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CMV infection was raised as an early differential and antiviral treatment was started without delay. This case study, therefore, makes the case for increased awareness of the possibility of, and recognition of CMV pneumonitis among healthcare professionals as a way of preventing significant morbidity and mortality. It also raises awareness of checking for slow metabolisers of azathioprine before initiation to look for individuals who may be at increased risk of azathioprine\u2019s adverse effects.<\/jats:p>","DOI":"10.1136\/bcr-2020-241256","type":"journal-article","created":{"date-parts":[[2021,4,23]],"date-time":"2021-04-23T10:46:33Z","timestamp":1619174793000},"page":"e241256","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":3,"title":["CMV pneumonitis in a patient with Crohn\u2019s disease taking azathioprine"],"prefix":"10.1136","volume":"14","author":[{"given":"Timothy Zef","family":"Hawthorne","sequence":"first","affiliation":[{"name":"Respiratory Medicine, Aintree University Hospital, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rachel","family":"Shellien","sequence":"additional","affiliation":[{"name":"Respiratory Medicine, Aintree University Hospital, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lucy","family":"Chambers","sequence":"additional","affiliation":[{"name":"Respiratory Medicine, Aintree University Hospital, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Graham","family":"Devereux","sequence":"additional","affiliation":[{"name":"Respiratory Medicine, Aintree University Hospital, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK"},{"name":"Respiratory Medicine, Liverpool School of Tropical Medicine, Liverpool, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2021,4,23]]},"reference":[{"key":"2025082800455391000_14.4.e241256.1","unstructured":"Centers for Disease Control and Prevention . About cytomegalovirus (CMV): centers for disease control and prevention, 2020. Available: https:\/\/www.cdc.gov\/cmv\/overview.html [Accessed 7 Nov 2020]."},{"key":"2025082800455391000_14.4.e241256.2","doi-asserted-by":"crossref","first-page":"515","DOI":"10.6061\/clinics\/2015(07)09","article-title":"Cytomegalovirus infection in transplant recipients","volume":"70","author":"Azevedo","year":"2015","journal-title":"Clinics"},{"key":"2025082800455391000_14.4.e241256.3","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0200267"},{"key":"2025082800455391000_14.4.e241256.4","unstructured":"Centers for Disease Control and Prevention . Babies born with congenital cytomegalovirus (CMV): centers for disease control and prevention, 2020. 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