scholarly journals Research Trends and Hotspots of Q Fever Research: A Bibliometric Analysis 1990-2019

2022 ◽  
Vol 2022 ◽  
pp. 1-14
Muhammad Farooq ◽  
Aman Ullah Khan ◽  
Hosny El-Adawy ◽  
Katja Mertens-Scholz ◽  
Iahtasham Khan ◽  

Q fever is a worldwide distributed zoonosis caused by Coxiella burnetii, a Gram-negative bacterium. Despite existence of large amount of research data on the developments related to Q fever, no bibliometric analysis of this subject is available to our knowledge. Bibliometric studies are an essential resource to track scholarly trends and research output in a subject. This study is aimed at reporting a bibliometric analysis of publications related to Q fever (2,840 articles published in the period 1990-2019) retrieved from Science Citation Index Expanded, an online database of Clarivate Analytics Web of Science Core Collection. Data was retrieved using keywords “Q fever” or “Coxiella burnetii” in title, abstract, and author keywords to describe important research indicators such as the kind and language of articles, the most important publications, research journals and categories, authors, institutions, and the countries having the most significant contribution to this subject. Finally, the emerging areas in field of diagnosis, host range, and clinical presentation were identified. Word cluster analysis of research related to Q fever revealed that major focus of research has been on zoonosis, seroprevalence, laboratory diagnosis (mainly using ELISA and PCR), clinical manifestations (abortion and endocarditis), vectors (ticks), and hosts (sheep, goat, and cattle). This bibliometric study is intended to visualize the existing research landscape and future trends in Q fever to assist in future knowledge exchange and research collaborations.

2021 ◽  
Vol 9 (11) ◽  
pp. 2373
Rima Jeske ◽  
Larissa Dangel ◽  
Leander Sauerbrey ◽  
Dimitrios Frangoulidis ◽  
Lauren R. Teras ◽  

The causative agent of Q fever, the bacterium Coxiella burnetii (C. burnetii), has gained increasing interest due to outbreak events and reports about it being a potential risk factor for the development of lymphomas. In order to conduct large-scale studies for population monitoring and to investigate possible associations more closely, accurate and cost-effective high-throughput assays are highly desired. To address this need, nine C. burnetii proteins were expressed as recombinant antigens for multiplex serology. This technique enables the quantitative high-throughput detection of antibodies to multiple antigens simultaneously in a single reaction. Based on a reference group of 76 seropositive and 91 seronegative sera, three antigens were able to detect C. burnetii infections. Com1, GroEL, and DnaK achieved specificities of 93%, 69%, and 77% and sensitivities of 64%, 72%, and 47%, respectively. Double positivity to Com1 and GroEL led to a combined specificity of 90% and a sensitivity of 71%. In a subgroup of seropositives with an increased risk for chronic Q fever, the double positivity to these markers reached a specificity of 90% and a sensitivity of 86%. Multiplex serology enables the detection of antibodies against C. burnetii and appears well-suited to investigate associations between C. burnetii infections and the clinical manifestations in large-scale studies.

2017 ◽  
Vol 20 (4) ◽  
pp. 190-193

Q fever is caused by an anthropozoonosis determined by the pathogen Coxiella burnetii, a gram-negative bacterium with intracellular growth. The occurrence of infection in the human species takes place through inhalation of contaminated aerosols or dust from infected domestic animals (cattle, sheep, goats) and more rarely through ingestion of unpasteurized milk, infected mite or inter-human transmission. The endocardium is one of the main infection sites, especially in the context of the long-term development of the disease, and cardiac decompensation often leads to death in absence of a proper diagnosis and appropriate treatment (1).We present the case of a patient of the male sex aged 37 years without personal pathologic history known admitted in “St. Parascheva” Clinical Hospital for Infectious Diseases Iasi complaining of productive cough, fatigue, shortness of breath with moderate effort and pain in the left scapulohumeral joint with irradiation in the left upper limb. Clinical examination objectified digital clubbing, systolic/diastolic murmurs throughout the precordium area and hepato-splenomegaly, while laboratory tests revealed the presence of inflammatory syndrome, cholestasis and hepatic cytolysis. Echocardiography shows a hyperechogenic entity at the level of the aortic valve, as well as a severe valve disorder. The diagnosis of infective endocarditis is established on aortic valve and therapy with first-choice antibiotics, consisting of triple combination of cefotaxime, amikacin and vancomycin, is initiated. Blood cultures taken upon admission were negative, while positive serological phase I and II tests for C. burnetii urged the indication of changing therapy with doxycycline and trimethoprim sulfamethoxazole (in the absence of hydroxychloroquine). Subsequently he underwent aortic valve replacement. The particularities of this case consisted in atypical clinical manifestations, the absence of fever and epidemiological context suggestive for Q fever.

