Sífilis adquirida: uma revisão epidemiológica dos casos em adultos e idosos no município de Porto Alegre/RS

Background and Objectives: It is known that acquired syphilis, in the “gaúcho” epidemiological scenario, is a disease of extreme importance due to its high prevalence and rise. From this, the following work aims to review the measures used in the care of adult and elderly patients diagnosed with acquired syphilis and its epidemiology in the city of Porto Alegre / RS. Contents: According to data published in 2016 by the Ministry of Health, the growth of syphilis infection in adults and elderly individuals is in great expansion in Brazil. Through the achievements of the elderly in the last decades, the prolongation of sexual life is a point worth highlighting, besides the incentive to socialization and the lack of information on sexual health. Conclusion: Sexually transmitted infections grow in these two publics and more effective preventive measures in the field of public health are needed. Keywords: Syphilis. Communicable Diseases. Public Health. Infectious Disease.Justificación y Objetivos: Se sabe que la sífilis adquirida, en el escenario epidemiológico”gaúcho”, se configura como una enfermedad de extrema importancia debido a su alta prevalencia y ascenso. A partir de ello, el siguiente trabajo busca revisar las medidas utilizadas en la asistencia de los pacientes adultos y ancianos con diagnóstico de sífilis adquirida y su epidemiología en la ciudad de Porto Alegre /RS. Contenido: Según datos publicados en 2016 por el Ministerio de Salud, el crecimiento de la infección por sífilis en individuos adultos y ancianos está en gran expansión en Brasil. A través de los logros alcanzados por los ancianos en las últimas décadas, la prolongación de la vida sexual es un punto merecedor de hincapié, además del incentivo a la socialización y la falta de información sobre salud sexual. Conclusiones: Las infecciones sexualmente transmisibles crecen en estos dos públicos y se necesitan medidas preventivas más efectivas en el ámbito de la salud pública. Palabras-clave: Sífilis. Enfermedades transmisibles. Salud pública. Enfermedades infecciosasJustificativa e Objetivos: Sabe-se que a sífilis adquirida, no cenário epidemiológico gaúcho, configura-se como doença de extrema importância devido a sua alta prevalência e ascensão. A partir disso, o seguinte trabalho visa revisar as medidas utilizadas na assistência dos pacientes adultos e idosos com diagnóstico de sífilis adquirida e sua epidemiologia no município de Porto Alegre/RS. Conteúdo: Segundo dados publicados em 2016 pelo Ministério da Saúde, o crescimento da infecção por sífilis em indivíduos adultos e idosos está em grande expansão no Brasil. Através das conquistas pelos idosos nas últimas décadas, o prolongamento da vida sexual é ponto merecedor de destaque, além do incentivo à socialização e a falta de informação sobre saúde sexual. Conclusão: As infecções sexualmente transmissíveis crescem nestes dois públicos e necessita-se medidas preventivas mais efetivas no âmbito da saúde pública. Descritores: Sífilis. Doenças Transmissíveis. Saúde Pública. Doenças infecciosas

The influence of different culture media on Pseudomonas aeruginosa, Escherichia coli, and Staphylococcus aureus biofilm formation

Microorganisms such as Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus are frequently isolated in samples of urinary, blood, intestinal, and respiratory infections, among others. These bacteria are also associated with microbial biofilm formation. E. coli, P. aeruginosa, and S. aureus biofilm infections are particularly hard to manage and often associated with nosocomial problems. This study investigated the influence of different culture media on E. coli, P. aeruginosa, and S. aureus biofilm formation. Bacterial performance was evaluated in brain heart infusion broth, Mueller-Hinton broth, or tryptic soy broth, with or without supplementing with different glucose levels (1-5%). The study quantified biofilm biomass and the count of viable biofilm colonies. This is the first study that compares the biofilm formation of E. coli, P. aeruginosa and S. aureus in polystyrene using different culture media and with different glucose concentrations. The most robust growth of E. coli, P. aeruginosa, and S. aureus occurred in brain heart infusion broth supplemented with 5% glucose, Mueller-Hinton broth without glucose, and tryptic soy broth with 2% glucose, respectively. Our data demonstrate that behavioral and morphological characteristics of each bacterium require a specific broth to enhance the growth of these microorganisms. These findings will contribute to future tests for therapeutic alternatives with anti-biofilm potential

Detection and characterization of Bacillus cereus isolated from the dialysis fluid

