S. ThaithongN. SiripoonN. SeugomD. BunnagG. H. BealeChulalongkorn UniversityMahidol UniversityUniversity of Edinburgh2018-06-142018-06-141989-01-01Transactions of the Royal Society of Tropical Medicine and Hygiene. Vol.83, No.5 (1989), 602-60518783503003592032-s2.0-0024426566https://repository.li.mahidol.ac.th/handle/20.500.14594/15773A new electrophoretic variant of glucose phosphate isomerase (GPI), which we now denote GPI-3, has been found in isolates of Plasmodium falciparum from 6 patients, all of whom acquired the infection in the same region (in or near Prachinburi province) of Thailand. In other regions, from which 453 isolates have been tested, only GPI-1 and/or GPI-2 have been found. Two isolates of P. malariae from patients at Kanchanaburi showed a band of GPI activity on cellulose acetate gels at a cathodal position quite distinct from that of any previously known GPI variants in other human malaria parasites. Thirty- nine isolates of P. vivax from 3 regions of Thailand have been examined for variants of GPI and lactate dehydrogenase (LDH). Three forms of GPI were found, corresponding approximately in band positions to GPI-1, 2 and 3 of P. falciparum. The position of the band of LDH activity in P. vivax was the same in all the isolates examined, and different from that of LDH-1 in P. falciparum. © 1989 Oxford University Press.Mahidol UniversityImmunology and MicrobiologyMedicineArticleSCOPUS10.1016/0035-9203(89)90368-4