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Pantavou, K. The Impact of Climate Change on Cholera. Encyclopedia. Available online: https://encyclopedia.pub/entry/18854 (accessed on 02 July 2024).
Pantavou K. The Impact of Climate Change on Cholera. Encyclopedia. Available at: https://encyclopedia.pub/entry/18854. Accessed July 02, 2024.
Pantavou, Katerina. "The Impact of Climate Change on Cholera" Encyclopedia, https://encyclopedia.pub/entry/18854 (accessed July 02, 2024).
Pantavou, K. (2022, January 26). The Impact of Climate Change on Cholera. In Encyclopedia. https://encyclopedia.pub/entry/18854
Pantavou, Katerina. "The Impact of Climate Change on Cholera." Encyclopedia. Web. 26 January, 2022.
The Impact of Climate Change on Cholera
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This entry is adapted from the peer-reviewed paper 10.3390/atmos11050449

Water ecosystems can be rather sensitive to evolving or sudden changes in weather parameters. These changes can result in alterations in the natural habitat of pathogens, vectors, and human hosts, as well as in the transmission dynamics and geographic distribution of infectious agents. 

climate change cholera vibrio water-borne disease water-borne pathogens infection

1. Introduction

Climate change exposes individuals and organized human societies to risk affecting human health both directly and indirectly. Risks are disproportionately distributed and greater for marginalized and disadvantaged people and communities. The direct impact (for example, heat-related morbidity and mortality or injuries) arises from changing patterns of temperature and rainfall, and changes in the frequency and strength of climatic extremes (heatwaves, hurricanes, and floods) [1][2]. Indirect pathways include effects of climate change on water resources, on food production systems, on population displacement, and on prevalence and incidence of infectious pathogens [3]. Climate change can affect the epidemiological dynamics of multiple infectious agents, including vector-borne, water-borne, and food-borne pathogens. For instance, high temperatures can change the replication, virulence, and survival of microbes; and heavier and frequent precipitation may overwhelm sanitation systems or the viability and geographical distribution of mosquitoes. Even pathogens that pass directly from an infected person to a susceptible one can be influenced by climate change. For instance, human immunodeficiency virus (HIV) and sexually transmitted infections are likely to occur in settings of climate change-related conflicts or in the context of forced population movement, as people will increasingly compete for valuable but scarce natural resources.
Water-borne diseases are those associated with water, i.e., people become infected following contact with water or ingestion of water or consumption of contaminated seafood [4]. Common water-borne transmitted pathogens include Campylobacter, Vibrios, Calicivirus, Giardia, and Cryptosporidium [5]. Cholera and other diseases caused by Vibrio (V.) species (Vibrio parahaemolyticus, Vibrio vulnificus) comprise major water-borne ailments in some areas and a priority health issue given projected further warming and long-lasting impacts on all elements of the climate system, including oceans and the water cycle [6]. Cholera is a gastrointestinal infectious disease caused by V. cholerae, a comma-shaped Gram-negative rod. V. cholerae is found in salty and fresh water, commonly in coastal areas or estuaries [6]. Under adverse environmental conditions and organic nutrient depletion, V. cholerae can form biofilms and survive in a dormant state [7]. V. cholerae, as other pathogenic Vibrio species, such as V. parahaemolyticus, V. vulnificus, and V. alginolyticus, have seasonal distribution, with a predominance of infections occurring in the warmer months in temperate zones [6].

2. Vibrio cholera—An Overview of Epidemiology, Transmission, and Clinical Disease

It is estimated that about 2.86 million (1.3 m–4.0 m) cholera cases occur annually in endemic countries with 95,000 (21,000–143,000) deaths per year [8]. Cholera is endemic in several developing countries in Asia, Africa, and Latin America. In countries with high population density, limited access to safe drinking water and suboptimal sanitation practices or disruption of public health systems, continue to cause significant morbidity and mortality. On the other hand, in developed countries, there is an increased frequency of Vibrio spp. infections, which may be associated with anthropogenic climate change.
Over 200 serotypes of V. cholerae have been identified; however, serotypes O1 and O139 are those predominantly causing disease and outbreaks in human populations [8]. Serotype O1 is further characterized based on phenotypic characteristics as classical or El Tor biotype. The El Tor O1 strains have spread around the globe and displaced the classical biotype strains during the last decades [9][10].
V. cholerae spp. are transmitted through the ingestion of contaminated water or food and by the fecal-oral route. The incubation period ranges from 1 to 5 days [11]. Non-cholera Vibrio spp., such as V. parahaemolyticus, V. vulnificus, and V. alginolyticus, are transmitted through contaminated seafood and direct exposure to water. They cause a considerable number of infections, especially in the United States (US), where sufficient data are collected due to the strong surveillance system for vibrioses [6]. Most Vibrios cause gastrointestinal disease, however, some (i.e., V. vulnificus) can cause severe wound infections. Clinically, cholera is characterized by profuse diarrhea resulting in severe dehydration and death without therapeutic intervention. Treatment is supportive, and the most important therapeutic measure is the administration of oral rehydration solution (ORS) or intravenous fluids [12]. Antimicrobials are also effective; however, antimicrobial resistance to sulfamethoxazole–trimethoprim, ciprofloxacin, aminoglycosides, chloramphenicol, and azithromycin has been described [10]. There are four available oral vaccines, two primarily for travelers (Dukoral, Vaxchora) and two mainly used in mass campaigns for populations at risk (Shanchol, Euvichol) [13]; however global supply is limited. From a public health perspective, prompt detection of an outbreak followed by source identification and control are paramount measures in the management of cholera. Improving sanitation systems, securing access to clean water, and vaccination campaigns have been shown to decrease disease burden associated with cholera.

