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Climate Change and Epidemiology of Human Parasitoses in Saudi Arabia: a Review

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Climate Change and Epidemiology of Human Parasitoses in Saudi Arabia: a Review Journal of Coastal Life Medicine 2016; 4(7): 580-588 580 Journal of Coastal Life Medicine journal homepage: www.jclmm.com Review article doi: 10.12980/jclm.4.2016J6-100 ©2016 by the Journal of Coastal Life Medicine. All rights reserved. Climate change and epidemiology of human parasitoses in Saudi Arabia: A review Wael Mohamed Lotfy1*, Souad Mohamed Alsaqabi2 1Parasitology Department, Medical Research Institute, Alexandria University, Alexandria, Egypt 2Biology Department, Faculty of Science, Qassim University, Unizah, Saudi Arabia ARTICLE INFO ABSTRACT Article history: Climate change is an emerging global problem. It has hazardous effects that vary across Received 6 Jun 2016 different geographic regions and populations. It is anticipated to have significant effects in Received in revised form 27 Jun 2016 Saudi Arabia. The present work reviews the future of human parasitoses in Saudi Arabia in Accepted 5 Jul 2016 response to the expected climate change. The key projections are increased precipitations, flash Available online 11 Jul 2016 floods, unstable temperatures, sea-level rise and shoreline retreat. Such environmental changes could strongly influence the epidemiology of fly-borne, mosquito-borne, snail-borne and water-borne human parasitoses in the country. Keywords: Global warming Kingdom of Saudi Arabia Parasites Fly-borne Mosquito-borne Snail-borne Water-borne Infection 1. Introduction It is important to understand how the epidemiology of human parasites may respond to the climate change expected in the country Climate change is one of the most serious and rapidly emerging in the next decades. Thus, it is timely and appropriate to make a global issues. Such change and its sequels are strongly affected brief revision on the predicted climate change and its consequences by human activities and not by natural fluctuations[1]. Human on the epidemiology of human parasitoses in Saudi Arabia. activities that depend on fossil fuels as a source of energy result in the production of greenhouse gases like CO2. Such gases cause 2. Geography temperature-increment in the troposphere. Recent global warming is unusual in the view of the time scale accompanied with natural The largest country on the Arabian Peninsula is Saudi Arabia. climate oscillations. Many reports showed the sensitivity of It has a total surface area of nearly 2.15 million km2. It lies in the water resources to climate change. The variations in temperature, tropical and subtropical desert area in the intersection of Asia, evaporation, precipitation, the recharge to aquifers and the general Europe and Africa (latitude: 16.5° N–32.5° N; longitude: 33.75° hydrologic cycle are all interacting[2]. Climate change is anticipated E–56.25° E)[5,6]. The country has an arid climate with high to have significant consequences on ecosystems and socioeconomic temperatures. However, there are great variations in temperature systems[3,4]. Saudi Arabia, like many countries in the world, suffers between the different geographical areas and seasons[6]. The from severe climate change that will mainly influence peoples’ mean daily temperature varies from 15 °C in January to 33 °C behaviour, health and agriculture. Studies on correlations between in July[7]. The country experiences an extreme water scantiness. climate change and public health in Saudi Arabia are still lacking. Rain is the only renewable water source. It comes in a sudden short period with high-intensity storms and is mostly dissipated [5,8] *Corresponding author: Prof. Wael Mohamed Lotfy, Parasitology Department, by evaporation . Rainfall depths varies from 0–300 mm/ Medical Research Institute, 165 El-Horreya Avenue, Alexandria, Egypt. year in the Eastern Desert and the South-Western areas, Tel: +20100-815 4959 respectively[7]. The country is characterised by tremendous E-mail: [email protected] The journal implements double-blind peer review practiced by specially invited groundwater reserves which are continuously under increasing international editorial board members. demand[9]. Wael Mohamed Lotfy and Souad Mohamed Alsaqabi/Journal of Coastal Life Medicine 2016; 4(7): 580-588 581 2. Climate change 3. Impacts of climate change on human parasitoses in Saudi Arabia Recently, some areas of Saudi Arabia were exposed to snowing, heavy rains, flash floods, and unstable temperatures which may be Climate change could strongly affect human parasitic infections due to climate change[10-14]. During the period 1982–2005, flooding transmitted through cold-blooded (ectothermic) animals (insects was the most frequent hazard affecting the country with an average and snails) in Saudi Arabia (Figure 1). Such intermediate hosts annual return period of 7 times and an average annual economic are sensitive to slight temperature, precipitation and humidity cost of 19 million USD[11]. Climate change significantly affected the changes. Daylight duration, sea level elevation and the wind are also global precipitation patterns. Saudi