Susceptibility of group B and group G streptococci to newer antimicrobial agents

1986 ◽  
Vol 5 (5) ◽  
pp. 534-536 ◽  
Author(s):  
K. V. I. Rolston
Keyword(s):  
Antimicrobial Agents ◽  
Group G Streptococci ◽  
Group B

Approach to the Febrile Patient with No Obvious Focus of Infection

1984 ◽  
Vol 5 (10) ◽  
pp. 305-315
Author(s):  
Sarah S. Long
Keyword(s):  
Antimicrobial Agents ◽  
Group B Streptococcus ◽  
Invasive Disease ◽  
Chemotherapeutic Agents ◽  
The Body ◽  
Therapeutic Modalities ◽  
Body Of Knowledge ◽  
Age Related ◽  
Focus Of Infection ◽  
Group B

The summary in Table 1 could be used as a mental checklist for the pediatrician who examines a child with fever. Whether the pediatrician opts to "keep the rules" or appropriately decides to "break the rules," knowledge of the guidelines will help him to focus his approach and to adopt attitudes of caution in certain circumstances. The body of knowledge of infectious agents chemotherapeutic agents has burgeoned over the past 40 years; the rules have changed very little. Thus, the rules might also serve as standards against which "new discoveries" that dictate departure from an established mode of clinical practice would have to be weighed. The adage, "Name the bug before you choose a drug," is especially germaine to pediatrics. Potential pathogens or "bugs" continually change as the patient's age, exposure, and immunity change. The serious diseases they cause mandate that initial treatment be given with the best "drugs." The age-related causes of bacterial meningitis presented in Table 2 could serve as a primer for age-related causes of other invasive disease as well. For bone, joint, and soft tissue infection as well as for septicemia without a focus the age line for group B Streptococcus and H influenzae would be extended upward and S aureus would be added for all ages. Although the relative importance of each pathogen for each clinical entity might vary, therapeutic considerations would be appropriately served by a schema such as this. Unfortunately, the susceptibility of pathogens to antimicrobial agents will continue to change. Fortunately, new and potentially better therapeutic agents will continue to be discovered or invented. When new problems of antibiotic resistance emerge or when superior therapeutic modalities are proved, the pediatrician must be knowledgeable of such events and be prepared for change.

scholarly journals Serotype Distribution, Population Structure, and Antimicrobial Resistance of Group B Streptococcus Strains Recovered from Colonized Pregnant Women

2016 ◽  
Vol 55 (2) ◽  
pp. 412-422 ◽  
Author(s):  
Sarah Teatero ◽  
Patricia Ferrieri ◽  
Irene Martin ◽  
Walter Demczuk ◽  
Allison McGeer ◽  
...  
Keyword(s):  
Population Structure ◽  
Pregnant Women ◽  
Antimicrobial Agents ◽  
Vaccine Development ◽  
Group B Streptococcus ◽  
Tetracycline Resistance ◽  
The United States ◽  
High Rate ◽  
Content Type ◽  
Group B

ABSTRACTUsing serotyping, multilocus sequence typing, and whole-genome sequencing (WGS) of selected strains, we studied the population structure of 102 group BStreptococcus(GBS) isolates prospectively sampled in 2014 from vaginal/rectal swabs of healthy pregnant women in metropolitan Toronto, Canada. We also determined the susceptibilities of each of the colonizing isolates to penicillin, erythromycin, clindamycin, tetracycline, and other antimicrobial agents. Overall, we observed a high rate of tetracycline resistance (89%) among colonizing GBS isolates. We found resistance to erythromycin in 36% of the strains, and 33% were constitutively or inducibly resistant to clindamycin. The most frequently identified serotypes were III (25%), Ia (23%), and V (19%). Serotype IV accounted for 6% of the colonizing isolates, a rate consistent with that observed among patients with invasive GBS infections in metropolitan Toronto. The majority of serotype IV isolates belonged to sequence type (ST)459, a tetracycline-, erythromycin-, and clindamycin-resistant ST first identified in Minnesota, which is considered to be the main driver of serotype IV GBS expansion in North America. WGS revealed that ST459 isolates from Canada are clonally related to colonizing and invasive ST459 organisms circulating in regions of the United States. We also used WGS to study recombination in selected colonizing strains from metropolitan Toronto, which revealed multiple episodes of capsular switching. Present and future circulating GBS organisms and their genetic diversity may influence GBS vaccine development.

