Documentation of vancomycin-resistant Staphylococcus aureus (VRSA) among children with atopic dermatitis in the Qassim region, Saudi Arabia.

Sept 2012

Alzolibani AA, Al Robaee AA, Al Shobaili HA, Bilal JA, Issa Ahmad M, Bin Saif G.

Source

Department of Dermatology, College of Medicine, Qassim University, Buraydah 51477, Saudi Arabia. azolibani@yahoo.com.

Abstract

INTRODUCTION:

Staphylococcus aureus is known as a common pathogen in atopic dermatitis. A methicillin-resistant S. aureus strain with reduced susceptibility to vancomycin (VISA/VRSA) is increasing worldwide. The aims of this study were to evaluate the antibiotic-susceptibility pattern of S. aureus isolated from children with atopic dermatitis and to identify the occurrence of resistance to glycopeptide antibiotics.

METHODS:

Swabs were collected from atopic dermatitis skin lesions of 80 children being treated at dermatology clinics whose ages ranged from 6 months to 15 years in the period from March 2009 to February 2010. Isolates were studied with an antibiogram for an antibiotic-susceptibility test. The selected antibiotics were the usually administered antimicrobials at dermatological clinics in Buraydah (Qassim, Saudi Arabia). Results were determined as minimal inhibitory concentration (MIC) using the Vitek system.

RESULTS:

Thirty S. aureus isolates showed resistance to streptomycin (100%), benzylpenicillin and ampicillin (96.7%), and oxacillin (90%). S. aureus resistance to trimethoprim/sulfamethoxazole, tigecycline, and vancomycin was 63.3%, 83.3%, and 53.3%, respectively. Resistance to linezolid was less, at 5.7%.

CONCLUSIONS:

Strains of MRSA with decreasing susceptibility to vancomycin were documented in the Qassim region of Saudi Arabia. Other studies will be required on VISA/VRSA strains concerning phenotypic and genotypic characterization.

PubMed

Antibiotic Usage and its Sensitivity Pattern in the NICU.

Apr 2012

Shrestha R, Shrestha JM, Gurung B.

Source

Department of Pharmacology, Kathmandu University School of Medical Sciences, Nepal.

Abstract

Background: Sepsis is a major cause of mortality and morbidity in newborns affecting both developed and developing countries accounting a quarter around one million deaths per annum. 

Objective:  This study was aimed to assess the prevalence of neonatal sepsis, culture isolates, pattern, antibiotic sensitivity and drug prescribing pattern. Methods In present prospective study, 48 neonates admitted in pediatric ward from January to March 2011 of Dhulikhel Hospital were included. The gestation age, onset of sepsis, culture isolates, antibiotic sensitivity pattern and drug prescribing pattern were studied. Environmental air sampling of NICU (Neonatal Intensive Care Unit) was done by settle plate method for microbial examination. 

Result:  Among 48 neonates, 23 (47.92%) neonates were culture positive with predominant isolates of Klebsiella oxytoca 11(47.83%), Pseudomonas sp. 4(17.39%), Methicillin Resistant Staphylococcus Aureus (MRSA) 3(13.04%) and single case of Enterobacter spp. In environmental samples, K. oxytoca and Enterobacter sp. were isolated. Amikacin, Imepeneum and Ciprofloxacin were sensitive whereas Ampicillin in combination with Cloxacillin, Ampicillin, Aztreonam were resistant for Klebsiella. oxytoca. Amikacin, Ceftazidime and Imipenuem were sensitive to Enterobacter spp. The single or combinations of resistant antibiotics were found to be prescribed. 

Conclusion: The emerging antibiotic resistances among the culture isolates and coherence with environmental samples were observed. Hence, special measures are imperative for reducing environmental contamination and the rational usage of antibiotics for preventing the infection and emerging antibiotic resistance. The study recommends need of the antibiotic policy to curb the present scenario.

PubMed

Rational antibiotic therapy and the position of ampicillin/sulbactam.

Rational antibiotic therapy and the position of ampicillin/sulbactam.
Int J Antimicrob Agents. 2008 Jun

Lode HM.
Research Centre for Medical Studies, Institute of Clinical Pharmacology, Charité Universitätsmedizin Berlin, Hohenzollerndamm 2, D-10717 Berlin, Germany.

In the current context of increasing antimicrobial resistance, it is important to use antibiotics rationally and to re-assess regularly the clinical usefulness of commonly used agents. This review focuses on the efficacy of the beta-lactam ampicillin co-administered with the beta-lactamase inhibitor sulbactam, either parenterally (ampicillin/sulbactam) or orally (sultamicillin), for the treatment of bacterial infections. Clinical findings from the past decade confirm the results of numerous older studies and together provide good evidence to support the continued use of ampicillin/sulbactam and sultamicillin in hospital- and community-acquired infections both in adults and children.

This is also recognised in recent published national and international guidelines, many of which recommend ampicillin/sulbactam as first-line therapy for various respiratory and skin infections.

PubMed

Emergence of Tetracycline-Resistant Vibrio cholerae O1 Serotype Inaba, in Kolkata, India.

Emergence of Tetracycline-Resistant Vibrio cholerae O1 Serotype Inaba, in Kolkata, India.

Jpn J Infect Dis. 2008 Mar

Roychowdhury A, Pan A, Dutta D, Mukhopadhyay AK, Ramamurthy T, Nandy RK, Bhattacharya SK, Bhattacharya MK.
National Institute of Cholera and Enteric Diseases, Kolkata, India. mkbidh@gmail.com.

