Pulmonary Manifestations of Babesiosis and Predictors of Mortality from a Quaternary Care Center in Westchester, New York.

Babesiosis is an emerging tick-borne illness, and pulmonary manifestations have not been well described previously. This is a single-center, retrospective study of hospitalized adults with confirmed babesiosis at Westchester Medical Center (Valhalla, NY, USA) from 2006 to 2023. Descriptive analysis was used to summarize the demographic and clinical data. Logistic regression was used to determine factors associated with severe disease and mortality. A total of 147 cases were reviewed; 63 were severe, 41 were admitted to the intensive care unit, and ten died. Respiratory symptoms were observed in 42% of cases (cough, dyspnea, oxygen supplementation, respiratory failure). A total of 55 patients had an abnormal chest radiograph (infiltrates, pleural effusions), and 75% of severe cases had parasitemia ≥ 10%. Factors associated with severe cases included age ≥ 70 years, severe dyspnea, radiographic abnormalities, white blood cell count > 5000 cells/dL, hemoglobin 8 g/dL or less, and increased creatinine. Lyme seropositivity was common (28%). Exchange transfusion did not correlate with outcome. Increased mortality was more likely in patients 70 years or older or in those having any of the following: encephalopathy, acute kidney injury, severe dyspnea on admission, abnormal chest radiograph, and requiring intubation. In conclusion, pulmonary symptoms including abnormal chest radiograph are not uncommon in babesiosis and are associated with worse outcomes.