated right-sided infiltrates and he was treated with intravenous ceftriaxone and azithromycin. He was discharged home on oral amoxicillin-clavulanate 875\u2013125\u2009mg two times per day for a total of 7\u2009days. Patient returned to emergency room after 5 weeks with persistent symptoms and chest X-ray revealed persistent right-sided infiltrate and sputum culture showed Achromobacter xylosoxidans denitrificans. The patient was started on oral levofloxacin 750\u2009mg one time per day for 2\u2009weeks with resolution of symptoms.<\/jats:p>","DOI":"10.1136\/bcr-2022-254306","type":"journal-article","created":{"date-parts":[[2024,1,10]],"date-time":"2024-01-10T01:11:34Z","timestamp":1704849094000},"page":"e254306","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Achromobacter pneumonia in a patient with advanced COPD, a diagnostic challenge"],"prefix":"10.1136","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0713-2930","authenticated-orcid":false,"given":"Aisha","family":"Batool","sequence":"first","affiliation":[{"name":"Nephrology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shahzad","family":"Chaudhry","sequence":"additional","affiliation":[{"name":"Advocate Aurora Health Inc, Milwaukee, Wisconsin, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Khadija","family":"Batool","sequence":"additional","affiliation":[{"name":"Services Institute of Medical Sciences, Lahore, Punjab, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Muhammad Ali","family":"Omar","sequence":"additional","affiliation":[{"name":"Robert Wood Johnson Health System, West Orange, New Jersey, 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