scholarly journals Analysis of virulence factors and antibiotic resistance genes in Group B Streptococcus from clinical samples

2020 ◽  
Author(s):  
Raymond Mudzana ◽  
Rooyen T Mavenyengwa ◽  
Muchaneta Gudza-Mugabe
Keyword(s):  
Antibiotic Resistance ◽  
Pregnant Women ◽  
Resistance Genes ◽  
Virulence Genes ◽  
Antimicrobial Agents ◽  
Antibiotic Resistance Genes ◽  
Penicillin G ◽  
Multi Drug Resistance ◽  
Clinical Samples ◽  
Group B

Abstract Background: Streptococcus agalacticae (Group B Streptococcus, GBS) is one of the most important causative agents of serious infections among neonates. This study was carried out to identify antibiotic resistance and virulence genes associated with GBS isolated from pregnant women.Methods: A total of 43 GBS isolates were obtained from 420 vaginal samples collected from HIV positive and negative women who were 13-35 weeks pregnant attending Antenatal Care at Chitungwiza and Harare Central Hospitals in Zimbabwe. Identification tests of GBS isolates was done using standard bacteriological methods and molecular identification testing. Antibiotic susceptibility testing was done using the modified Kirby-Bauer method and E-test strips. The boiling method was used to extract DNA and Polymerase Chain Reaction (PCR) was used to screen for 13 genes. Data was fed into SPSS 24.0.Results: Nine distinct virulence gene profiles were identified and hly-scpB-bca-rib 37.2% (16/43) was common. The virulence genes identified were namely hly 97.8% (42/43), scpB 90.1% (39/43), bca 86.0% (37/43), rib 69.8% (30/43) and bac 11.6% (5/43). High resistance to tetracycline 97.7% (42/43) was reported followed by 72.1% (31/43) cefazolin, 69.8% (30/43) penicillin G, 58.1% (25/43) ampicillin, 55.8% (24/43) clindamycin, 46.5% (20/43) ceftriaxone, 34.9% (15/43) chloramphenicol, and 30.2% (13/43) for both erythromycin and vancomycin using disk diffusion. Antibiotic resistance genes among the resistant and intermediate-resistant isolates showed high frequencies for tetM 97.6% (41/42) and low frequencies for ermB 34.5% (10/29), ermTR 10.3% (3/29), mefA 3.4% (1/29), tetO 2.4% (1/42) and linB 0% (0/35). The atr housekeeping gene yielded 100% (43/43) positive results, whilst the mobile genetic element IS1548 yielded 9.3% (4/43).Conclusion: The study showed high prevalence of hly, scpB, bca and rib virulence genes in S. agalactiae strains isolated from pregnant women. Tetracycline resistance was predominantly caused by the tetM gene, whilst macrolide resistance was predominantly due to the presence of erm methylase, with the ermB gene being more prevalent. Multi-drug resistance coupled with the recovery of resistant isolates to antimicrobial agents such as penicillins indicates the importance of GBS surveillance and susceptibility tests. It was also observed that in vitro phenotypic resistance is not always accurately predicted by resistance genotypes.

scholarly journals A CLINICAL EVALUATION OF ANTIMICROBIAL ACTIVITY OF GOMUTRA ARKA IN DUSTA VRANA

2020 ◽  
pp. 27-35
Author(s):  
Manish Kumar Singh ◽  
P. Ramesh Bhat ◽  
Sweta Tyagi
Keyword(s):  
Antimicrobial Activity ◽  
Antimicrobial Agents ◽  
Povidone Iodine ◽  
Low Cost ◽  
P Value ◽  
Standard Drug ◽  
Classical Formulation ◽  
Group A ◽  
Group B ◽  
Trial Drug

