Antimicrobial susceptibility of respiratory Haemophilus influenzae strains isolated from pediatric respiratory tract infections

BACKGROUND: Haemophilus influenzae (H. influenzae) is the most frequent bacterial pathogen of respiratory tract infections in children. Detection of antimicrobial susceptibility of H. influenzae is necessary for institution of appropriate antibiotic treatments. METHODS: A total of 281 strains of H. influenzae isolated from sputum samples of 281 pediatric patients with respiratory tract infections were recruited for study. Antibiotic susceptibility was determined by assessing minimum inhibitory concentrations (MIC) of antimicrobial agents. MIC were measured by utility of Agar dilution susceptibility test. RESULTS: Of the total, 38 (13.5%) strains produced beta-lactamase (BLP), 56 (19.9%) strains were beta-lactamase non-producing, ampicillin resistant (BLNAR). The overall resistant proportion to ampicillin was 33.4%. The data indicated that sulbactam/ampicillin, cefotaxime, ceftriaxone and cefditoren are effective against BLP strains. In addition, a high prevalence of BLNAR H. influenzae strains was identified, with an overall isolation rate of 19.9%. Those strains mainly demonstrated intermediate level to ampicillin (ampicillin-MIC 相似文献   

Prevalence and intensity of Cephalobium microbivorum (Nematoda: Diplogasterida) infection in three species of Gryllus field crickets

Here we report on the results of a survey for nematode parasites in three species of field cricket, Gryllus integer, Gryllus lineaticeps, and an undescribed Gryllus species. The nematode, Cephalobium microbivorum, was recovered from the intestine of the crickets. To our knowledge, this paper is just one of two to report on the biology of C. microbivorum. This nematode was first described from the cricket, Gryllus assimilis. It has not been documented in any other Gryllus species to date. G. integer were collected from two locations: Aguila, Arizona and Davis, California. G. lineaticeps were collected from Davis, CA and an undescribed species of Gryllus cricket was collected from Aguila, AZ. Results of the survey revealed the presence of nematodes in all three species of Gryllus, at all collection sites. The intensity of infection ranged from 1 to 113 nematodes.