Malaria is a life-threatening infectious disease caused by Plasmodium parasites and transmitted through the bite of infected female Anopheles mosquitoes. It remains a major public health concern, particularly in tropical and subtropical regions.
- It is not directly contagious, but can spread through infected blood transfusion or contaminated needles.
- The most severe infections are caused by:
- Plasmodium falciparum (most deadly)
- Plasmodium vivax (widespread, causes relapses)
Transmission and Life Cycle
- Transmission occurs when an infected female Anopheles mosquito bites a human.
- The parasite enters the bloodstream and initially infects the liver, followed by red blood cells.
- Cyclical destruction of red blood cells leads to characteristic fever episodes.
Symptoms
Symptoms typically appear 10–15 days after infection and include:
- Fever with chills and sweating
- Headache
- Fatigue and muscle pain
Severe malaria may lead to:
- Seizures
- Respiratory distress
- Jaundice
- Dark urine (blackwater fever)
- Organ failure and death if untreated
In endemic regions, individuals may develop partial immunity, leading to milder or atypical symptoms.
Diagnosis
Early diagnosis is critical and is done through:
- Microscopic examination of blood smears
- Rapid Diagnostic Tests (RDTs)
Treatment
Treatment depends on the species and severity:
- Artemisinin-based Combination Therapies (ACTs) – for P. falciparum
- Chloroquine – for P. vivax (where resistance is absent)
- Primaquine – prevents relapse in P. vivax and P. ovale
- Severe cases require injectable antimalarial drugs in hospital settings
Prevention
Prevention focuses on vector control and personal protection:
- Use of insecticide-treated mosquito nets (ITNs)
- Indoor residual spraying
- Use of repellents such as DEET, IR3535, and Icaridin
- Wearing protective clothing
- Chemoprophylaxis for travellers in endemic areas
Global Initiative
- World Malaria Day is observed annually on 25 April.
- The 2025 theme: “Malaria Ends With Us: Reinvest, Reimagine, Reignite”, emphasizing renewed global commitment.
Significance
- Major contributor to morbidity and mortality, especially among children and pregnant women
- Impacts economic productivity and public health systems
- Closely linked with climate, sanitation, and vector ecology
Conclusion
Malaria remains a preventable and treatable disease, yet continues to pose serious challenges in many regions. Effective control requires a combination of early diagnosis, timely treatment, vector management, and sustained public health interventions.
