Comparative effect of ciprofloxacin and moxifloxacin on the modulation of bile acid profiles and gut microbiota in rats

Abstract Fluoroquinolones are an important class of antimicrobial agents to manage infectious diseases. However, knowledge about how host bile acids are modified by fluoroquinolones is limited. We investigated and compared the impact of fluoroquinolones on circulating bile acid profiles and gut microbiota from in vivo studies. We administered ciprofloxacin (100 mg/kg/day) or moxifloxacin (40 mg/kg/day) orally to male Wistar rats for seven days. Fifteen bile acids (BAs) from the serum and large intestine were quantified by HPLC-MS/MS. The diversity of gut microbiota after ciprofloxacin and moxifloxacin treatment was analyzed using high-throughput, next-generation sequencing technology. The two fluoroquinolone-treated groups had different BA profiles. Ciprofloxacin significantly reduced the hydrophobicity index of the BA pool, reduced secondary BAs, and increased taurine-conjugated primary BAs in both the serum and large intestine as compared with moxifloxacin. Besides, ciprofloxacin treatment altered intestinal microbiota with a remarkable increase in Firmicutes to Bacteroidetes ratio, while moxifloxacin exerted no effect. What we found suggests that different fluoroquinolones have a distinct effect on the host BAs metabolism and intestinal bacteria, and therefore provide guidance on the selection of fluoroquinolones to treat infectious diseases.

Informe diário de evidências COVID-19: busca realizada em 19 de junho de 2020 / COVID-19 daily evidence report: search conducted on June 19, 2020

O Informe Diário de Evidências é uma produção do Ministério da Saúde que tem como objetivo acompanhar diariamente as publicações científicas sobre tratamento farmacológico e vacinas para a COVID-19. Dessa forma, são realizadas buscas estruturadas em bases de dados biomédicas, referente ao dia anterior desse informe. Não são incluídos estudos pré-clínicos (in vitro, in vivo, in silico). A frequência dos estudos é demonstrada de acordo com a sua classificação metodológica (revisões sistemáticas, ensaios clínicos randomizados, coortes, entre outros). Para cada estudo é apresentado um resumo com avaliação da qualidade metodológica. Essa avaliação tem por finalidade identificar o grau de certeza/confiança ou o risco de viés de cada estudo. Para tal, são utilizadas ferramentas já validadas e consagradas na literatura científica, na área de saúde baseada em evidências. Cabe ressaltar que o documento tem caráter informativo e não representa uma recomendação oficial do Ministério da Saúde sobre a temática. Foram encontrados 9 artigos e 6 protocolos.

Effects of topical azithromycin, moxifloxacin, and povidone iodine on conjunctival bacterial flora in patients undergoing intravitreal injection / Os efeitos da azitromicina tópica, moxifloxacina e iodopovidona na flora bacteriana conjuntival em injeções intravítreas

ABSTRACT Purpose: To compare effects of 5% topical povidone iodine with prophylactic topical azithromycin and moxifloxacin on bacterial flora in patients undergoing intravitreal injection. Methods: A total of 132 patients were randomly assigned to receive treatment with azithromycin or moxifloxacin, or no treatment (control group). In total, 528 specimens were obtained at the time of admission, 4 days before intravitreal injection, 4 days after intravitreal injection, and 8 days after intravitreal injection. Samples were immediately sent to the microbiology laboratory for incubation. Results: The microorganism observed most frequently was coagulasenegative Staphylococcus (23.8%). When the results of samples obtained on Day 4 before injection were assessed, growth of coagulase-negative Staphylococcus was significantly lower in the moxifloxacin group, compared with controls (p=0.049). Acinetobacter baumannii continued to grow after administration of azithromycin (p=0.033). When the results of four days after intravitreal injection were evaluated, growth of coagulase-ne gative Staphylococcus was higher in controls, compared with patients who received azithromycin or moxifloxacin (p=0.004). Eradication rate was significantly higher in the moxifloxacin group than in the control group (p=0.001). Samples obtained on Day 8 after intravitreal injection showed similar levels of bacterial growth in all groups (p=0.217). Conclusion: Moxifloxacin was more effective than 5% povidone iodine in controlling the growth of conjunctival bacterial flora. Use of moxifloxacin in combination with 5% povidone iodine resulted in a synergistic effect.