Vrana chikitsha is very significant in field of Shalya tantra. Healing of Vrana is depends on many factors. Among them growth of microorganism play essential role to slow the process of healing. In Dusta Vrana to improve the healthy granulation and to reduce the colony count of microorganism specific Krimghna dravya is required for that in Shasthi upkrama under Krimighna karma Gomutra Arka is advised. Which has additional property of Lekhana and Ropana. Gomutra Arka is given importance in many oral classical formulation of Ayurveda to treat the Krimi, which is not evaluated for local application on Dusta Vrana yet. Materials and Methods: A simple randomized controlled clinical study where 50 patients were equally divided as group A: Gomutra Arka (trial drug) and Group B: Povidone-iodine (standard drug) for 14 days. Observations and results: The study result revealed that Gomutra Arka proved to be better Antimicrobial agents than povidone-iodine with a highly significant p-value of 0.04 in comparison to 0.68. It was also established in the study that 10mlGomutra Arka proved to be more effective on different microorganisms that are Staphylococcus Aureus, Pseudomonas Aeruginosa, Shigella, Salmonella, E. Coli, and Candida Albicans. Conclusion: The Gomutra Arka acts as an antimicrobial agent due to its property like Katu tikta kashya rasa which are Krimighna in nature by this inhibition of microorganism could happen also due to the Ushna tikshna and Kshara guna gives unfavorable environment for bacterial growth. The presence of constituents like copper, aurum, urea, ammonia further helps in antimicrobial activity. Therefore, Gomutra Arka can be used in regular practice as its available at a low cost, affordable and the study proves its efficiency over the Povidone-iodine controlled group.

Influence of Ethanol With and Without Chlorhexidine on the Bacterial Colonization of the Umbilicus of Newborn Infants

1984 ◽  
Vol 5 (6) ◽  
pp. 275-278 ◽  
Author(s):  
S. Bygdeman ◽  
A Hambraeus ◽  
A. Henningsson ◽  
B. Nyström ◽  
C. Skoglund ◽  
...  
Keyword(s):  
Staphylococcus Epidermidis ◽  
Bacterial Colonization ◽  
Bacterial Species ◽  
Newborn Infants ◽  
The Other ◽  
E Coli ◽  
Ethanol Group ◽  
Group G Streptococci ◽  
The One ◽  
Group B

AbstractThe effect of daily treatments with 70% ethanol and with 0.5% Chlorhexidine in 70% ethanol, respectively, on navel colonization in newborns has been studied in 624 infants in two maternity wards during a four-month period. Staphylococcus aureus, group B and G streptococci, E. coli and anaerobes were significantly less often isolated from newborns whose umbilical cord was treated with Chlorhexidine in ethanol than from those treated with ethanol only. Staphylococcus epidermidis and enterococci, on the other hand, were significantly more often isolated from the chlorhexidine-ethanol than from the ethanol group. More infants without colonization of the umbilicus on their fourth day of life were found in the Chlorhexidine in ethanol than in the ethanol group. The infants in the ethanol group were colonized with significantly more bacterial species than the infants in the other group. Signs of dissemination of group B and group G streptococci between babies were seen more often in the group of infants treated with ethanol than in the one treated with chlorhexidine-ethanol.

Nonsteroidal Anti-inflammatory Drugs and the Treatment of Neonatal Sepsis Due to Group B Streptococci

PEDIATRICS ◽  
1982 ◽  
Vol 70 (3) ◽  
pp. 494-495
Author(s):  
James D. Cherry ◽  
Cynthia T. Barrett
Keyword(s):  
Animal Model ◽  
Antimicrobial Agents ◽  
Model Systems ◽  
Group B Streptococci ◽  
Vascular Volume ◽  
Sepsis Model ◽  
Inflammatory Drugs ◽  
Streptococcal Sepsis ◽  
Anti Inflammatory ◽  
Group B

Although group B streptococci are highly susceptible to penicillin and other antimicrobial agents the mortality in early onset disease approaches 50%. Very little is known about the precise pathophysiology of group B streptococcal sepsis and its attendant hematologic, hemodynamic, and immunologic abnormalities. The cause of death in babies is usually shock that is unresponsive to conventional restoration of vascular volume and pharmacologic pressor agents. The findings reported by Short and colleagues in this issue of Pediatrics1 utilizing the suckling rat model of group B streptococcal sepsis are notable. However, caution is necessary in analyzing the results. A strong plea must be made to discourage haphazard human trials with nonsteroidal anti-inflammatory drugs prior to additional confirmatory studies in the rat group B streptococcal sepsis model, and the performance of similar experiments in larger animal model systems.

scholarly journals High incidence of erythromycin-resistant streptococci in Taiwan.

