Vibrio cholerae classical (CL) biotype was isolated, along with biotype El Tor (ET) and altered ET carrying the cholera toxin (CTX) gene of CL biotype, during the 1991 cholera epidemic in Mexico, subsequently becoming endemic until 1997. Microbiological, molecular, and phylogenetic analyses of V. cholerae isolated from both clinical and environmental samples during 1998–2008 confirm important genetic events, namely predominance of ET over CL and altered ET in Mexico. Although altered ET is predominantly associated with cholera globally, progression of CTX+ V.

Delhi with fast-growing rate of urbanisation is the second most water-stressed cities in the world according to this new research published in Global Environmental Change Journal which has mapped 500 large cities to determine how global urbanisation is affecting water supplies. Kolkata (6), Chennai (18), Bangalore (19) and Hyderabad (20) are also listed in this first global survey of the large cities’ water sources.

A growing number of studies link chronic exposure to inorganic arsenic (iAs) with risk of diabetes. Many of these studies assessed iAs exposure by measuring arsenic (As) species in urine. However, this approach has been criticized because of uncertainties associated with renal function and urine dilution in diabetic individuals. In this study the researchers measured concentrations of trivalent and pentavalent iAs, methyl-As (MAs), and dimethyl-As (DMAs) species in EUC from 374 residents of Chihuahua, Mexico, who were exposed to iAs in drinking water.

Approaches to integrated landscape management are currently garnering new interest as scientists, policymakers, and local stakeholders recognize the need to increase the multi-functionality of agricultural landscapes for food production, livelihood improvement, and ecosystem conservation. Such approaches have been attempted in many parts of Latin America and the Caribbean (LAC) but to date there has been no systematic assessment of their characteristics, outcomes, and limitations.