Climate-Driven Changes in the Epidemiology of Cholera and Other Vibrio Species

V. cholerae, like other pathogens, requires certain environmental conditions (30 °C temperature, pH 8.5, 15% salinity), to survive and thrive [6]. When encountered with more hostile circumstances, V. cholerae persists for long periods in its aquatic niche in a dormant state, or interacts with tiny planktonic crustaceans and animals, such as oysters and copepods [14][15]. Ocean currents can displace plankton together with attached Vibrios [16].
During the nineteenth century, six pandemics occurred, first at coastlines, while dispersion was achieved through maritime activity. All pandemics were attributed to contaminated water from rivers or swampy waters. Moreover, they started from Bangladesh and were caused by V. cholerae serotype O1 [16][17]. Details about the cholera pandemics are presented in Table 1. During 1926–1960 and in light of improvements in water management, it was assumed that cholera pandemics could be a part of history. However, at the end of the twentieth century, a different spread of a new V. cholerae biotype (El Tor) was observed, causing the seventh pandemic. It started in Indonesia in 1961 and spread to Africa and South America over the next decades [16]. Almost all South American countries were involved during the last pandemic, and climate change seems to have played a role. In South America (from January 1991 in Peru until February 1991 in Ecuador), there was an almost simultaneous appearance of outbreaks at a distance of more than 2100 km. The El-Nino event, which causes phytoplacton blooms due to the confluence of rain and nutrients from land into the warm SST, could explain the geographically distant cholera outbreaks since a large “infectious dose” of V. cholerae may have originated from river overflow [14]. In detail, the infectious dose of 10³ V. cholerae cells could be provided by one copepod as each one usually carries more than 10⁴ V. cholerae cells, and during a plankton bloom, several copepods are contained in a glass of untreated water. In 1992 an outbreak of the new V. cholerae serogroup 0139 caused a large outbreak in India and Southeast Asia [14][17].
Table 1. Cholera pandemics.
Period Start from Spread to Cholera Strain
1817–1823 India (Bengal) China, Indonesia, Europe, East Africa V. cholerae serotype O1, classical biotype
1829–1851 India Russia (Moscow),
America (New York, Manhattan, Philadelphia, New Orleans), Hungary, Germany, London, Egypt		 V. cholerae serotype O1, classical biotype
1852–1859 India North Africa, South America (Brazil) V. cholerae serotype O1, classical biotype
1863–1879 India (Ganges Delta) Naples, Spain V. cholerae serotype O1, classical biotype
1881–1896 India Europe, Asia, South America V. cholerae serotype O1, classical biotype
1899–1923 India Egypt, Arabian peninsula, Persia V. cholerae serotype O1, classical biotype
1961–ongoing Indonesia East Pakistan, the Soviet Union, North Africa V. cholerae serotype O1, El Tor biotype
The El Niño/Southern Oscillation (ENSO) periodicity has been connected to many cholera outbreaks and is characterized as a ‘powerful natural experiment’ [18]. The extreme weather conditions of higher temperature, increased rainfall, and consequent flooding, associated with one of the strongest ENSO events, which occurred in 1997 and lasted until 1998, may explain the global surge of outbreaks observed between 1997 through 1999 [18]. As Mercedes et al. showed in their study [19], the interannual variability of cholera cases correlates with the ENSO time series. In this regard, climate variability seems to affect disease dynamics. During the last two decades of the 20th century, this strong association between ENSO and cholera accounts for more than 70% of the disease variance [20]. Moreover, other events, such as the Northern Hemisphere Temperature and Atlantic Multidecadal Oscillation, are known to correlate positively with Vibrios abundance [21].
Climate variations may also affect the genetic diversity of strains between epidemics through environmentally driven changes in the expression of virulence factors [22]. Genetic variability of clinical and environmental strains during and between epidemics occurring in the last 20 years in Bangladesh and neighboring countries, as well as clonal variability of toxigenic V. cholera, have been well documented [23][24][25][26]. Environmental factors, such as rainfall, seem to influence serotype selection (between O1 and O139 strains), as shown by Goel et al., in two subsequent epidemics in India [27]. Rainfall, as well as increased salinity and water temperature, enhances V. cholerae biofilm formation, potentially by affecting the expression of genes responsible for vibrio polysaccharide synthesis (vps) [28][29]. Another example is the predominance of the El Tor biotype over the classical one during suboptimal climatic conditions due to its better fitness, owing again to the expression of the vps gene [30]. Moreover, transduction, which can give rise to novel toxigenic clones, is enhanced by certain environmental conditions, including optimal temperature, sunlight, and osmotic conditions [31].