RESUMO Objetivo: Comparar os efeitos de iodopovidona tópico a 5% com azitromicina e moxifloxacina profiláticas sobre a flora bacteriana em pacientes submetidos à injeção intravítrea. Métodos: Um total de 132 pacientes foram aleatoriamente designados para receber tratamento com azitromicina ou moxifloxacina ou nenhum tratamento (grupo controle). No total, 528 amostras foram obtidas no momento na admissão, 4 dias antes da injeção intravítrea, 4 dias após a injeção intravítrea e 8 dias após a injeção intravítrea. As amostras foram imediatamente enviadas para o laboratório de microbiologia para incubação. Resultados: O microorganismo mais frequentemente observado foi o Staphylococcus coagulase-negativo (23,8%). Quando os resultados das amostras obtidas no dia 4 antes da injeção foram avaliados, o crescimento do Staphylococcus coagulase-negativo foi significativamente menor no grupo mo xifloxacina, em comparação com os controles (p=0,049). Acinetobacter baumannii continuou a crescer após a administração de azitromicina (p=0,033). Quando os resultados de 4 dias após a injeção intravítrea foram avaliados, o crescimento do Staphylococcus coagulase-negativo foi maior no controle, em comparação com pacientes que receberam azitromicina ou moxifloxacina (p=0,004). A taxa de erradicação também foi significativamente maior no grupo moxifloxacina do que no grupo controle (p=0,001). As amostras obtidas no dia 8 após injeção intravítrea mostraram níveis semelhantes de crescimento bacteriano em todos os grupos (p=0,217). Conclusão: A moxifloxacina foi mais eficaz do que 5% de iodopovidona no controle do crescimento da flora bacteriana conjuntival. O uso de moxifloxacina em combinação com 5% de iodopovidona resultou em um efeito sinérgico.

Ocular delivery of moxifloxacin-loaded liposomes / Perfil de liberação ocular de lipossomas contendo moxifloxacino

ABSTRACT Purpose: To determine the release profile of moxifloxacin encapsulated in liposomes in the aqueous humor as a controlled release system for intracameral application. Methods: Liposomes containing moxifloxacin were obtained using the lipid film hydration method and were characterized by particle size and encapsulation efficiency. Female rabbits were used for the in vivo profile release study. Liposomes containing moxifloxacin was injected into the anterior chamber of the right eye of each animal. The rabbits were divided into five groups, and a sample of aqueous humor was collected 2, 4, 8, 24, and 48 h after administration of liposomes containing moxifloxacin administration. Moxifloxacin concentrations in the aqueous humor were analyzed using high-performance liquid chromatography. Results: The average size of the liposomes containing moxifloxacin was 60.5 ± 0.72 nm with a particle size distribution of 0.307. The encapsulation efficiency of moxifloxacin in liposomes was 92.24 ± 0.24%. The results of an in vivo release study of liposomes containing moxifloxacin, showed that the maximum moxifloxacin concentration was achieved within the first 2 h after administration (5.27 ± 1.09 mg/mL) and was followed by a decrease in intracameral concentration (0.35 ± 0.05 mg/mL) until the 24 h mark. Conclusions: The in vivo experiments resulted in liposomes containing moxifloxacin that were homogenous in size and exhibited high drug encapsulation efficiency. The results indicate that liposomes containing moxifloxacin offers a satisfactory aqueous humor release profile after intracameral application.

