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On day 4 of hospitalization, he developed dyspnea, and chest computed tomography (CT) revealed ground-glass opacities and reticular shadows in both lungs, predominantly in the left upper lobe. Aspiration pneumonia was initially suspected, and cefmetazole was administered. However, by day 11, his respiratory status deteriorated, with SpO\u2082 dropping to 90%. A follow-up chest CT showed progression of bilateral ground-glass opacities. Further testing revealed an elevated \u03b2-<jats:sc>d<\/jats:sc>-glucan level of 142.5\u00a0pg\/mL and KL-6 level of 1.770\u00a0U\/mL, along with a positive sputum PCR for <jats:italic>Pneumocystis jirovecii<\/jats:italic>, confirming a diagnosis of pneumocystis pneumonia (PCP). As human immunodeficiency virus (HIV) testing was negative, he was diagnosed with non-HIV PCP. Despite treatment with trimethoprim\u2013sulfamethoxazole and hydrocortisone, he died on day 17. Notably, his peripheral lymphocyte count was below 500\/\u03bcL before admission, suggesting that cirrhosis-associated immune dysfunction (CAID) contributed to his susceptibility to non-HIV PCP. This case highlights the importance of monitoring peripheral lymphocyte counts in patients with advanced liver cirrhosis, as CAID may increase the risk of life-threatening infections such as non-HIV PCP. <\/jats:p>","DOI":"10.1007\/s12328-025-02149-4","type":"journal-article","created":{"date-parts":[[2025,6,3]],"date-time":"2025-06-03T01:25:55Z","timestamp":1748913955000},"page":"714-720","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A case of non-HIV pneumocystis pneumonia in a patient with cirrhosis-associated immune dysfunction"],"prefix":"10.1007","volume":"18","author":[{"given":"Kai","family":"Miyamoto","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshihito","family":"Uchida","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shohei","family":"Tsuji","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mie","family":"Inao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kayoko","family":"Sugawara","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masamitsu","family":"Nakao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nobuaki","family":"Nakayama","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yukinori","family":"Imai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Suguru","family":"Mizuno","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Satoshi","family":"Mochida","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,6,3]]},"reference":[{"key":"2149_CR1","doi-asserted-by":"publisher","first-page":"1385","DOI":"10.1016\/j.jhep.2014.08.010","volume":"61","author":"A Albillos","year":"2014","unstructured":"Albillos A, Lario M, \u00c1lvarez-Mon M. 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