BackgroundMalaria is considered as one of the most significant health difficulties in the world, notably in developing countries and tropical areas, which is caused by a blood-borne parasite called Plasmodium and is often transmitted through the bites of Anopheles mosquitos (1). The disease is also transmitted through blood transfusion using a common syringe, organ transplantation, and from the mother to the fetus through the placenta (1, 2). In addition, P. vivax, P. falciparum, P. ovale, P. malariae, and P. knowlesi are the species of Plasmodium that lead to malaria in people. Among these species, P. vivax is the most common type and P. falciparum is the most severe and most dangerous one (3,4). The three species of P. vivax, P. falciparum, and P. malariae exist in Iran (4). Approximately half of the world community lived at the risk of malaria in 2017. More precisely, there were 219 million malaria cases and malaria deaths have been 435,000 in this year (5). Some population groups such as children under the age of five, pregnant women, infants, HIV/AIDS patients, nonimmune immigrants, and travelers are at the higher risk and develop the disease more severely compared to other people (6). The complications of this disease include affecting cerebral malaria, respiratory and renal systems or hemorrhage, metabolic acidosis, and hypoglycemia (7-9). One of the dominant problems in fighting malaria in Iran has been illegal immigration from neighboring countries such as Afghanistan and Pakistan to Iran while malaria was native in these countries and entered the southern areas of the country by these immigrants (10). Malaria has a declining trend in Iran and is mostly reported in the southern regions of Iran, especially in Sistan and Baluchestan, Kerman, and Bushehr provinces. Larestan is also located in the south of Iran near Bushehr and Jahrom, and the trend of this disease is decreasing in these cities (5). It should be noted that malaria is endemic in Iran, especially in the southern regions of the country. Considering the favorable weather conditions of this region for the survival of the life cycle of malaria and the entrance of illegal immigrants from neighboring countries, studying the prevalence and epidemiology of this disease in malaria-endemic regions of Iran has always been of importance. Accordingly, the current study focused on identifying the extent of these cases over the past few years in one of the southern regions of Larestan, located in Fars Province, Iran.
MethodsThe present cross-sectional study was conducted in