However, a decreasing trend of HTLV-1 prevalence was observed in Peruvian female SWs from 1993 to 2010 and no further cases among SWs born after 1979.
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Work-Related Human T-lymphotropic Virus 1 and 2 (HTLV-1/2) Infection: A Systematic Review.
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The sentences
In fact, for the Jamaican occupational groups, an apparent trend toward a higher prevalence in jobs consistent with a lower socioeconomic status was observed, while Japanese fishermen could represent a familial rather than an occupational cluster, also in view of the geographic isolation of these areas.