Результаты поиска

The intracellular agent of Q fever, Coxiella burnetii, alters human alveolar macrophage metabolism and mitochondrial physiology.

Coxiella burnetii, the etiologic agent of Q fever, is a gram-negative intracellular bacterium that infects humans via contaminated aerosols typically while working with livestock. C. burnetii initially targets alveolar macrophages (AMs) to establish a growth niche within a phagolysosome-like compartment termed the Coxiella-containing vacuole (CCV). C. burnetii deploys a type IV secretion system (T4SS) to secrete effector proteins that control host cell functions to benefit the bacterium, orchestrating an immunosuppressive, pro-bacterial environment for replication to high numbers. Although mul…

Case Report: Coxiella burnetii vertebral osteomyelitis in a pigeon breeder: mNGS diagnosis of chronic Q fever.

BACKGROUND: Isolated vertebral osteomyelitis represents an uncommon manifestation of chronic Q fever, posing significant diagnostic challenges. We report a case of Coxiella burnetii-induced spondylodiscitis confirmed via metagenomic next-generation sequencing (mNGS). CASE REPORT: A 52-year-old male with occupational avian exposure (pigeon breeder) presented with chronic low back pain persisting for over 1 year, refractory to serial epidural corticosteroid injections. Lumbar MRI demonstrated multifocal osteomyelitis (L3-L5) with associated intraspinal abscess. mNGS analysis of aspirate identif…

Case Series of Q Fever Infection: A 15-year Experience at Sultan Qaboos University Hospital, Oman.

OBJECTIVES: Q fever is a worldwide zoonosis, yet its prevalence may be underestimated due to the challenges in diagnosis. We present a series of cases where patients were treated for Q fever infection based primarily on their clinical features and available laboratory tests, highlighting the difficulties in establishing the diagnosis. METHODS: This 15-year case series was observed from January 2009 to November 2023 at Sultan Qaboos University Hospital, Oman. Relevant patient information was obtained from the electronic hospital records under the ethical approval MREC # 3139. RESULTS: We trea…

Case report: a missed case of chronic Q fever infective endocarditis demonstrating the ongoing diagnostic challenges.

Diagnosis of chronic Q fever is often difficult for clinicians, particularly in the presence of a second pathology. In addition to the chronic constitutional symptoms, the most common manifestations of chronic Q fever include infective endocarditis and endovascular infection. We describe a case of prosthetic valve infective endocarditis caused by both Streptococcus sanguinis and Coxiella burnetti on a background of a previous aortic graft and bioprosthetic aortic valve replacement 2 years earlier. The diagnosis of chronic Q fever infective endocarditis was delayed because the significance of t…

Rare case of chronic Q fever myocarditis in end stage heart failure patient: A case report.

BACKGROUND: Q fever myocarditis is a rare disease manifestation of Q fever infection caused by Coxiella burnetii. It is associated with significant morbidity and mortality if left untreated. Prior studies have reported myocarditis in patients with acute Q fever. We present the first case of chronic myocarditis in an end-stage heart failure patient with chronic Q fever infection. CASE SUMMARY: A 69-year-old male was admitted with dyspnea on exertion, hypotension and bilateral lower extremity edema for a few months. He has a past medical history of ischemic cardiomyopathy with left ventricular …

Neurotransmitter System-Targeting Drugs Antagonize Growth of the Q Fever Agent, Coxiella burnetii, in Human Cells.

Coxiella burnetii is a highly infectious, intracellular, Gram-negative bacterial pathogen that causes human Q fever, an acute flu-like illness that can progress to chronic endocarditis. C. burnetii is transmitted to humans via aerosols and has long been considered a potential biological warfare agent. Although antibiotics, such as doxycycline, effectively treat acute Q fever, a recently identified antibiotic-resistant strain demonstrates the ability of C. burnetii to resist traditional antimicrobials, and chronic disease is extremely difficult to treat with current options. These findings high…

Screening for Q Fever in Patients Undergoing Transcatheter Aortic Valve Implantation, Israel, June 2018-May 2020.

Q fever infective endocarditis frequently mimics degenerative valvular disease. We tested for Coxiella burnettii antibodies in 155 patients in Israel who underwent transcatheter aortic valve implantation. Q fever infective endocarditis was diagnosed and treated in 4 (2.6%) patients; follow-up at a median 12 months after valve implantation indicated preserved prosthetic valvular function.

Unravelling animal exposure profiles of human Q fever cases in Queensland, Australia, using natural language processing.

Q fever, caused by the zoonotic bacterium Coxiella burnetii, is a globally distributed emerging infectious disease. Livestock are the most important zoonotic transmission sources, yet infection in people without livestock exposure is common. Identifying potential exposure pathways is necessary to design effective interventions and aid outbreak prevention. We used natural language processing and graphical network methods to provide insights into how Q fever notifications are associated with variation in patient occupations or lifestyles. Using an 18-year time-series of Q fever notifications in …

Serum C-reactive protein and procalcitonin values in acute Q fever, scrub typhus, and murine typhus.