Out of 2,235 diarrheal stool samples collected from patients admitted to the Infectious Diseases Hospital, Kolkata, 343 cases were positive for Vibrio cholerae (341, V. cholerae O1 and 2, O139). During the year 2004, infections caused by V. cholerae serotype Ogawa and Inaba were 93 and 7%, respectively, while in 2005, the Inaba isolation rate rose to 88% as compared to 12% for Ogawa. Susceptibility to antimicrobial agents revealed that the O1 strains were resistant to multiple antibiotics (ampicillin, co-trimoxazole, furazolidone, nalidixic acid and streptomycin) with reduced susceptibility to ciprofloxacin. Increased isolation of tetracycline-resistant strains (27.3% for Ogawa and 15% for Inaba) was noted in 2005. It appears that the population might be at risk of infection by the Inaba serotype and that tetracycline may not be useful for the treatment.

Japanese Journal of Infectious Disease

Emergence of Vibrio cholerae O1 biotype El Tor serotype Inaba causing outbreaks of cholera in Orissa, India.

Jpn J Infect Dis. 2006 Aug

Pal BB, Khuntia HK, Samal SK, Das SS, Chhotray GP.
Pathology and Microbiology Division, Regional Medical Research Centre, Orissa, India.

A total of 431 rectal swabs, collected from acute diarrheal cases at a surveillance site and at different diarrheal outbreak areas of Orissa from May to October 2005, were bacteriologically analyzed. Out of 265 culture-positive samples, Vibrio cholerae O1 was isolated in 56 samples (20.8%), of which 37 were the Inaba serotype and 19 were the Ogawa. The antibiogram profile revealed that all the V. cholerae O1 Ogawa and Inaba serotypes were uniformly sensitive to ampicillin, chloramphenicol, gentamicin, ciprofloxacin, norfloxacin and tetracycline. The V. cholerae O1 Inaba serotypes were resistant to furazolidone and nalidixic acid, while the Ogawa strains were resistant to furazolidone, nalidixic acid and neomycin. The multiplex polymerase chain reaction (PCR) assay on some selected strains of both serotypes revealed that all the strains were positive for ctxA and tcpA genes showing biotype El Tor. The present study revealed the emergence of V. cholerae O1 biotype El Tor serotype Inaba, which caused sporadic outbreaks of cholera in 2005. The outbreaks of diarrheal disorders in one geographical area of the state (in the Pattamundai area, Kendrapara district) in 2005 were due to V. cholerae O1 Ogawa, whereas the other outbreaks in other areas (Puri, Khurda and Dhenkanal districts) from August to October 2005 were due to V. cholerae O1 serotype Inaba. This is the first report that an emergence of V. cholerae O1 serotype Inaba caused sporadic outbreaks of cholera in different parts of Orissa. Switching over of V. cholerae O1 Ogawa strains to Inaba, causing diarrheal outbreaks in Orissa, needs close monitoring.

Japanese Journal of Infectious Disease

Comparative activities of antibiotics against intracellular non-typeable Haemophilus influenzae.

Comparative activities of antibiotics against intracellular non-typeable Haemophilus influenzae.
Wien Klin Wochenschr. 2007 Jun

Kratzer C, Graninger W, Macfelda K, Buxbaum A, Georgopoulos A.
Department of Internal Medicine I, Division of Infectious Diseases and Tropical Diseases, Medical University of Vienna, Vienna, Austria, apostolos.georgopoulos@meduniwien.ac.at.

INTRODUCTION: Non-typeable Haemophilus influenzae (NTHi) is a major bacterial pathogen of community-acquired respiratory tract infection and is usually found extracellularly, although studies have revealed that NTHi may possess the ability to invade human epithelial cells where it is then protected against attack by the local immune system and partly against the effect of antibiotics. The aim of the present study was to assess the ability of ampicillin, azithromycin, telithromycin, ciprofloxacin and moxifloxacin, five antibiotics in common clinical use, to kill NTHi within bronchial epithelial cells.

METHODS: Confluent human bronchial epithelial cells were infected with NTHi 77, a particularly invasive clinical strain. Extracellular bacterial cells were killed with gentamicin and the intracellular bacteria were incubated with antibiotics at concentrations of 1 mg/l or 10 mg/l for 4 h or 8 h. Viable intracellular bacteria were counted after lysis of the epithelial cells.

RESULTS: With the exception of ampicillin, all the antibiotics caused significant reduction of intracellular bacteria at concentrations of 10 mg/l and exposure for 4 h or at 1 mg/l for 8 h. At 1 mg/l, moxifloxacin eliminated 94% of intracellular NTHi after 4 h and 98% after 8 h; ciprofloxacin, azithromycin and telithromycin only achieved killing indices below 75 after 4 h but 86-90% killing after 8 h. At 10 mg/l, moxifloxacin, ciprofloxacin, telithromycin and azithromycin were able to achieve 99.7%, 96.3%, 86.7% and 74.7% eradication of intracellular bacteria, respectively, after exposure for 4 h.

CONCLUSION: These results demonstrate the rapid antibacterial efficacy of moxifloxacin against intracellular NTHi in vitro. Moxifloxacin, which combines high extracellular and intracellular activities, could be an important tool in the treatment of recurrent respiratory tract infections.

PMID: 17571234 [PubMed - as supplied by publisher]