RESUMO Objetivo: Determinar o perfil de liberação, no humor aquoso, de moxifloxacino encapsulado em lipossomas como um sistema de liberação controlada para aplicação intracameral. Métodos: Lipossomas contendo moxifloxacino foram obtidos através do método de hidratação do filme lipídico e caracterizados por tamanho da partícula e eficiência de encapsulação. Utilizaram-se coelhos fêmeas foram para o estudo do perfil de liberação in vivo. Lipossomas contendo moxifloxacino foram injetados na câmara anterior do olho direito de cada animal. Os coelhos foram divididos em cinco grupos, e uma amostra de humor aquoso foi coletada 2, 4, 8, 24 e 48 h após a administração de lipossomas contendo moxifloxacino. As concentrações de moxifloxacino no humor aquoso foram analisadas usando cromatografia líquida de alta eficiência. Resultados: O tamanho médio dos lipossomas contendo moxifloxacino foi de 60,5 ± 0,72 nm com uma distribuição de tamanho de partícula de 0,307. A eficiência de encapsulação de moxifloxacino nos lipossomas foi de 92,24 ± 0,24. Os resultados de um estudo de liberação in vivo de lipossomas contendo moxifloxacino, mostraram que a concentração máxima de moxifloxacino foi atingida dentro das primeiras 2 h após sua administração (5,27 ± 1,09 mg/mL) e foi seguida de um decréscimo na concentração intracameral (0,35 ± 0,05 mg/mL) até a marca de 24 h. Conclusão: Os experimentos in vivo resultaram em lipossomas contendo moxifloxacino que eram homogêneos em tamanho e exibiam alta eficiência de encapsulação do fármaco. Os resultados indicam que lipossomas contendo moxifloxacino oferecem um perfil de liberação de humor aquoso satisfatório após a aplicação intracameral.

Role of moxifloxacin-dexamethasone in cardiac histomorphometric findings among Wistar rats from infected mothers

Abstract Purpose: To investigate cardiac changes in young rats, whose mothers underwent autogenic fecal peritonitis, during organogenesis phase and to evaluate the role of intravenous administration of moxifloxacin and dexamethasone in preventing infection-related cardiac changes. Methods: A prospective histomorphometric study was performed on 29 hearts of Wistar four-month old rats. Animals were divided into three groups: Negative Control Group (NCG) included 9 subjects from healthy mothers; Positive Control Group (PCG) included 10 subjects from mothers with fecal peritonitis (intra-abdominal injection of 10% autogenic fecal suspension in the gestational period) and did not receive any treatment; and Intervention Group (IG), with 10 animals whose infected mothers received moxifloxacin and dexamethasone treatment 24 hours after induction of fecal peritonitis. Results: Nuclear count was higher in the IG group as compared to PCG (p = 0.0016) and in NCG as compared to PCG (p = 0.0380). There was no significant difference in nuclear counts between NCG and IG. Conclusion: Induced autogenic fecal peritonitis in pregnant Wistar rats determined myocardial changes in young rats that could be avoided by the early administration of intravenous moxifloxacin and dexamethasone.

Intracameral moxifloxacin after cataract surgery: a prospective study / Moxifloxacino intracameral após cirurgia da catarata: estudo prospectivo

ABSTRACT Objective: To study the safety parameters associated with intracameral moxifloxacin application five weeks after cataract surgery. Methods: The study was a prospective case series set in a private hospital in Recife, Pernambuco, Brazil. A consecutive sample of 1,016 cataract surgeries was evaluated. The inclusion criteria were patients with indications for cataract surgery, a minimum of 55 years of age, and no history of allergy to quinolones. Patients were prepared for surgery using a 5% povidone solution diluted as a topical antiseptic agent. The operative technique was phacoemulsification with intraocular lens implantation. A 0.3-mL syringe was partially filled with moxifloxacin and 150 µg/0.03 mL of moxifloxacin was administered through the surgical incision at the end of the surgery. Postoperatively, patients were prescribed: (1) 0.5% moxifloxacin eyedrops 5 times daily for 1 week, and (2) 1% prednisolone acetate eyedrops 5 times daily for 1 week, followed by 4 times daily for 1 week and, subsequently, 2 times daily for 3 weeks. The outcomes were incidence of acute endophthalmitis, mean changes from baseline to 5 postoperative weeks in corneal endothelial cell density, corrected distance visual acuity and intraocular pressure. Results: The mean age was 67 ± 5 years, and 56.2% of the patients were female. There were no cases of endophthalmitis. The mean preoperative corrected distance visual acuity was 58 letters ± 10 (SD), and the mean postoperative corrected distance visual acuity was 80 letters ± 4 (SD). The mean change in corneal endothelial cell density was 249 cells/mm (-10.3%). There was almost no difference in intraocular pressure. No study-related adverse events were observed. Conclusion: The results suggest moxifloxacin is a safe option for intracameral use after cataract surgery.

