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A total of 82 strains of presumptive Aeromonas spp. were identified biochemically and genetically (16S rDNA-RFLP). The strains were isolated from 250 samples of frozen fish (Tilapia, Oreochromis niloticus niloticus) purchased in local markets in Mexico City. In the present study, we detected the presence of several genes encoding for putative virulence factors and phenotypic activities that may play an important role in bacterial infection. In addition, we studied the antimicrobial patterns of those strains. Molecular identification demonstrated that the prevalent species in frozen fish were Aeromonas salmonicida (67.5%) and Aeromonas bestiarum (20.9%), accounting for 88.3% of the isolates, while the other strains belonged to the species Aeromonas veronii (5.2%), Aeromonas encheleia (3.9%) and Aeromonas hydrophila (2.6%). Detection by polymerase chain reaction (PCR) of genes encoding putative virulence factors common in Aeromonas, such as aerolysin/hemolysin, lipases including the glycerophospholipid-cholesterol acyltransferase (GCAT), serine protease and DNases, revealed that they were all common in these strains. Our results showed that first generation quinolones and second and third generation cephalosporins were the drugs with the best antimicrobial effect against Aeromonas spp.In Mexico, there have been few studies on Aeromonas and its putative virulence factors. The present work therefore highlights an important incidence of Aeromonas spp., with virulence potential and antimicrobial resistance, isolated from frozen fish intended for human consumption in Mexico City. [Copyright &y& Elsevier]

Members of the genus Aeromonas are important enteropathogens. Commercial identification systems are often unable to correctly identify Aeromonas strains and misidentification as Vibrio spp. is common. A digoxigenin-DNA probe based on a 237 bp of the glycerophospholipid-cholesterol acyltransferase gene has been tested in a colony hybridization assay. The probe hybridized with all Aeromonas species tested (n = 16) but not with strains of other enteropathogenic bacteria (n = 20). The probe allowed the unequivocal identification of Aeromonas in primary isolation media within 36 h. [Copyright &y& Elsevier]

Even when new cases of syphilis are notifiable since 1944, the Mexican National Epidemiological Surveillance System lacks information on the changes of the rate of case reports considering the geographic and demographic variables. Therefore, it is necessary to have evidence, with particular attention to the study of the epidemiological behavior by the identification of risk factors and groups. The objective of this study was to analyze the epidemiology, geographical distribution, and forecast of syphilis in Mexico. The design of the study was a secondary research of epidemiological databases. A retrospective analysis of the national surveillance data (2007–2017) of acquired and congenital syphilis (CS) issued by the General Directorate of Epidemiology was performed. Of all cases, 34,998 and 1030 cases were reported for acquired syphilis (AS) and CS , respectively, reflecting an increasing trend in the whole country for both diseases. Cases and incidence of AS per year showed that, male gender presented an increase in reproductive age. Distribution of the rate of case reports is mostly commanded by the states in the extreme north (Gulf of California and northern Gulf of Mexico) and south (Gulf of southern Mexico and the Caribbean Sea). Likewise, the Seasonal Autoregressive Integrated Moving Average model was selected as the best-fit model for the forecast analysis. This model was used to forecast AS cases during 2018–2019. AS may have a slight fluctuation (on the rise) during the following 24 months. These findings underscore the importance of intensifying, as well as expanding screening and treatment in adult population, including men, who are not routinely benefiting from maternal and reproductive service-based syphilis screening and treatment. • Acquired and congenital syphilis shown an increasing trend. • Male gender shown an high incidence in reproductive age. • Acquired syphilis shown a correlation "cases/temperature" • SARIMA model was the best model for the forecast analysis of acquired syphilis [ABSTRACT FROM AUTHOR]

Abstract: Selective screening media for the detection and identification of Aeromonas strains are needed to guide primary isolation procedures in the clinical laboratory. This study compared the selective CromoCen® AGN chromogenic agar medium for the detection and identification of Aeromonas strains that were isolated from various samples against the conventional selective agar media that are commonly used for the isolation of this organism in food, environmental and clinical samples. The Miles and Misra and ecometric methods were used to evaluate the microbiological performance of CromoCen® AGN chromogenic agar medium, which was shown to be satisfactory. A total of 14 reference Aeromonas strains, 44 wild strains and 106 clinical stool specimens were examined using both non-chromogenic selective agars that are commonly used for Aeromonas isolation and CromoCen® AGN agar. The latter exhibited 94.73% sensitivity and 100% specificity for the various samples. On CromoCen® AGN agar medium, Aeromonas formed colonies with light green, greenish and salmon pigments with or without a surrounding wide transparent zone (halo) of 2–3mm in diameter around the entire border. This medium is recommended for the isolation and potential identification of the Aeromonas genus. [Copyright &y& Elsevier]