1997 ◽  
Vol 41 (4) ◽  
pp. 844-846 ◽  
Author(s):  
J J Wu ◽  
K Y Lin ◽  
P R Hsueh ◽  
J W Liu ◽  
H I Pan ◽  
...  
Keyword(s):  
Antimicrobial Agents ◽  
Streptococcal Infections ◽  
Broth Microdilution ◽  
Erythromycin Resistance ◽  
Microdilution Method ◽  
Broth Microdilution Method ◽  
High Incidence ◽  
Group B ◽  
Viridans Group Streptococci

The activities of nine antimicrobial agents against 247 isolates of group B, C, F, and G streptococci and viridans group streptococci were studied by the broth microdilution method. Erythromycin resistance was found in 29.7, 41.7, 81.8, 23.5, and 53.3% of the strains of group B, C, F, and G streptococci and viridans group streptococci tested, respectively. Macrolides are not considered an optimal alternative to penicillin in the treatment of streptococcal infections, at least empirically, in Taiwan.

scholarly journals Spontaneous Bacterial Peritonitis: Analysis of Treatment and Outcome

1991 ◽  
Vol 2 (4) ◽  
pp. 147-154 ◽  
Author(s):  
Gary H Victor ◽  
Steven M Opal
Keyword(s):  
Mortality Rate ◽  
Spontaneous Bacterial Peritonitis ◽  
Group B Streptococci ◽  
Bacterial Peritonitis ◽  
Group G Streptococci ◽  
Leukocyte Counts ◽  
Gram Negative Organisms ◽  
Group B ◽  
Culture Positive ◽  
New Strategies

Spontaneous bacterial peritonitis occurred on 44 separate occasions in 43 patients during a five year period, including 27 culture positive and 17 probable cases of spontaneous bacterial peritonitis. Alcoholic liver disease was the underlying cause of 72% of cases. Of the 27 culture positive cases,Escherichia coliwas the most common isolate (14 cases), followed byKlebsiella pneumoniae(three cases), group G streptococci (three cases), group B streptococci (two cases) and one case each of five other organisms. Bacteremia occurred in 50% of cases and was the same as the peritoneal isolate 88% of the time. The overall mortality rate was 65% (66% culture positive and 60% probable spontaneous bacterial peritonitis). The mean interval between onset of symptoms and death was 10.2±8.6 days in fatal cases. Spontaneous bacterial peritonitis was felt to be a contributing cause of mortality in 70% of fatal cases. Survivors were younger (44±20 years versus 59±13, P<0.05) and less likely to develop renal insufficiency than nonsurvivors (38% versus 73%, P<0.05). Patients who were treated with an aminoglycoside were more likely to develop renal failure compared to those treated with nonaminoglycoside regimens (P<0.05). There was no difference in mortality rate between culture positive and culture negative spontaneous bacterial peritonitis, total peritoneal leukocyte counts, Gram-positive versus Gram-negative organisms, presence of bacteremia, or serum albumin or bilirubin levels. The mortality rate for this disease remains unacceptably high, indicating a need for the development of new strategies in the prevention, diagnosis and management of this disease.

scholarly journals Cytotoxic Activity of Some Azole Derivatives

2018 ◽  
Vol 3 (3) ◽  
pp. 79-82
Author(s):  
Zeinab Faghih ◽  
Zahra Rezaei ◽  
Akram Jamshidzade ◽  
Aboozar Keshavarz ◽  
Soghra Khabnadideh
Keyword(s):  
Anticancer Agents ◽  
Antimicrobial Agents ◽  
Human Cancer ◽  
Biological Activities ◽  
Cancer Cell Line ◽  
Cytotoxic Activities ◽  
Group A ◽  
Group B ◽  
2D And 3D ◽  
Group D

Azole derivatives are an important class of compounds in medicinal chemistry with a wide variety of biological activities. We previously described synthesis and antimicrobial evaluations of some new Azole derivatives. Most of our compounds showed desirable activity against different species of microorganisms. Here, we chose seventeen of these compounds, in four different groups including imidazole (group a, 1a-6a), 2-methylimidazole (group b, 1b-4b), 2-methyl-4-nitroimidazole (group c, 1c-4c) and benzimidazole (group d, 1d-3d) to further evaluate their cytotoxic activities against a human cancer cell line (HepG2) in comparison to cisplatin using colorimetric MTT cytotoxic assay. We also compared their cytotoxic activities with clotrimazole to find the safer compounds as antimicrobial agents. Our results indicated that Azole compounds including 2b, 4c, 2d and 3d displayed desirable anti-tumor activities against HepG2 (IC50<50μM) and might be considered as potential anticancer agents for further studies. The o her compounds with less cytotoxicity compared to clotrimazole could introduce as good candidates for antimicrobial agents.

Sign in / Sign up

Export Citation Format

Share Document