RESUMO Objetivo: Estudar alguns parâmetros de segurança da moxifloxacino intracameral nas cinco semanas após a cirurgia de catarata. Métodos: O estudo foi uma série de casos prospectivos. O cenário era um hospital privado em Recife, Pernambuco, Brasil. Foi considerada uma amostra consecutiva de 1.016 cirurgias de catarata. Os critérios de inclusão foram pacientes com indicação para cirurgia de catarata, com pelo menos 55 anos de idade e sem história de alergia a quinolonas. Os pacientes foram preparados para cirurgia usando uma solução de povidona a 5% diluída como agente anti-séptico tópico. A técnica operatória foi a facoemulsificação com implante de lente intraocular. Uma seringa de 0,3 mL foi parcialmente preenchida com moxifloxacino. Os pacientes receberam 150 µg/0,03 mL de moxifloxacino através da incisão cirúrgica no final da cirurgia. No pós-operatório, os pacientes foram prescritos: (1) moxifloxacino 0,5% 5 vezes ao dia durante 1 semana e (2) colírio de acetato de prednisolona a 1% 5 vezes ao dia durante 1 semana, seguido de 4 vezes ao dia durante 1 semana e, posteriormente, 2 vezes diariamente por 3 semanas. Os desfechos foram a incidência de endoftalmite aguda, variações entre os valores basais e os na 5ª semana pós-operatória referente à densidade celular endotelial corneana, acuidade visual corrigida para longe e pressão intraocular. Resultados: A média da idade foi de 67 ± 5 anos, e 56,2% dos pacientes eram do sexo feminino. Não houve casos de endoftalmite. A acuidade visual corrigida para longe préoperatório médio foi de 58 letras ± 10 (SD), e a acuidade visual corrigida para longe pósoperatório médio foi de 80 letras ± 4 (SD). A alteração média na densidade celular endotelial corneana foi de 249 células/mm (10,3%). Não houve diferença na pressão intraocular. Não foram observados eventos adversos relacionados ao estudo. Conclusão: Os resultados sugerem que o moxifloxacino é uma opção segura para o uso intracameral após a cirurgia de catarata.

Secondary glaucoma induced by bilateral acute depigmentation of the iris / Glaucoma secundário à despigmentação bilateral aguda da íris

Abstract We report a case of a middle-aged woman who developed acute, bilateral, symmetrical, slightly transilluminating depigmentation of the iris and pigment discharge into the anterior chamber following the use of oral moxifloxacin for bacterial sinusitis. She had been misdiagnosed as having autoimmune uveitis, treated with steroids and tropicamide, and underwent severe ocular hypertension and glaucoma despite posterior correct diagnosis.

Resumo Relato de um caso de uma paciente do sexo feminino de meia idade que desenvolveu despigmentação bilateral simultânea aguda com dispersão de pigmentos na câmara anterior e discreta transiluminação após o uso de moxifloxacino oral para tratamento de sinusite bacteriana. Ela Havia sido diagnosticada com uveite autoimune e tratada com corticosteroide tópico e tropicamida e evoluiu com hipertensão ocular grave e glaucoma apesar de ,posteriormente, o diagnóstico ter sido correto.

