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Background   Plasmodium vivax  malaria is a major public health problem in India. Control of vivax malaria is challenging due to various factors including relapse which increase the burden significantly. There is no well studied marker to differentiate relapse from reinfection. This creates hindrance in search for anti-relapse medicines. The genomic study of minisatellite can help in characterization of relapse and new infection of vivax malaria.    Methods  Eighty-eight samples of  P. vivax  were collected from malaria clinic. All the 14 chromosomes of  P. vivax  were scanned for minisatellite marker by Tandem Repeat Finder software Version 4.07b. Minisatellite marker CH1T1M13779 from chromosome one was applied for genotyping in 88 samples of  P. vivax  including 2 recurrence cases.    Results  Whole genome of  P. vivax  was scanned and found to have one hundred minisatellite markers. CH1T1M13779 minisatellite marker from chromosome-1 was used for amplification in 88 samples of  P. vivax.  Of 66 amplified samples, 14 alleles were found with varied allele frequency. The base size of 280 (13.63 %) 320 bp (13.63 %) and 300 bp (16.66 %) showed the predominant allele in the  P. vivax  population. Genotyping of two paired samples (day 0 and day relapse) could demonstrate the presence of relapse and reinfection.    Conclusion  The CH1T1M13779 can be potential minisatellite marker which can be used to differentiate between relapse and new infection of  P. vivax  strain.

Genotyping of Plasmodium vivax by minisatellite marker and its application in differentiating relapse and new infection