Arabia is anticipated to receive important[21,22]. In addition, many other interacting factors may more rainfall and flash flood than before[15]. Flash floods during the affect the epidemiology of human parasitoses such as the migration period 2000–2010 have caused significant loss of life and property of human and animal populations, the deterioration of public health in the lowland areas of Saudi Arabia. Intense rainfall caused infrastructure, changes in land-use and the appearance of drug flooding of settlements in a number of basins, particularly the resistance[23]. Jeddah, Riyadh, Makkah, Tabuk and other areas of the kingdom[16]. Distribution Rate of deveopment On the 25th of November 2009, the city of Jeddah was flooded after Parasite more than 90 mm of rain falling within a period of 4 h. The local Transmission season civil defence authorities described it as the most destructive rainfall Distribution during the past 27 years. Unfortunately, more than 100 deaths and Feeding rate Climate change about 350 missing persons were reported. The business harms were Population growth estimated to about 1 billion Saudi Arabian Riyal[12]. A similar event Survival Susceptibility of more than 110 mm rain falling within a short duration flooded Intermediate host Abundance and population size Jeddah again on the 26th of January 2011. There was an enormous Habitats and breeding sites loss of property and only a few human deaths[12]. In Saudi Arabia, Survival a general warming was recorded all over the country during the Humidity Survival period 1991–2003. It was in the range of 0.15 °C to 0.75 °C, with Figure 1. Main impacts of climate change on parasitic infections an average of 0.40 °C[17]. Temperature, precipitation, wind speed, transmitted to human through insect and snail hosts. evaporation and runoff were investigated to assess the effect of 5. Fly-borne diseases climate change on water resources in the country. It was found that under A2 scenario, the period from 2071 to 2100 will generally Climate has powerful impacts on natural populations of the experience warmer weather. The eastern region is expected to different species of flies. Global warming is anticipated to affect register the maximum increase in temperature (4.5 °C) and the survival, generation time, fecundity and dispersal of flies[24]. southern region is anticipated to register the minimum increase of daily temperature (3.9 °C). Almost all regions are anticipated 6. Leishmaniasis to show a significant increase in average daily rainfall (30% or more). The central region is expected to show the maximum It is a zoonotic disease caused by protozoan parasites of the genus increase of average daily precipitation (46%). In contrast, only the Leishmania. Leishmaniasis is endemic in a total of 88 countries northern region is expected to show a 4% decrease in average daily distributed throughout Africa, Asia, Europe and the Americas. precipitation. There is no expected significant change in the surface Leishmaniasis manifests mainly in three forms: cutaneous, wind speeds over most of the country. The eastern and northern mucocutaneous and visceral (kala-azar)[25-27]. There are about 700 regions are anticipated to show a little decrease in the speed of species of sandflies of which about 70 are considered to transmit winds. The Empty Quarter is projected to record the maximum human diseases[28]. Leishmania is transmitted by over 30 species of increase in wind speeds (8%). The average daily evaporation sandflies. Rodents, dogs, wild cats, jackals, foxes, sloths, hyraxes, is unexpected to greatly increase. An increase of 3% or less is and other carnivores are the main animal reservoirs in nature. anticipated over the eastern, central, western and northern regions. Sandflies of the genus Phlebotomus are widespread in North Africa, The Empty Quarter is expected to record an increase of 11% and the Arabian Peninsula, Turkey and Iran[29]. the southern region is expected to show the maximum increase Cutaneous and visceral leishmaniasis are known to be endemic (15%). Runoff is expected to show the greatest change in all other in Saudi Arabia: cutaneous leishmaniasis is the dominant form of studied parameters. The western region is expected to have a 353% the disease and visceral leishmaniasis is less common. Most cases increase of average daily runoff and each of the remaining regions of cutaneous leishmaniasis are infected with Leishmania major. is expected to have more than a 100% increase. This high increase In addition, Leishmania tropica (L. tropica) has been found to may warn for flash flood events[18]. Climate change is anticipated be less frequently associated with this form of the disease[30,31]. to stimulate sea level rise and associated coastal flooding that Leishmania major causes zoonotic cutaneous leishmaniasis which may affect low-lying coastal areas of Saudi Arabia[19]. The most is transmitted to human from infected rodents (Psammomys obesus vulnerable coastal areas are the eastern coast of the country along and Meriones libycus), while L. tropica causes anthroponotic the Gulf especially Khafji, Jubail, Ras Tanura and Dammam. In cutaneous disease[32].
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