Description
Introduction:
In several malaria-endemic areas throughout India, there is a co-existence of non-falciparum species alongside the Plasmodium falciparum parasite. Conventional diagnostic methods, such as microscopy and rapid diagnostic tests, are conventionally employed for malaria diagnosis. However, microscopy often fails to detect secondary malaria parasites in cases of mixed infections, leading to potential misdiagnosis and misinterpretation of Plasmodium species. This misclassification is critical, as the treatment protocols for P. falciparum and Plasmodium vivax differ, as stipulated by India's national vector-borne disease control program.
Methods:
Blood samples were systematically collected from malaria-endemic regions spanning Jharkhand, Madhya Pradesh, Chhattisgarh, Maharashtra, Odisha, Assam, Meghalaya, Mizoram, and Telangana in India, covering a comprehensive geographic representation. A molecular diagnosis of Plasmodium species was conducted specifically among microscopically confirmed P. falciparum samples obtained during a therapeutic efficacy study conducted across various years.
Results and Discussion:
Polymerase chain reaction (PCR) analysis has revealed a significant prevalence (18%) of mixed malaria parasite infections within P. falciparum samples confirmed by microscopy from malaria patients. These cases, which microscopy either overlooked or failed to detect, underscore the crucial role of molecular diagnostic tools in accurately identifying mixed-species infections. The distribution of malaria parasites varies across different regions of India, influenced by geographical terrain and climatic conditions. In certain malaria-endemic areas, multiple species of malaria parasites coexist, leading to mixed infections, with P. falciparum and P. vivax being common. Notably, the national antimalarial drug policy prescribes different treatments for P. falciparum and P. vivax. Given that malaria treatment, particularly in remote endemic regions of India, heavily relies on microscopic blood smear results, there is a heightened risk of misinterpretation. In such scenarios, microscopy may erroneously identify the dominant infection as the sole causative parasite species, potentially resulting in incorrect treatment. This misdiagnosis or misinterpretation of diagnostic results could contribute to the emergence of other species, such as P. vivax, in an area. National guidelines advocate treating patients based on microscopy results, increasing the likelihood of P. vivax relapses in individuals with mixed infections. This phenomenon may be a contributing factor to the escalating number of P. vivax infections observed in India.
Conclusions:
The integration of molecular tools in regions with mixed-species infections plays a pivotal role in ensuring precise diagnosis and appropriate malaria treatment. This approach not only addresses the challenges posed by microscopy limitations but also aligns with the overarching objective of achieving malaria elimination in India.
Acknowledgments: We thank all the study participants and their relatives for providing informed consent and the staff of the community health centers and primary health centres, particularly the medical officers, for their help and support. SN thanks the ICMR, New Delhi, India for the Senior Research fellowship
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