Aqueous humor concentrations of topical fluoroquinolones alone or in combination with a steroid / Concentração de fluorquinolonas no humor aquoso após instilação tópica das associações com corticosteroides

ABSTRACT Purpose: To compare the aqueous humor (AH) concentrations of moxifloxacin 0.5% and gatifloxacin 0.3% solutions alone or when treatment was combined with steroids, and to correlate these concentrations with the minimum inhibitory concentrations (MIC) for the most common endophthalmitis-causing organisms. Methods: Patients undergoing phacoemulsification were enrolled to receive one drop of one of the following solutions: moxifloxacin (G1), moxifloxacin + dexamethasone (G2), gatifloxacin (G3), or gatifloxacin + c (G4), every 15 min, 1h before surgery. AH samples were collected before surgery and analyzed using HPLC-tandem mass spectrometry. Results: The mean antibiotic concentrations in the AH were: G1= 1280.8 ng/mL; G2= 1644.3 ng/mL; G3= 433.7 ng/mL; and G4= 308.1 ng/mL. The mean concentrations statistically differed between G1 and G2 (p=0.01), and G3 and G4 (p=0.008). All samples achieved the MIC for Staphylococcus epidermidis; 100% of the samples from G1 and G2, and 97% from G3 and G4 reached the MIC for fluoroquinolone-sensitive Staphylococcus aureus; 100% of the samples from G1 and G2, 88% from G3, and 72% from G4 reached the MIC for enterococci (p<0.001); and 100% of samples from G1 and G2, 59% from G3, and 36% from G4 reached the MIC for Streptococcus pneumoniae (p<0.001). For fluoroquinolone-resistant S. aureus, 23% from G1, 44% from G2, and no samples from G3 or G4 achieved the MIC (p<0.001). Conclusions: Moxifloxacin + dexamethasone demonstrated a higher concen­tration in the AH than the moxifloxacin alone. Gatifloxacin + steroids demonstrated less penetration into the anterior chamber than gatifloxacin alone. Moxifloxacin was superior to gatifloxacin considering the MIC for enterococci, S. pneumoniae, and fluoroquinolone-resistant S. aureus.

RESUMO Objetivos: Comparar a concentração no humor aquoso entre as soluções de moxifloxacina 0,5% e gatifloxacina 0,3% sozinhas ou combinadas com corticosteroides, e correlacionar a concentração com a concentração inibitória mínima (MIC) para os agentes microbianos mais comumente relacionados a endoftalmites. Métodos: Pacientes que seriam submetidos a cirurgia de catarata foram selecionados para receber 1 gota a cada 15 min, 1 hora antes do procedimento de uma das seguintes soluções: moxifloxacina (G1), moxifloxacina + dexametasona (G2), gatifloxacina (G3) ou gatifloxacina + prednisolona (G4). Amostras do humor aquoso foram coletadas antes do início da cirurgia. Espectrofotometria de massa por HPLC determinou a concentração do antibiótico nas amostras. Resultados: A concentração media de antibiótico nas amostras foram: G1= 1280,8 ng/mL; G2= 1644,3 ng/mL; G3= 433,7 ng/mL; G4= 308,1 ng/mL. Concentração média entre G1 e 2 (p=0,01), e G3 e 4 (p=0,008). Todas as amostras alcançaram MIC para S. epidermidis; 100% das amostras do G1 e 2, e 97% do G3 e 4 atingiram o MIC para S. aureus fluoroquinolona-sensível; 100% das amostras do G1 e 2, 88% do G3 e 72% do G4 atingiram o MIC para Enterococci (p<0,001); e 100% das amostras do G1 e 2, 59% do G3 e 36% do G4 atingiram o MIC para S. pneumoniae (p<0,001). Para o S. aureus resistente a fluoroquinolona, 23% do G1, 44% do G2, e nenhuma das amostras G3 e 4 atingiram o MIC (p<0,001). Conclusão: Moxifloxacina + dexamethasona demonstrou maior concentração no humor aquoso comparado com a moxifloxacina sozinha. Gatifloxacina + esteróide demonstrou menor penetração na câmara anterior comparado a solução de ga­ti­floxacin sem corticóide. A moxifloxacina foi superior a gatifloxacina considerando o MIC para Enterococci, S. pneumoniae e S. aureus fluorquinolona resistente.