In this study, B. cereus was detected in dialysis fluids within international parameters (ultrapure – maximum limit of 0.1 CFU/mL for heterotrophic bacteria count) by analyzing the pellet obtained through the centrifugation method. We also investigated the ability of the B. cereus isolate to form a biofilm at different temperatures, the production of virulence factors, and the susceptibility to commercial antimicrobial agents. This study demonstrated a high ability of B. cereus to persist in the hemodialysis system, which can be explained by its broad ability to produce a biofilm at 25 °C, its relevant production of virulence factors, such as β-hemolysin, lecithinase and cereulide, and its important resistance pattern to antimicrobial drugs. In conclusion, these new findings expand the understanding that this microorganism should not be neglected and new methods for tracking it should be considered

ANTIMICROBIAL PEPTIDE P34 INFLUENCES GENE EXPRESSION OF LISTERIA MONOCYTOGENES GROWING IN SOFT CHEESE

Objective: To evaluate whether antimicrobial substances produced by autochthonous lactic acid bacteria (LAB) from Minas Frescal cheese are able to enhance the activity of bacteriocin P34 against Listeria monocytogenes and investigate the influence of P34 in specific gene expression of this bacterium after the inoculation in Minas Frescal cheese.Methods: Bacillus sp. P34 and L. monocytogenes ATCC 7644 were used in this study. The antimicrobial peptide P34 was purified and applied (0, 800 or 6400 AU/ml) to cheese surface before inoculation with L. monocytogenes. Antimicrobial activity and synergism were detected using the agar diffusion technique. Expression levels of D-Alanine-D-alanyl carrier protein ligase (dltA), Putative phospholipid lysinylation (Imo 1695) and EIIABMan of mannose-specific PTS (mptA) mRNAs in bacteriocin-treated L. monocytogenes growing in Minas Frescal cheese were determined using real-time PCR.Results: The peptide P34 showed increased antilisterial activity when combined with culture supernatants of some selected LAB isolated from Minas Frescal cheese. The addition of peptide P34 to cheese caused a decrease of up to 3 log cycles in viable counts of artificially inoculated L. monocytogenes. The influence of peptide P34 on the expression of genes associated with components of the cell surface of L. monocytogenes was investigated by real-time PCR. A significant increase in the expression of the genes dltA, Imo 1695 and mptA was observed after 96 h in the presence of peptide P34.Conclusion: These results suggest that the peptide P34 influences the expression of genes involved in D-alanylation of teichoic acids and lipoteichoic acids and lysination of the cell membrane of phospholipids

Antibacterial and antibiofilm activity of Physalis peruviana calyx extract / Atividade antibacteriana e antibiofilme do extrato do cálice de Physalis peruviana

This study aimed to evaluate the antibacterial and antibiofilm activity of a P. peruviana calyx extract. Goldenberry calyx extracts were prepared with 60% (v/v) ethanol. Minimum inhibitory concentration (MIC) analyses were performed by the 96-well plate microdilution method together with the minimum bactericidal concentration (MBC). Biofilm inhibition and destruction was performed in microdilution plates. The P. peruviana calyx extract presented antibacterial activity against the pathogens analyzed (Enterobacter aerogenes ATCC 13048, Klebsiella pneumoniae ATCC 1705, Staphylococcus epidermidis (clinical isolate), Streptococcus pneumoniae ATCC 99619, Pseudomonas aeruginosa PA01, Enterococcus faecalis ATCC 29212, Escherichia coli (clinical isolate), Shigella sonnei (clinical isolate), Acinetobacter baumannii ATCC 19606, Streptococcus agalactie (clinical isolate), Acinetobacter baumannii (clinical isolate), Salmonella sp. (clinical isolate), Salmonella enteritidis (clinical isolate), and Staphylococcus aureus (clinical isolate)). MIC varied from 3.15 to 30 mg/mL extract and showed bacteriostatic activity against eight pathogens and bactericidal activity at 30 mg/mL concentration against six strains. Biofilm tests revealed biofilm formation inhibition, although there was no destruction. According to these results, the potential antibacterial activity of P. peruviana calyx extract was verified. This will enable further studies to be carried out to contribute to its use in the food industry as a preservative of natural origin and other clinical applications

Insecticidal Action of Glycerol Monolaurate against the Lesser Mealworm (Alphitobius diaperinus) and its Ecotoxicological Effect on Enchytraeus crypticus

