David Itzcoatl Martínez-Herrera

Environmental parameters influence on the dynamics of total and pathogenic Vibrio parahaemolyticus densities in Crassostrea virginica harvested from Mexico’s Gulf coast

The influence of environmental parameters on the total and pathogenic Vibrio parahaemolyticus seasonal densities in American oysters (Crassostrea virginica) was evaluated for 1 year. Harvesting site A yielded the highest mean densities of V. parahaemolyticus tlh+, tdh+/trh-, tdh-/trh+ and tdh+/trh+ during spring season at 2.57, 1.74, 0.36, and -0.40 log10 MPN/g, respectively, and tdh+/orf8+ during winter season (0.90 log10 MPN/g). V. parahaemolyticus tlh+ densities were associated to salinity (R(2)=0.372, P<0.022), tdh+/trh+ to turbidity (R(2)=0.597, P<0.035), and orf8+ to temperature, salinity, and pH (R(2)=0.964, P<0.001). The exposure to salinity and temperature conditions during winter and spring seasons regulated the dynamics of V. parahaemolyticus harboring potentially pathogenic genotypes within the oyster. The adaptive response of V. parahaemolyticus to seasonal environmental changes may lead to an increase in survival and virulence, threatening the seafood safety and increasing the risk of illness.

Isolation of Brucella abortus from the milk of serum positive cows using chiken embryos as amplifier

According with the World Health Organization (WHO) brucellosis is considered the most important known zoonosis and also causes huge economic loss in the affected countries (Mantur and Amarnath, 2008; WHO, 1997). The main domestic animals susceptible brucellosis are those used by human for consumption such as cattle, goats, sheep and swine. Other domestic and wild mammals are susceptible too and could be considered as a transmission resources (Corbel, 1997; Rodriguez et al., 2001; Young, 1995). Usually, human acquires the infection accidentally by ingesting unpasteurized dairy products or by direct

Epidemiology of Human Leptospirosis in the Central Region of Veracruz, Mexico

Aims: To epidemiologically characterize patients confirmed as cases of leptospirosis in Central Veracruz, Mexico based on official records. Study Design: Descriptive retrospective study.