Safety and efficacy of intracameral moxifloxacin injection for prophylaxis of endophthalmitis after phacoemulsification / Segurança e eficácia na injeção intracameral de moxifloxacino para profilaxia da endoftalmite após a facomeulsificação

ABSTRACT Purpose: To evaluate the safety and efficacy of 0.05 mL intracameral injection of moxifloxacin in patients who underwent phacoemulsification and intraocular lens (IOL) implant. Methods: Retrospective study comprising patients who underwent phacoemulsification and IOL implant between January 2009 and December 2013. Patients were divided into two groups. Group A followed standard endophthalmitis prevention protocol and group B followed the same protocol plus intracameral injection of 0.05 mL of moxifloxacin hydrochloride at 5.45 mg/mL, immediately after IOL implant. Results: Medical records from 7,195 eyes of 3,751 patients (median age: 67.8 ± 8.96, range: 48-83 years, 53.8% female) were evaluated. Group A included 3,515 eyes of 1,838 patients and group B included 3,680 eyes of 1,913 patients. The incidence of endophthalmitis in group A was 0.22% (8:3,515 eyes) and in group B was 0.03% (1:3,680 eyes, p=0.0198, Fischer's exact test). No toxicity or inflammation related to the use of moxifloxacin was observed. Conclusions: There was a 7.3-fold lower ratio of endophthalmitis in the group that received moxifloxacin intracameral injection. This study provides further evidence that moxifloxacin is an effective intracameral prophylactic antibiotic.

RESUMO Objetivo: Avaliar a segurança e a eficácia da injeção intracameral de 0,05 mL de moxifloxacina em pacientes que realizaram facoemulsificação e implante de lente intraocular. Métodos: Estudo retrospectivo envolvendo pacientes submetidos a facoemulsificação e implante de lente intraocular entre janeiro de 2009 a dezembro de 2013. Os pacientes foram divididos em dois grupos. O grupo A seguiu o protocolo padrão de prevenção de endoftalmite e o grupo B seguiu o mesmo protocolo associado à injeção intracameral de 0,05 mL de cloridrato de moxifloxacino a 5,45 mg/mL, imediatamente após o implante de lentes intra-oculares (LIO). Resultados: Foram avaliados registros clínicos de 7.195 olhos de 3.751 pacientes (mediana de idade de 67,8 ± 8,96, faixa de 48-83 anos, 53,8% de mulheres). O grupo A incluiu 3.515 olhos de 1.838 pacientes e o grupo B incluiu 3.680 olhos de 1.913 pacientes. A incidência de endoftalmite no grupo A foi de 0,22% (8:3.515 olhos) e no grupo B de 0,03% (1:3.680 olhos, p=0,0198, teste exato de Fischer). Não foi observada toxicidade ou inflamação relacionada com o uso de moxifloxacino intracameral. Conclusões: Houve uma proporção 7,3 vezes menor de endoftalmite no grupo que recebeu injeção de moxifloxacino. Este estudo fornece mais evidências que o moxifloxacino intracameral é um antibiótico profilático intracameral eficaz.

Penetration of 0. 3% ciprofloxacin, 0. 3% ofloxacin, and 0. 5% moxifloxacin into the cornea and aqueous humor of enucleated human eyes

We aimed to quantify the penetration of ciprofloxacin, ofloxacin, and moxifloxacin into the cornea and aqueous humor of cadaver eyes. A total of 60 enucleated eyes, not eligible for corneal transplantation, were divided into three groups and immersed in commercial solutions of 0.3% ciprofloxacin, 0.3% ofloxacin, or 0.5% moxifloxacin for 10 min. Whole corneas and samples of aqueous humor were then harvested and frozen, and drug concentrations analyzed by liquid chromatography tandem mass spectrometry. The mean corneal concentration of moxifloxacin was twice as high as ofloxacin, and the latter was twice as high as ciprofloxacin. The mean concentration of moxifloxacin in the aqueous humor was four times higher than the other antibiotics, and the mean concentrations of ciprofloxacin and ofloxacin were statistically similar. The amount of drug that penetrated the anterior chamber after a 10-min immersion was far below the safe limit of endothelial toxicity of each preparation. Moxifloxacin demonstrated far superior penetration into the cornea and anterior chamber of cadaver eyes compared to ciprofloxacin and ofloxacin. One should not expect endothelial toxicity with the commercial eye drops of ciprofloxacin, ofloxacin, and moxifloxacin that reach the anterior chamber through the cornea.

