Malaria is an acute infectious disease caused by protozoan parasites of the genus Plasmodium and transmitted by the bites of female mosquitoes of the genus Anopheles. The main symptoms include fever, chills, sweating, headache, muscle and joint pain. In severe cases, malaria can lead to serious complications such as anemia, respiratory distress syndrome, kidney failure, and even death. Malaria remains one of the most significant global health problems, especially in tropical and subtropical regions where conditions favor the reproduction of disease vectors.
History of the disease and interesting historical facts
Historical records of malaria date back to ancient Egypt, where its symptoms were described in papyri. In ancient Rome, malaria was a widespread disease. In 1880, French microbiologist Alphonse Laveron discovered that malaria was caused by parasites, which was an important step in understanding the mechanism of the disease. In the early 20th century, the first effective antimalarial therapy, quinine, was developed. The conditions for the spread of malaria are discussed in the work "Malaria and its Control", which was published in 1935. The disease also affected wars, when troops without access to drugs and preventive measures suffered from a decrease in combat effectiveness.
Epidemiology
According to the World Health Organization (WHO), more than 247 million cases of malaria were registered in 2022, and about 619 thousand deaths were recorded. Most cases are observed in regions such as sub-Saharan Africa, Southeast Asia and several Latin American countries. In the summer of 2020, an article was published in the specialized journal "Lancet Infectious Diseases" stating: "The effectiveness of preventive measures has significantly decreased due to climate change and increased population mobility." Children and pregnant women are most susceptible to the disease, which is associated with their weakened immune system.
Genetic predisposition to this disease
Genetic susceptibility to malaria has been studied to a limited extent. It is known that some genetic variations can increase resistance to infection. For example, mutations in the HBB gene responsible for the synthesis of beta-globin lead to the formation of the sickle cell trait (valley form of hemoglobin), which provides some protection against Plasmodium falciparum. Other genes, such as G6PD, are also associated with defense mechanisms against malaria. A recent study published in the journal Nature Genetics emphasizes that “individual genetic predisposition may not only influence susceptibility to infection but also the subsequent course of the disease.”
Risk factors for the development of this disease
There are numerous risk factors that contribute to the development of malaria. These include:
- Long stays in endemic areas where mosquito population density is high.
- Lack of or insufficient protection against bites (mosquito nets, repellents).
- Unclean and unstable health care system makes diagnosis and treatment difficult.
- The influence of social and economic factors such as poverty and lack of education.
- The presence of comorbidities, such as HIV, that may reduce the immune response.
Diagnosis of this disease
The main method of diagnosing malaria is a clinical examination for symptoms. Laboratory tests include:
- Microscopic examination of blood to detect parasites.
- Immunological tests (eg, lateral flow immunoassay).
- Polymerase chain reaction (PCR) for detection of specific Plasmodium species.
Radiological reagents such as ultrasound can also be used to evaluate the internal organs in case of complications. Differential diagnosis should be made with other infectious diseases such as viral hepatitis and DEN.
Treatment
Treatment of malaria involves several key approaches:
- General treatment aimed at relieving symptoms such as fever and pain.
- Pharmacological treatment using antimalarial drugs, including artemisinin and its derivatives.
- In severe cases, hospitalization and intravenous administration of drugs may be required.
- Preventive treatment for travellers aimed at preventing disease.
Modern treatment approaches also include the use of combination therapies to reduce the likelihood of resistance.
List of medications used to treat this disease
The most widely used drugs for the treatment of malaria are:
- Artemisinin and its derivatives (artemether, artermethyl).
- Chloroquine.
- Mefloquine.
- Pyrimethamine.
- Sulfadoxine-pyrimethamine.
New promising drugs are at the clinical trial stage.
Disease monitoring
Constant monitoring of the patient's condition allows us to evaluate the effectiveness of treatment measures and prevent complications. Control stages include:
- Regular tests for the presence of the malaria parasite in the blood.
- Assessment of the severity of clinical manifestations.
- Monitoring the development of side effects from the therapy.
The prognosis depends on the speed of diagnosis and initiation of treatment, but one should not forget about possible complications such as pulmonary failure or renal failure, which significantly worsen the prognosis.
Age-related features of the disease
The pathogenesis of malaria in children and adults may differ. In children, especially younger ones, the form of the disease is often more severe and can quickly develop into severe anemia. In older people with many concomitant diseases, the risks of complications also increase significantly. It is important to take into account the immune status and medical history for adequate treatment planning.
Questions and Answers
- How is malaria transmitted? Malaria is transmitted through the bites of female Anopheles mosquitoes, which carry parasites.
- What are the symptoms of malaria? The main symptoms include fever, chills, sweating, headache and muscle aches.
- Can malaria be prevented? Yes, malaria can be prevented through the use of repellents, mosquito nets and prophylactic use of antimalarial drugs.
- How is malaria treated? Treatment of malaria involves the use of antimalarial drugs such as artemisinin, as well as symptomatic therapy.
- What is the prognosis for malaria? The prognosis depends on the speed of diagnosis and the start of treatment, but complications can worsen the outcome of the disease.