BACKGROUND: Although C-reactive protein (CRP) and procalcitonin (PCT) are widely used inflammatory markers for infectious diseases, their role and potential application for rickettsioses were rarely studied. METHODS: A retrospective chart review and serological study were conducted in patients with rickettsioses. The clinical presentations, characteristics, laboratory data, and treatment responses were recorded and their associations with CRP and PCT values were analyzed. RESULTS: A total of 189 cases of rickettsioses, including 115 cases of acute Q fever (60.8%), 55 cases of scrub typhus (2…

Screening for Q Fever during Other Bacterial Endocarditis in Endemic Areas: Our Experience with Three Patients.

Endocarditis is not a usual manifestation of acute Q fever. There is an ongoing debate about the need to screen patients for valvular diseases after acute Q fever. We present, for the first time, three patients with bacterial endocarditis from different aetiologies and a simultaneous diagnosis of acute Q fever. All were treated with prolonged antimicrobial treatment, and none of them developed a persistent Q infection. We suggest screening patients with endocarditis from other aetiologies to Q fever.

Persistence of impaired health status of Q fever patients 4 years after the first Dutch outbreak.

A significant proportion of Q fever patients from the first Dutch Q fever outbreak in 2007 showed impairment in health status up to 1 year after infection. Interested in whether this decrease in health status persisted, we set out to determine the health status in the same cohort of patients, 4 years after primary infection and to compare health status scores at the individual patient level between 1 and 4 years follow-up. Health status was assessed with the Nijmegen Clinical Screening Instrument (NCSI). Patients were serologically tested to exclude patients with possible, probable or proven c…

Long-term persistence after acute Q fever of non-infective Coxiella burnetii cell components, including antigens.

BACKGROUND: Previous studies of inciting factors for a prolonged post-infection fatigue syndrome after Q fever (variously termed QFS or Q fever associated CFS/ME in the literature) showed that after the acute infection a high proportion of asymptomatic and QFS patients had Q fever antibody and also low levels in PBMC and bone marrow of Coxiella burnetii (C.b.) DNA with PCR assays directed against three different target sequences in different parts of the coxiella genome. Attempts to isolate a strain of C.b. in A/J mice, and cell culture from PCR positive PBMC and bone marrow were consistently …

Коксиелла ожогетти выживает в моноцитах от пациентов с эндокардитом Q: участие некроза опухоли.

Эндокардит является самой распространенной формой хронической лихорадки Q, инфекционной болезнью, вызванной коксиеллой. Поскольку это обязывает внутриклеточный бактерий обитает в моноцитах и макрофагах, мы задались вопросом, связан ли патогенез Q лихорадочного эндокардита с дефектным внутриклеточным убийством C. signetii моноцитами. Моноциты от здорового контроля в течение 3 дней ликвидировали вирулент C. sergetii. В противоположность этому, моноциты пациентов с сохраняющимся эндокардитом лихорадки Q не смогли ликвидировать бактерии даже через 6 дней. У пациентов, излечившихся от эндокардита,

Совпадение в аннотации оригинала
Endocarditis is the most frequent form of chronic Q fever, an infectious disease caused by Coxiella burnetii. As this obligate intracellular bacterium inhabits monocytes and macrophages, we wondered if pathogenesis of Q fever endocarditis is related to defective intracellular killing of C. burnetii by monocytes. Monocytes from healthy controls eliminated vir…

A refined guinea pig model for evaluating delayed-type hypersensitivity reactions caused by Q fever vaccines.

The previously established model for determining dermal granulomatous reactivity of Q fever vaccines uses footpad injections to sensitize Hartley guinea pigs. We describe a substantial refinement to that model by substituting an alternate injection route and replacing the model with the hairless Hartley guinea pig. The experimental design incorporates a matrix of various antigen and adjuvant combinations administered by subcutaneous (SC) and intradermal routes of administration. The two Coxiella burnetii antigens evaluated were phase-I whole-cell vaccine (WCV) and phase-I chloroform-methanol r…

Scheuer PJ, McDonald JR,+MACDONALD JR: A case of non-bacterial endocarditis due to Q fever.

A case of chronic Q fever is described, presenting as a problem of endocarditis of six years' duration with negative blood cultures. The Q-fever endocarditis was superimposed on pre-existing rheumatic mitral valve disease. In spite of four months' treatment with tetracycline the patient died of intractable cardiac failure. At necropsy, inclusion bodies were found in macrophages in the mitral valve, and an organism, probably a strain of Rickettsia burneti, was isolated from post-mortem material. A review of eight previously reported cases of chronic Q-fever endocarditis from this country has sh…

Prevalence and risk factors for Q fever, spotted fever group rickettsioses, and typhus group rickettsioses in a pastoralist community of northern Tanzania, 2016-2017.

BACKGROUND: In northern Tanzania, Q fever, spotted fever group (SFG) rickettsioses, and typhus group (TG) rickettsioses are common causes of febrile illness. We sought to describe the prevalence and risk factors for these zoonoses in a pastoralist community. METHODS: Febrile patients ≥2 years old presenting to Endulen Hospital in the Ngorongoro Conservation Area were enrolled from August 2016 through October 2017. Acute and convalescent blood samples were collected, and a questionnaire was administered. Sera were tested by immunofluorescent antibody (IFA) IgG assays using Coxiella burnetii (P…