Antimicrobial susceptibility of Brazilian Clostridium difficile strains determined by agar dilution and disk diffusion

Abstract Clostridium difficile is a leading cause of diarrhea in hospitalized patients worldwide. While metronidazole and vancomycin are the most prescribed antibiotics for the treatment of this infection, teicoplanin, tigecycline and nitazoxanide are alternatives drugs. Knowledge on the antibiotic susceptibility profiles is a basic step to differentiate recurrence from treatment failure due to antimicrobial resistance. Because C. difficile antimicrobial susceptibility is largely unknown in Brazil, we aimed to determine the profile of C. difficile strains cultivated from stool samples of inpatients with diarrhea and a positive toxin A/B test using both agar dilution and disk diffusion methods. All 50 strains tested were sensitive to metronidazole according to CLSI and EUCAST breakpoints with an MIC90 value of 2 μg/mL. Nitazoxanide and tigecycline were highly active in vitro against these strains with an MIC90 value of 0.125 μg/mL for both antimicrobials. The MIC90 were 4 μg/mL and 2 μg/mL for vancomycin and teicoplanin, respectively. A resistance rate of 8% was observed for moxifloxacin. Disk diffusion can be used as an alternative to screen for moxifloxacin resistance, nitazoxanide, tigecycline and metronidazole susceptibility, but it cannot be used for testing glycopeptides. Our results suggest that C. difficile strains from São Paulo city, Brazil, are susceptible to metronidazole and have low MIC90 values for most of the current therapeutic options available in Brazil.

A case of atypical nocardia asteroides sclerouveitis resistant to fourth-generation fluoroquinolones / Um caso atípico de esclero-uveíte por Nocardia Asteroides resistente a fluorquinolona de quarta-geração

ABSTRACT We describe an unusual case of Nocardia spp scleritis in a health girl resistant to topical fourth-generation fluoroquinolones. Clinically, there was only partial response of the scleritis to initial therapy. Treatment was changed to meropenem intravenously and topical amikacin. Following several weeks of antibiotic treatment, the patient's infection resolved but her vision was reduced to no light perception. Nocardia asteroides must be considered as a possible agent in cases of necrotizing scleritis in patients without a clear source. Antibiotic sensitivity testing has a definitive role in view of the resistance to these new medications.

RESUMO Nós descrevemos um raro caso de esclerite por Nocardia spp em uma criança sadia resistente a utilização tópica de fluorquinolona de quarta-geração. Clinicamente, a paciente apresentou apenas uma resposta parcial do quadro de esclerite a terapêutica inicial. O tratamento foi então modificado para meropenem intravenoso e amicacina tópica. Após várias semanas de tratamento com antibiótico, o quadro infeccioso regrediu porém a visao da pacientes evoluiu para perda da percepção luminosa. Em casos de esclerite necrotizante em pacientes sem fatores de risco aparente é necessário considerer a Nocardia Asteroides como possível agente causador. Os testes de sensibilidade medicamentosa apresentam importância significativa em virtude do aparecimento de resistência aos novos medicamentos.

Úlcera de córnea por Pseudomonas stutzeri / Pseudomonas stutzeri corneal ulcer

Este relato aborda um caso atípico de úlcera de córnea em uma criança de 09 anos, causado pela bactéria Pseudomonas stutzeri, um micro-organismo oportunista cujo isolamento em olhos é extremamente raro.

This report discusses an unusual case of corneal ulcer in a child of 09 years old, caused by the bacteria Pseudomonas stutzeri, an opportunistic organism whose isolation in the eyes is extremely rare.