2012 ◽  
Vol 17 (6) ◽  
pp. 38-40
A. A. Nafeev ◽  
V. V. Bezik

Coxiellosis (Q-fever) is a systemic natural focal zooanthroponosis disease, which has a very wide geographical area. A variety of clinical manifestations and the absence of pathognomonic signs of illness forces to use for making a definite diagnosis complex of techniques including epizootological, epidemiological data, clinical manifestations, and certainly the results of several serological tests designed to detect antibodies to Coxiella burnetii. There is presented a description of an acute case of Q - fever in a child in the subject, characterized as trouble-free of Coxiellosis from 70-ies of the last century.

2017 ◽  
Vol 22 (4) ◽  
pp. 200-207
Valery A. Malov ◽  
A. N Gorobchenko ◽  
N. M Gyulazyan ◽  
E. A Nemilostiva ◽  
N. N Kanshina ◽  

The review article coniders modern information on etiology, epidemiology of Q-fever, pathogenetic mechanisms promoting Coxiella burnetii bacteria to wear down the protective systems of the macroorganism and contribute to the development of the chronic course of the disease. Clinical manifestations of Q-fever in acute and chronic forms are considered in detail, problems of early diagnosis and treatment tactics are discussed.

Pathogens ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1075
Salvatore Ledda ◽  
Cinzia Santucciu ◽  
Valentina Chisu ◽  
Giovanna Masala

Q fever is a zoonosis caused by Coxiella burnetii, a Gram-negative pathogen with a complex life cycle and a high impact on public and animal health all over the world. The symptoms are indistinguishable from those belonging to other diseases, and the disease could be symptomless. For these reasons, reliable laboratory tests are essential for an accurate diagnosis. The aim of this study was to validate a novel enzyme-linked immunosorbent assay (ELISA) test, named the Chorus Q Fever Phase II IgG and IgM Kit (DIESSE, Diagnostica Senese S.p.A), which is performed by an instrument named Chorus, a new device in medical diagnostics. This diagnostic test is employed for the detection of antibodies against C. burnetii Phase II antigens in acute disease. Our validation protocol was performed according to the Italian Accreditation Body (ACCREDIA) (Regulation UNI CEI EN ISO/IEC 17025:2018 and 17043:2010), OIE (World Organization for Animal Health), and Statement for Reporting Studies of Diagnostic Accuracy (STARD). Operator performance was evaluated along with the analytical specificity and sensitivity (ASp and ASe) and diagnostic accuracy of the kit, with parameters such as diagnostic specificity and sensitivity (DSp and DSe) and positive and negative predictive values (PPV and NPV), in addition to the repeatability. According to the evaluated parameters, the diagnostic ELISA test was shown to be suitable for validation and commercialization as a screening method in human sera and a valid support for clinical diagnostics.

npj Vaccines ◽  
2021 ◽  
Vol 6 (1) ◽  
Carrie M. Long ◽  
Paul A. Beare ◽  
Diane C. Cockrell ◽  
Jonathan Fintzi ◽  
Mahelat Tesfamariam ◽  