Background: Alphitobius diaperinus, known as the lesser mealworm, is recognized as a problem for the poultry production sector. Several chemical methods have been employed in an attempt to control it, without successful results. Thus, alternative methods should be considered as an interesting approach to control this type of infestation. A recent study showed that glycerol monolaurate (GML) possesses insecticidal effect against bees. Therefore, the aim of this study was to evaluate, for the first time, the effect of GLM against the larval and adult forms of the lesser mealworm in vitro, and to verify whether GLM treated poultry litter used as soil fertilizer exerts any negative effect on its fauna.Materials, Methods & Results: In vitro tests were performed using three concentrations of GLM: 0.2, 0.4 and 1 mg mL-1, and the number of dead larvae and adults of A. diaperinus was counted on days 0, 2, 5 and 8 post-treatment. Poultry litter was pulverized with 1 mg mL-1 of GML, maintained under controlled conditions for 20 days and revolved every two days. Two ecotoxicological tests were performed using Enchytraeus crypticus. In the first test, GML was applied directly into the soil at doses of 0.5, 1 and 2 mg kg-1 of soil, while the second test used poultry litter as soil fertilizer at concentrations of 0, 2, 4 and 8 tons per hectare. Insecticidal action of GML against larvae and adults of A. diaperinus where only the 1 mg mL-1 concentration showed positive effect. GML caused 100% mortality of larvae two days after the beginning of treatment. Similarly, GML showed high efficacy to control adult forms of A. diaperinus, causing 83 and 90% of mortality on days 5 and 8 post-treatment, respectively. No difference was observed while applying GML directly at doses of 0.5, 1 and 2 mg kg-1 in the TAS when compared to the control group, similarly to what was observed using poultry litter containing 1 mg/m2 of GML at concentrations of 0, 2, 4 and 8 tons per hectare compared to the control group.Discussion: GML treatment exerted larvicidal and insecticidal action in vitro against A. diaperinus, similarly to what was observed by researchers against bees, where this product was able to eliminate 55% of the bees after 120 h of treatment. GML insecticidal mechanism of action is poorly investigated and remains unknown. However, there are evidences regarding its antimicrobial property using Staphylococcus aureus, Streptococcus spp., Enterococcus faecalis, as well as its capacity to inhibit some virulence factors linked to antimicrobial resistance. Some tests have been performed in order to reduce the use of chemical products, as Melaleuca alternifolia (tea tree oil), Ocotea odorifera (popularly known as sassafras) and Eucalyptus viminalis (popularly known as eucalypt) essential oils exerts insecticidal action against the larvae and adults of mealworms. The main chemical used to control A. diaperinus is cypermethrin, a chemical product that can damage the soil fauna due to its intensive utilization. The use of GML did not cause negative effects in the soil fauna, in disagreement other study with GML at concentrations of 50 and 100 µg mL-1 and found negative effects on the soil fauna using adults and juvenile forms of springtails (Folsomia candida) as biomarkers, showing a LD50 of 41 µg mL-1. Based on these evidences, we can suggest that the toxicity of GML to soil fauna is related to the biomarker used to determine the toxicity. Therefore, it is possible to conclude that GML possesses insecticidal action without toxic effects for the soil fauna, demonstrating potential as an alternative method to control the lesser mealworm

ANTIMYCOBACTERIAL, ANTIMICROBIAL AND ANTIFUNGAL ACTIVITIES OF GERANIUM OIL-LOADED NANO CAPSULES

Objective: The aim of this study was to perform the first ever investigation of the effect of activities in the nano capsules containing Geranium oil (NC1) against different species of pathogens such as Mycobacterium genus (both fast growing and slow growing), bacterial, and yeasts.Methods: The GO was analyzed by GC and GC/MS. Nano capsule suspensions (NC) were prepared by interfacial deposition of a preformed polymer method and the MICs were determined for the antimycobacterial, antimicrobial, and antifungal activities.Results: GO-loaded nano capsules (NC1) presented nano metric mean diameters (188 nm), polydispersity indices below 0.149, pH (5.5), and zeta potentials (about-10.8 mV). The MICs were determined for the antimycobacterial, antimicrobial, and antifungal activities. The NC1 was effective to Mycobacterium smegmatis (149.7 µg ml-1), M. abscessos (35.9 µg ml-1), M. massiliense (35.9 µg ml-1), M. avium (71.8 µg ml-1), Enterococcus faecalis, Streptococcus sp. (149.7 µg ml-1) and Listeria monocytogenes (35.9 µg ml-1). The NC1 was able to significantly reduce the number of cells of C. albicans (by approximately 5 log), 4 log the number of cells of C. dublinensis, C. glabrata, and C. krusei, and 2 log the number of cells of C. parapsilosis compared to the control group.Conclusion: Our study showed that the geranium oil-loaded nano capsules have antimycobacterial activities similar to free oil. The GO was effective in inhibiting the formation of germ tubes of Candida albicans, yet the nano capsule containing GO failed to inhibit the formation of this important virulence factor.Â