An increase in SST seems to be a critical factor not only for Vibrio persistence but also for the emergence of new Vibrio spp. habitats (Table 2). Data from the Baltic Sea during the last decades have confirmed these warming patterns, which correspond closely with the emergence and spread of Vibrio infections in the area. Furthermore, many reports of Vibrio-associated wound infections were recorded during the warm summers of 1994, 2003, and 2006 when SST exceeded 19 °C for more than three weeks. Baker-Austin et al. [6] showed that climate change has affected aquatic bacterial communities and the emergence of Vibrio disease in temperate areas. The authors explain the variability of Vibrio-related disease using generalized linear models (GLM) by maximum SST and time, concluding in a very strong association between SST and Vibrio cases. Several biological explanations support these results, including increased bacterial replication in high temperatures, temperature mediated pathogenicity of Vibrio spp., and increased leisure activities, such as bathing during such circumstances. Vezzulli et al. [32] also proposed a similar relationship between climate change and Vibrio disease using generalized additive models. Abundance of Vibrio was induced by an increase in SST, up to 1.5 °C during the past 54 years, and this was positively correlated with northern hemisphere temperatures [21][32]. From a different perspective, another study, involving the coastal Bay of Bengal, concluded that the association between SST and cholera could be explained from the presence and dominance of high river discharge [33]. This was proposed after showing that phytoplankton-related chlorophyll and SST were positively correlated during high river discharge and negatively correlated during low river discharge. Based on this finding, the authors suggested that cholera prediction models will benefit from the inclusion of nutrient influx and phytoplankton and zooplankton blooms, in addition to other climatic variables for the early detection of outbreaks. In addition, Lipp et al. [31] highlighted in their review that the likelihood of consuming an infectious dose of Vibrios during community use of untreated water is higher during the bloom of copepods. The association of cholera and commensal copepods could also inform models of early outbreak risk recognition based on SST, surface height, and plankton blooms. High salinity and elevated water temperature could influence the expression of regulatory and virulence genes found in V. cholerae, such as TfoX and the activity of Chi A2 [34]. Increased water temperature enhances V. cholerae growth by decreasing replication time, underlining the importance of environmental conditions and V. cholerae transmission dynamics [31]. Finally, another study found that the number of clinical cases in Bangladesh correlated with an air temperature of more than 28.6 °C and more than 4 hours of sunshine daily [35].
Table 2. New or expanding Vibrio cholerae habitats driven by climate variability/change.
New or Expanding Vibrio cholerae Habitats Climate Change Drivers
North Atlantic and North Sea [6] Sea surface temperature
Baltic Sea (Northern Europe) [7] Low salinity and rising water temperatures
Interestingly, using artificial intelligence applications, it has been shown that cholera cases were associated with periods of low precipitation and higher temperatures. Asadgol and colleagues [36] used artificial neural networks projecting from 2021 to 2050 to study the effect of climate change in cholera disease, using data from 1998 to 2016 of daily cholera infections in Qom city, Iran. A trend towards increasing cholera cases was observed with a significant correlation between low precipitation and cholera infection. Higher temperatures in warmer months could also contribute to this trend [36]. Similar tools, using artificial intelligence methods to model the association between disease cases and environmental conditions, could predict the risk for future outbreaks and thus inform early public health interventions. Other crucial predisposing factors that contribute to the occurrence of cholera outbreaks are rainfall patterns and floodings. After studying an outbreak of cholera in 2015 in South Sudan, investigators analyzed the rainfall patterns using deterministic and stochastic models [37]. They concluded that rainfall patterns are fundamental drivers for a cholera epidemic, and they were able to capture seasonal trends as well as short term seasonal fluctuations. Possible mechanistic ways for this rainfall drive are the increased exposure to contaminated water and contamination with bacteria from open-air defecation sites and overflows. Heavy rainfall and flooding are considered as important as well as common risk factors for cholera outbreaks worldwide during 1995-2005, explaining the global increase in such outbreaks during 1997 and 1999 [16].
Apart from endemic countries, the risk of imported V. cholerae is substantial in non-endemic countries with weak healthcare infrastructure and public health systems. The cholera outbreak in Haiti in 2010, following the large earthquake, was believed to have initiated from an imported strain from South Asia via international personnel [38][39]. However, the outbreak may have resulted in propagation due to favorable environmental conditions since the average temperature and rainfall had been above average around that time and before it began [40]. Notably, disruption of the public health system and lack of access to safe water also contributed to its course. Natural disasters and extreme weather events can cause the breakdown of healthcare infrastructure, jeopardize sanitation systems and access to clean water, and, overall, increase vulnerability to cholera epidemics in endemic regions.

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