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Metagenomic next-generation sequencing (mNGS) is a new technology used to diagnose infectious diseases. However, clinical experience with applying the test to rickettsioses and Q fever is relatively limited. Therefore, this study aimed to explore the diagnostic performance of mNGS in detecting <jats:italic>Rickettsia<\/jats:italic> and <jats:italic>C. burnetii<\/jats:italic>.\u00a0We retrospectively studied patients with rickettsioses or Q fever between August 2021 and July 2022. Peripheral blood mNGS and polymerase chain reaction (PCR) were performed for all patients. Clinical data were retrieved for analysis.\u00a0Thirteen patients were included in this study (eleven confirmed cases and two suspected cases). Signs and symptoms included fever (13, 100%), rash (7, 53.8%), muscle soreness (5, 38.5%), headache (4, 30.8%), skin eschar (3, 23.1%), and disturbance of consciousness (2, 15.4%). In addition, eight patients (61.6%) had thrombocytopenia, ten (76.9%) had liver function impairment, and two (15.4%) had renal function impairment. The results of mNGS revealed seven patients with <jats:italic>R. japonica<\/jats:italic> (53.8%), five with <jats:italic>C. burneti<\/jats:italic> (38.5%), two with <jats:italic>R. heilongjiangensis<\/jats:italic> (15.4%), and one with <jats:italic>R. honei<\/jats:italic> (7.7%). PCR results were positive in 11 patients (84.6%). After receiving doxycycline-based treatment, 12 (92.3%) patients returned to a normal temperature within 72\u00a0h. All patients were discharged in better health. Therefore, mNGS can help diagnose <jats:italic>Rickettsia and C. burnetii<\/jats:italic> and shorten the diagnosis time, especially for patients with atypical clinical manifestations and unclear epidemiologic evidence of a tick bite or exposure.<\/jats:p>","DOI":"10.1007\/s10096-023-04586-w","type":"journal-article","created":{"date-parts":[[2023,4,3]],"date-time":"2023-04-03T15:43:08Z","timestamp":1680536588000},"page":"681-689","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":37,"title":["Clinical usefulness of metagenomic next-generation sequencing for Rickettsia and Coxiella burnetii diagnosis"],"prefix":"10.1007","volume":"42","author":[{"given":"Xuan","family":"Zhang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huixin","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dongsheng","family":"Han","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2892-5956","authenticated-orcid":false,"given":"Wei","family":"Wu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,3,30]]},"reference":[{"issue":"4","key":"4586_CR1","doi-asserted-by":"publisher","first-page":"719","DOI":"10.1128\/CMR.18.4.719-756.2005","volume":"18","author":"P Parola","year":"2005","unstructured":"Parola P, Paddock CD, Raoult D (2005) Tick-borne rickettsioses around the world: emerging diseases challenging old concepts. 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