AbstractCoxiella burnetii is the bacterial causative agent of the zoonosis Q fever. The current human Q fever vaccine, Q-VAX®, is a fixed, whole cell vaccine (WCV) licensed solely for use in Australia. C. burnetii WCV administration is associated with a dermal hypersensitivity reaction in people with pre-existing immunity to C. burnetii, limiting wider use. Consequently, a less reactogenic vaccine is needed. Here, we investigated contributions of the C. burnetii Dot/Icm type IVB secretion system (T4BSS) and lipopolysaccharide (LPS) in protection and reactogenicity of fixed WCVs. A 32.5 kb region containing 23 dot/icm genes was deleted in the virulent Nine Mile phase I (NMI) strain and the resulting mutant was evaluated in guinea pig models of C. burnetii infection, vaccination-challenge, and post-vaccination hypersensitivity. The NMI ∆dot/icm strain was avirulent, protective as a WCV against a robust C. burnetii challenge, and displayed potentially altered reactogenicity compared to NMI. Nine Mile phase II (NMII) strains of C. burnetii that produce rough LPS, were similarly tested. NMI was significantly more protective than NMII as a WCV; however, both vaccines exhibited similar reactogenicity. Collectively, our results indicate that, like phase I LPS, the T4BSS is required for full virulence by C. burnetii. Conversely, unlike phase I LPS, the T4BSS is not required for vaccine-induced protection. LPS length does not appear to contribute to reactogenicity while the T4BSS may contribute to this response. NMI ∆dot/icm represents an avirulent phase I strain with full vaccine efficacy, illustrating the potential of genetically modified C. burnetii as improved WCVs.

Loïc Epelboin ◽  
Carole Eldin ◽  
Pauline Thill ◽  
Vincent Pommier de Santi ◽  
Philippe Abboud ◽  

Abstract Purpose of Review In this review, we report on the state of knowledge about human Q fever in Brazil and on the Guiana Shield, an Amazonian region located in northeastern South America. There is a contrast between French Guiana, where the incidence of this disease is the highest in the world, and other countries where this disease is practically non-existent. Recent Findings Recent findings are essentially in French Guiana where a unique strain MST17 has been identified; it is probably more virulent than those usually found with a particularly marked pulmonary tropism, a mysterious animal reservoir, a geographical distribution that raises questions. Summary Q fever is a bacterial zoonosis due to Coxiella burnetii that has been reported worldwide. On the Guiana Shield, a region mostly covered by Amazonian forest, which encompasses the Venezuelan State of Bolivar, Guyana, Suriname, French Guiana, and the Brazilian State of Amapá, the situation is very heterogeneous. While French Guiana is the region reporting the highest incidence of this disease in the world, with a single infecting clone (MST 117) and a unique epidemiological cycle, it has hardly ever been reported in other countries in the region. This absence of cases raises many questions and is probably due to massive under-diagnosis. Studies should estimate comprehensively the true burden of this disease in the region.

Tosin Yinka Akintunde ◽  
Taha Hussein Musa ◽  
Hassan Hussein Musa ◽  
Shaojun Chen ◽  
Elhakim Ibrahim ◽  

Placenta ◽  
2021 ◽  
Ourlad Alzeus G. Tantengco ◽  
Federico Cristobal C. De Jesus ◽  
Eloina Faye S. Gampoy ◽  
Eric David B. Ornos ◽  
Manuel S. Vidal ◽  

2012 ◽  
Vol 80 (6) ◽  
pp. 1980-1986 ◽  
Laura J. MacDonald ◽  
Richard C. Kurten ◽  
Daniel E. Voth

ABSTRACTCoxiella burnetiiis the bacterial agent of human Q fever, an acute, flu-like illness that can present as chronic endocarditis in immunocompromised individuals. Following aerosol-mediated transmission,C. burnetiireplicates in alveolar macrophages in a unique phagolysosome-like parasitophorous vacuole (PV) required for survival. The mechanisms ofC. burnetiiintracellular survival are poorly defined and a recent Q fever outbreak in the Netherlands emphasizes the need for better understanding this unique host-pathogen interaction. We recently demonstrated that inhibition of host cyclic AMP-dependent protein kinase (PKA) activity negatively impacts PV formation. In the current study, we confirmed PKA involvement in PV biogenesis and probed the role of PKA signaling duringC. burnetiiinfection of macrophages. Using PKA-specific inhibitors, we found the kinase was needed for biogenesis of prototypical PV andC. burnetiireplication. PKA and downstream targets were differentially phosphorylated throughout infection, suggesting prolonged regulation of the pathway. Importantly, the pathogen actively triggered PKA activation, which was also required for PV formation by virulentC. burnetiiisolates during infection of primary human alveolar macrophages. A subset of PKA-specific substrates were differentially phosphorylated duringC. burnetiiinfection, suggesting the pathogen uses PKA signaling to control distinct host cell responses. Collectively, the current results suggest a versatile role for PKA inC. burnetiiinfection and indicate virulent organisms usurp host kinase cascades for efficient intracellular growth.

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