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SP has however, continued to be used in intermittent preventive treatment of malaria in pregnancy (IPTp) despite reports of high levels of resistance to SP due to the lack of alternatives to SP for IPTp. Recent reports have indicated recovery of CQ-susceptibility in Malawi, Kenya, Mozambique, and Tanzania based on the prevalence of wild types at codon 76 of the <jats:italic>Pfcrt<\/jats:italic> gene in indigenous <jats:italic>P. falciparum<\/jats:italic> populations. The current prevalence of this <jats:italic>Pfcrt-<\/jats:italic> 76 CQ resistance marker from six regions of Tanzania mainland is hereby reported.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Methods<\/jats:title>\n            <jats:p>DNA extracted from filter-paper dried blood spots and rapid diagnostics kit strips collected from finger-prick blood were used to genotype the <jats:italic>Pfcrt<\/jats:italic>-76 resistance marker using PCR-RFLP. Data from previously published studies were used to generate CQ susceptibility recovery trends using logistic regression model.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>Seven hundred and forty one (741) samples were genotyped. The current frequency of the CQ-susceptible <jats:italic>Pfcrt<\/jats:italic>-K76 was above 92% and did not differ between regions in Tanzania (<jats:italic>\u03c7<\/jats:italic> 2\u2009=\u20092.37; p\u2009=\u20090.795). The K76 allelic prevalence was between 85.7 and 93% in regions (<jats:italic>\u03c7<\/jats:italic> 2\u2009=\u20097.88, p\u2009=\u20090.163). The CQ resistance recovery trends showed regional variability that may be caused by differences in malaria transmission intensity, but overall the trends converge as the susceptibility levels in all regions approach &gt;90%.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions<\/jats:title>\n            <jats:p>CQ withdrawal in Tanzania has resulted into &gt;90% recovery of susceptibility in ten years of withdrawal. These findings are in support of the search for CQ-based combination drugs as a possible future alternative to SP for IPTp in places where full recovery of CQ-susceptibility will be evident.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1475-2875-12-415","type":"journal-article","created":{"date-parts":[[2013,11,14]],"date-time":"2013-11-14T02:01:49Z","timestamp":1384394509000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":69,"title":["Trends in chloroquine resistance marker, Pfcrt-K76T mutation ten years after chloroquine withdrawal in Tanzania"],"prefix":"10.1186","volume":"12","author":[{"given":"Asia","family":"Mohammed","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arnold","family":"Ndaro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Akili","family":"Kalinga","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alphaxard","family":"Manjurano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jackline F","family":"Mosha","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dominick F","family":"Mosha","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marco","family":"van Zwetselaar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jan B","family":"Koenderink","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frank W","family":"Mosha","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael","family":"Alifrangis","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hugh","family":"Reyburn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cally","family":"Roper","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reginald A","family":"Kavishe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2013,11,14]]},"reference":[{"key":"3013_CR1","doi-asserted-by":"publisher","first-page":"241","DOI":"10.1016\/0169-4758(87)90147-5","volume":"3","author":"D Payne","year":"1987","unstructured":"Payne D: Spread of chloroquine resistance in Plasmodium falciparum. 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