The clinical features of respiratory infections caused by the Streptococcus anginosus group View Full Text


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Article Info

DATE

2015-10-26

AUTHORS

Shingo Noguchi, Kazuhiro Yatera, Toshinori Kawanami, Kei Yamasaki, Keisuke Naito, Kentaro Akata, Ikuko Shimabukuro, Hiroshi Ishimoto, Chiharu Yoshii, Hiroshi Mukae

ABSTRACT

BackgroundThe Streptococcus anginosus group (SAG) play important roles in respiratory infections. It is ordinarily difficult to distinguish them from contaminations as the causative pathogens of respiratory infections because they are often cultured in respiratory specimens. Therefore, it is important to understand the clinical characteristics and laboratory findings of respiratory infections caused by the SAG members. The aim of this study is to clarify the role of the SAG bacteria in respiratory infections.MethodsA total of 30 patients who were diagnosed with respiratory infections which were caused by the SAG bacteria between January 2005 and February 2015 were retrospectively evaluated.ResultsRespiratory infections caused by the SAG were mostly seen in male patients with comorbid diseases and were typically complicated with pleural effusion. Pleural effusion was observed in 22 (73.3%) patients. Empyema was observed in half of the 22 patients with pleural effusion. S. intermedius, S. constellatus and S. anginosus were detected in 16 (53.3 %), 11 (36.7 %) and 3 (10.0 %) patients, respectively. Six patients had mixed-infections. The duration from the onset of symptoms to the hospital visit was significantly longer in “lung abscess” patients than in “pneumonia” patients among the 24 patients with single infections, but not among the six patients with mixed-infection. The peripheral white blood cell counts of the “pneumonia” patients were higher than those of the “lung abscess” patients and S. intermedius was identified significantly more frequently in patients with pulmonary and pleural infections (pneumonia and lung abscess) than in patients with bacterial pleurisy only. In addition, the patients in whom S. intermedius was cultured were significantly older than those in whom S. constellatus was cultured.ConclusionsRespiratory infections caused by the SAG bacteria tended to be observed more frequently in male patients with comorbid diseases and to more frequently involve purulent formation. In addition, S. intermedius was mainly identified in elderly patients with having pulmonary infection complicated with pleural effusion, and the aspiration of oral secretions may be a risk factor in the formation of empyema thoracis associated with pneumonia due to S. intermedius. More... »

PAGES

133

References to SciGraph publications

  • 2012-03-06. Milleri group streptococcus—a stepchild in the viridans family in EUROPEAN JOURNAL OF CLINICAL MICROBIOLOGY & INFECTIOUS DISEASES
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    http://scigraph.springernature.com/pub.10.1186/s12890-015-0128-6

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    http://dx.doi.org/10.1186/s12890-015-0128-6

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    https://app.dimensions.ai/details/publication/pub.1030425352

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/26502716


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    33 schema:description BackgroundThe Streptococcus anginosus group (SAG) play important roles in respiratory infections. It is ordinarily difficult to distinguish them from contaminations as the causative pathogens of respiratory infections because they are often cultured in respiratory specimens. Therefore, it is important to understand the clinical characteristics and laboratory findings of respiratory infections caused by the SAG members. The aim of this study is to clarify the role of the SAG bacteria in respiratory infections.MethodsA total of 30 patients who were diagnosed with respiratory infections which were caused by the SAG bacteria between January 2005 and February 2015 were retrospectively evaluated.ResultsRespiratory infections caused by the SAG were mostly seen in male patients with comorbid diseases and were typically complicated with pleural effusion. Pleural effusion was observed in 22 (73.3%) patients. Empyema was observed in half of the 22 patients with pleural effusion. S. intermedius, S. constellatus and S. anginosus were detected in 16 (53.3 %), 11 (36.7 %) and 3 (10.0 %) patients, respectively. Six patients had mixed-infections. The duration from the onset of symptoms to the hospital visit was significantly longer in “lung abscess” patients than in “pneumonia” patients among the 24 patients with single infections, but not among the six patients with mixed-infection. The peripheral white blood cell counts of the “pneumonia” patients were higher than those of the “lung abscess” patients and S. intermedius was identified significantly more frequently in patients with pulmonary and pleural infections (pneumonia and lung abscess) than in patients with bacterial pleurisy only. In addition, the patients in whom S. intermedius was cultured were significantly older than those in whom S. constellatus was cultured.ConclusionsRespiratory infections caused by the SAG bacteria tended to be observed more frequently in male patients with comorbid diseases and to more frequently involve purulent formation. In addition, S. intermedius was mainly identified in elderly patients with having pulmonary infection complicated with pleural effusion, and the aspiration of oral secretions may be a risk factor in the formation of empyema thoracis associated with pneumonia due to S. intermedius.
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    44 addition
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    49 bacteria
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    51 blood cell count
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    53 cell count
    54 characteristics
    55 clinical characteristics
    56 clinical features
    57 comorbid diseases
    58 constellatus
    59 contamination
    60 count
    61 disease
    62 duration
    63 effusion
    64 elderly patients
    65 empyema
    66 empyema thoracis
    67 factors
    68 features
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    70 formation
    71 group
    72 half
    73 hospital visits
    74 important role
    75 infection
    76 intermedius
    77 laboratory findings
    78 lung
    79 male patients
    80 members
    81 onset
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    83 oral secretions
    84 pathogens
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    86 peripheral white blood cell count
    87 pleural effusion
    88 pleural infection
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    90 pneumonia
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    92 respiratory infections
    93 respiratory specimens
    94 risk factors
    95 role
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    97 single infection
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