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Query: UMLS:C0026936 (Mycoplasma)
 14,761 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Clinical usage of aztreonam (AZT), a newly synthesized antibiotic which belongs to monobactam, was evaluated for its efficacy and safety in 22 patients aged from 1 month-old to 13 year-5 month-old with bacterial infections and the following results were obtained. AZT was administered to 4 patients with pyelonephritis and 10 patients with tonsillitis at a daily dosage of 40.4-120.9 mg/kg and to 5 patients with clinical sepsis associated with agranulocytosis caused by intensive antileukemic therapy at a daily dosage of 142.4-171.4 mg/kg, divided into 3 or 4, by intravenous injection or by 30 minutes drip infusion. The clinical results of these 19 evaluable patients were as follows: excellent; 10 cases, good; 5 cases, fair; 2 cases, poor; 2 cases. The over all efficacy rate was 78.9% and that of pyelonephritis and tonsillitis was 100.0%. No clinical side effects were observed in any 23 patients, including a patient who proved to be suffering from Mycoplasma pneumoniae infection, and no abnormal laboratory findings caused by AZT was noticed. The MICs of AZT against 9 strains isolated from patients with pyelonephritis and those with tonsillitis were as follows: MICs against all of 3 strains of K. pneumoniae were less than 0.05 microgram/ml. MICs against 2 out of 4 strains of H. influenzae were less than 0.05 microgram/ml and those of the remaining 2 strains were 0.10 microgram/ml. MIC against 1 strain of S. aureus was 1.56 microgram/ml. MIC against 1 strain of S. epidermidis was more than 100 micrograms/ml.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:[Clinical evaluation of aztreonam in children]. 409 60

Blood mononuclear cells were stimulated in vitro by 7 different microbial preparations, and thymidine incorporation was investigated in 7 groups of persons sensitized to the microorganisms and in 7 groups of controls. The sensitized persons were: 18 BCG-vaccinated, 13 with previous Mycoplasma pneumoniae pneumonia, 22 who had serum antibodies to Herpes simplex virus, 14 with previous typhoid fever, 13 with previous acute pyelonephritis caused by Eschrerichia coli, 6 with previous Haemophilus influenzae meningitis, and 15 tetanus-vaccinated persons. Employing microbial preparations corresponding to the type of sensitization, higher responses were obtained with PPD, Mycoplasma pneumoniae, Herpes simplex virus, Salmonella typhi and tetanus toxoid in sensitized than in controls, but the responses to E. coli and H. influenzae were similar. In each experiment a dose titration of the microbial preparation was carried out. The best separation between sensitized and non-sensitized persons was obtained at low concentrations, giving submaximal stimulation. It is concluded that lymphocyte responses to many microbial preparations are combined of antigen-specific components and of responses to cross-reacting or polyclonally activating moieties, and that the antigen-specific response is best investigated at low concentrations of these preparations.
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PMID:Specificity of lymphocyte stimulation in vitro by microbial preparations: importance of antigen concentration. 617 67

Like in any infection, the choice of antibacterials in pulmonary infections of known bacterial etiology is simple. When etiology is not known, the choice must rest upon knowledge of the epidemiology of lower respiratory infections and the antibacterial spectrum of the antibiotics in question. The epidemiology of community-acquired lower respiratory infections is not too well studied. However, some studies indicate that approximately 50% of lower respiratory infections are caused by bacteria among which Streptococcus pneumoniae prevails, followed by Haemophilus influenzae. Streptococci, Branhamella catarrhalis and other Neisseria species, staphylococci and Enterobacteriaceae account for less than 10% each. The prevalence of Legionella pneumophila is unknown, but it is of limited significance. Mycoplasma pneumoniae varies in prevalence according to time and geographic area. In acute exacerbations of chronic bronchitis, the epidemiology is similar, except that H. influenzae is more commonly found than pneumococci. The traditional strong position of penicillin in the blind, primary treatment of community-acquired lower respiratory infections is challenged by the increasing frequency of penicillin-resistant H. influenzae and the discovery of new agents not sensitive to penicillins. The same can be said for the more recently introduced primary treatment with erythromycin. However, most community-acquired infections in the lower respiratory tract respond to penicillin; tetracycline or erythromycin may be used for treatment when the clinical response is unsatisfactory. In patients who are known or suspected to have compromised host defense, beta-lactams such as ureido-penicillins and the new cephalosporins should be used as primary therapy. In hospital-acquired lower respiratory tract infections, the etiological diagnosis is more likely to be made.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Beta-lactam antibiotics in lower respiratory tract infections. 659 58