INFLUENCE OF PEPTIDE P34 ON GENE EXPRESSION OF LISTERIA MONOCYTOGENES AND LISTERIA SEELEGERI

Objective: Investigate the influence of the antimicrobial peptides P34 and nisin on the expression of genes associated with components of the cell surface of Listeria monocytogenes and Listeria seeligeri.Methods: Antimicrobial activity was determined by addition of peptide P34 and nisin (12.5 µg/ml) onto Brain Heart Infusion agar (BHI) plates previously inoculated with indicator strains (L. monocytogenes ATCC 7644 or L. seeligeri AC 82/4) after incubation for 24 h at 37 °C or 240 h at 4 °C. Ribonucleic acid (RNA) was directly extracted from bacterial colonies at the border of the inhibition zones, and the expression levels of genes D-alanine-D-alanyl carrier protein ligase (dltA), putative phospholipid lysinylation (Imo 1695) and EIIABMan of mannose-specific PTS (mptA) were determined using real-time PCR.Results: A non-significant increase in the levels of transcription of genes dltA, Imo1695 and mptA was observed for L. monocytogenes treated with peptide P34 or nisin. Both peptides caused a similar decrease in dltA gene expression in L. seeligeri. The expression of gene Imo1695 significantly decreased (about 2000-fold) after treatment with the peptide P34 at 37 °C, while at 4 °C a reduction of 12-fold and 5-fold was detected for P34 and nisin, respectively. A significant decrease in mptA gene expression was observed by exposition to peptide P34 (31.872-fold) and nisin (16.047-fold) for 24 h at 37 °C.Conclusion: The results suggest that both peptide P34 and nisin influence the expression of genes related with the cell-surface/cell-membrane structure of L. seeligeri and in lesser extent L. monocytogenes

Safety profile, antimicrobial and antibiofilm activities of a nanostructured lipid carrier containing oil and butter from Astrocaryum vulgare: in vitro studies

Ethnopharmacological relevance: Tucumã (Astrocaryum vulgare)is a fruit native to the Amazon region. Extracts from the peel and pulp are thought of as promising treatments for bacterial infections. The primary constituents of Tucumã oil and butter possess unsaturated carbon chains that are susceptible to oxidation by light or heat. The oils have high volatility and low aqueous solubility that limits their use without a vehicle. Nanotechnology refers to techniques to solve these problems. Nanostructured lipid carriers (NLC), for example, protect fixed oils degradation by heat or light, as well as from oxidation and evaporation, ensuring greater stability and function, thereby prolonging the useful life of the final product. Study objectives: The objective of this study was to evaluate the hemolytic, cytotoxic, antimicrobial and antibiofilm properties of an NLC containing Tucumã butter and oil soasto improve the solubility and photosensitivity of the compounds, generating better pharmacological efficacy. Materials and methods: The NLC was assessed for stability for 60 days. The cytotoxicity of nanoparticles in peripheral blood mononucleated cells was determined in culture using assays for cell viability, DNA damage, oxidative metabolism and damage to human erythrocytes. Antimicrobial activity was determined using the broth microdilution technique and antibiofilm activity according to standardized protocols. Results: The Tucumã NLC remained stable throughout the evaluated period, with pH between 5.22–5.35, monodisperse distribution (PDI<0.3) and average particle size of 170.7 ± 3nm. Cytotoxicity studies revealed that the NLC is safe and modulates inflammatory processes, demonstrated by increased cell viability and nitric oxide levels. There was low hemolytic activity of the NLC against human erythrocytes almost concentrations tested. Conclusion: Taken together, the data suggest that NLC containing Tucumã oil and butter showed antimicrobial and antibiofilm activity against organisms that cause morbidity and mortality in humans. They may be alternative solutions to public health problems related to bacterial infections