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However, Mexico has remained free from cholera for a decade [1]. Overall, despite the epidemic waves of the 1990s, Latin America as a whole is currently almost free of cholera, with the dramatic exception of human-induced cholera in Hispaniola [1]. Residual environmental toxigenic V.?cholerae strains probably exist here and there, and cause occasional human contamination, but no significant epidemic has been reported for over a decade. Madagascar is, in many respects, similar to Hispaniola. It is an island with deficient sanitation, a susceptible hydrogeological environment, widespread water-fed rice paddies, political tensions, and lack of resources, that was plagued by successive cholera waves from 1999 to 2001. However, Madagascar [http://www.selleckchem.com/products/ch5424802.html Protein Tyrosine Kinase inhibitor] has not experienced any new outbreak in the ensuing 10?years. This evolution from highly epidemic cholera to absent cholera, previously described in West Africa, raise hopes that the disease might be eliminated or at least greatly reduced, and undermine the fatalistic hypothesis that countries experiencing severe epidemics are doomed to live forever with the pathogen, owing to permanent environmental contamination. The fact that the recent severest cholera outbreaks originated in inland territories such as central Haiti and the African lakes region suggests that the epidemiological link between clinical cholera and estuarine environments is weak outside its initial source in the Bay of Bengal. The importance of rivers and fresh water for environmental suitability for the cholera organism is the subject of contemporary study and debate, as cholera epidemiology is proving to be more complicated than just the [http://en.wikipedia.org/wiki/Mianserin Mianserin HCl] product of a relationship between sea surface temperatures of estuarine waters and bacterial resurgence [32]. The role of new variants in cholera epidemics should be noted. [http://www.selleckchem.com/epigenetic-reader-domain.html Epigenetic inhibitor] The three most severe cholera epidemics in the last 4 years were caused by a new, atypical El Tor strain, which had a potentially more toxigenic genetic content than usually found in classical strains. The so-called seventh cholera pandemic, which was alleged to have started in Indonesia in 1961, was in fact composed of several waves of cholera transmission arising from the Bay of Bengal [33]. The new atypical variant responsible for the most recent wave proved to be able to gradually replace the classical El Tor strain in South Asia [34�C36] and to spread into Central Africa and Caribbean Sea in