Four cases of membranous laryngotracheobronchitis (MLTB) are presented. This entity is defined as an inflammation of larynx, trachea and bronchi, with mucopurulent membranes adhered to subglottic space wall. Radiological study shows irregularity of the proximal tracheal mucosa as well as adhered membranes resembling foreign bodies. Two out of the four children suffered from measles and one had staphylococcal pleuropneumonia. Tracheal aspirate obtained by laryngoscopy yielded S. aureus in two cases, and beta-lactamase positive H. influenzae in another. All patients required nasotracheal intubation and antibiotherapy. Characteristics of MLTB are discussed, pointing out its difference from viral laryngotracheobronchitis. Possibility of MLTB being initially a viral process undergoing bacterial superinfection later on is analyzed.
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PMID:[Membranous laryngotracheobronchitis]. 670 32

The microbiology of otitis media (OM) has been documented by cultures of middle ear fluid (MEF) obtained by needle aspiration. The results of studies of bacteriology of OM from Sweden, Finland and the United States are very similar: Streptococcus pneumoniae and Haemophilus influenzae are the most important pathogens: Gram-negative enteric bacilli are isolated from MEF of approximately equal to 20% of infants to six weeks of age but are rarely present in MEF of older children; group A beta hemolytic streptococcus and Staphylococcus aureus are infrequent causes of otitis. Preliminary results suggest that anaerobic bacteria are responsible for some episodes of OM. Although epidemiologic data suggest that virus infection is associated with OM, the results of ten studies indicate that these agents are infrequently isolated from MEF of children with OM. Viruses were isolated from 29 to 663 patients (4.4%). Respiratory syncytial virus and influenza virus were isolated most frequently. The results of seven studies of mycoplasma infection in 771 patients with OM included only one isolation of Mycoplasma pneumoniae from MEF. These results indicate that viruses and mycoplasmas are uncommonly found in MEF of patients with OM, but few studies have been attempted in recent years. Chlamydia trachomatosis is the etiologic agent of a mild but prolonged pneumonia in infants. OM may accompany the respiratory infection, and C. trachomatis has been isolated from MEF of some of these infants. Recent studies of asymptomatic children with persistent MEF indicate that bacterial pathogens are present in some of these fluids. Investigators in Columbus, Boston, and Pittsburgh obtained MEF for culture at the time of myringotomy or placement of tympanostomy tubes. Bacteria were isolated from MEF of 50% of these children; S. pneumoniae, H. influenzae, or group A streptococcus were isolated from 10% to 20% of cases. There were only minimal differences in the rates of isolation of bacteria from serous, mucoid, or purulent fluids. The significance of these results is uncertain, but they suggest that the persistent effusion may be a result of asymptomatic but prolonged infection or may be an immune response to a persisting antigen.
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PMID:Microbiology of otitis media. 677 62

Lower respiratory disease is a major source of morbidity in military recruits, with hospitalization rates for pneumonia more than 30 times that of the non-recruit population. The etiologic agent remains unknown in over 75% of cases. This study prospectively examined the etiology of pneumonia among recruits at Naval Training Center, San Diego, California. Recruits presenting with cough, fever, or shortness of breath and pulmonary infiltrates on chest X-ray were eligible for enrollment. A standardized scoring form and focused physical exam were completed on each subject. Sputum specimens were obtained for Gram's stain and culture, DNA probing for Legionella and Mycoplasma species, and direct fluorescent antibody staining for Legionella. Acute and convalescent serologies were performed for adenovirus, influenza A and B, Mycoplasma pneumoniae, Chlamydia group, and respiratory syncytial virus. Of 110 eligible patients, 100 consented to enrollment and 75 patients completed the study. Etiologic diagnoses were obtained in 40 of the patients (53%). M. pneumoniae, Haemophilus influenzae, and viruses accounted for the majority of infections. Mixed infections were seen in six patients. Forty-seven percent of patients had no diagnosis established. Pneumonia in this series of military recruits was frequently caused by M. pneumoniae and H. influenzae. Fifty percent of cases were undiagnosed with routinely available laboratory methods. Further studies are warranted to more clearly define the etiologic agents of recruit pneumonia and the utility of prophylactic measures.
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PMID:Pneumonia in military recruits. 787 Mar 17

We performed transtracheal aspiration (TTA) in 1165 patients, who were suspected to have bronchopulmonary infection, from December 1978 to March 1993. We isolated pathogens from TTA in 806 patients (69.2%). We isolated H. influenzae (62 cases), S. pneumoniae (39 cases) and M. catarrhalis (24 cases) in patients with acute bronchitis, S. pneumoniae (65 cases), alpha-Streptococcus sp. (52 cases), H. influenzae (32 cases) and S. aureus (29 cases) in patients with pneumonia or lung abscess and H. influenzae (174 cases), S. pneumoniae (84 cases), P. aeruginosa (81 cases) and M. catarrhalis (42 cases) in patients with chronic lower respiratory tract infection. Anaerobic bacteria isolated from TTA included Peptostreptococcus sp. (19 cases), Bacteroides sp. (19 cases) and others. Mycoplasma pneumoniae was isolated from TTA in 8 patients with pneumonia without other organisms. Virus isolated from TTA included Rhinovirus (6 cases) and others. These results suggest that various pathogens affect the pathogenesis of bronchopulmonary infection. Therefore, we must diagnose the bronchopulmonary infection by the correct methods such as TTA.
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PMID:[An evaluation of pathogens in patients with bronchopulmonary infection by transtracheal aspiration: December 1978-March 1993]. 799 25

In most cases of respiratory tract infection, antibiotic therapy has to be initiated before the results of microbiological examination are available. The four most common pathogens of acute exacerbations of chronic bronchitis are pneumococci, Haemophilus influenzae, Moraxella catarrhalis and Staphylococcus aureus. Pneumococci are the predominant pathogens of community-acquired pneumonia, followed by H. influenzae and staphylococci. Legionella, mycoplasma and chlamydia vary in frequency according to the population studied. Staphylococci, Pseudomonas, Enterobacter and Klebsiella spp. as well as H. influenzae are the major pathogens of secondary pneumonia. For reasons of cost and environmental problems, oral antibiotics ought to be used whenever possible considering the severity of the infection and patient circumstance. Parenteral antibiotics are indicated in severe infections in order to provide high therapeutic drug levels. Second generation cephalosporins are appropriate for initial therapy of lower respiratory tract infections. In case of severe infection, cephalosporins should be combined with an aminoglycoside, ureidopenicillin or quinolone. Cefuroxime has shown good clinical efficacy and tolerance in lower respiratory tract infections.
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PMID:[Parenteral cephalosporins for the treatment of lower respiratory tract infections]. 831 90

The etiology of acute pneumonia was studied in 596 pediatric inpatients at Chiba Municipal Kaihin Hospital between January 1990 and December 1991. A pathogen was identified in 389 (64.4%) episodes of pneumonia. Evidence of bacterial infection was present in 167 (28.8%) episodes, viral infection in 178 (29.9%) and Mycoplasma pneumoniae infection in 89 (14.9%). The major bacterial pathogens were H. influenzae 117 (19.6%), S. pneumoniae 51 (8.6%), M (B). catarrhalis 24 (4.0%). RS virus was the most common respiratory virus. The peak age of the patients was 7 months to 2 years old. For bacterial pneumonia, the highest rates occurred in infants. Mycoplasma pneumonia produced the highest rates in school-age children. Mycoplasma pneumonia was prevalent at two distinct times, the first emerging in the spring of 1990 and emerging again in the autumn of 1991. RS virus and influenza virus epidemics occur during the winter. Most of the parainfluenza virus have been observed during the early summer season.
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PMID:[Etiology of pediatric inpatients with pneumonia]. 836 May 19

Respiratory tract infections (RTIs) are among the most frequent infections in man and lower tract infections account substantially for the overall mortality in hospitals. Regarding the etiology of pneumonias, one has to consider different pathogenic mechanisms, age of the patients, underlying diseases, concomitant medications, symptomatologies, seasonal influences, and clinical conditions, e.g. intensive care environment and mechanical ventilation. To optimize the rational management of respiratory infections, identification of the etiologic agent would be desirable. The decision of how to treat is often based on epidemiologic, clinical, and radiological assessments. Epidemiologic studies have shown a pronounced difference in the etiologic spectrum between community- and hospital-acquired RTIs. In community-acquired pneumonias, pneumococci, Haemophilus influenzae, Legionella, Mycoplasma and viruses predominate, whereas in nosocomially acquired pneumonias, Enterobacteriaceae, e.g. Klebsiella, Proteus, Enterobacter as well as Pseudomonas and staphylococci comprise the most frequent isolates. Empirical therapy has to cover all possible etiologic pathogens which most likely cause the infection. In addition, an adequate kinetic profile, e.g. once or twice daily dosing, sufficient pulmonary tissue or fluid penetration, and acceptable tolerance and costs are prerequisites for optimal therapy. Drugs of choice for the treatment of community-acquired pneumonia are aminobenzylpenicillins or macrolides. Oral cephalosporins exhibit excellent activity against many bacterial pathogens of typical community-acquired pneumonia, and are active against beta-lactamase-producing H. influenzae.
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PMID:Clinical requirements in the treatment of today's respiratory tract infections. 848 87


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