title: Mansonella ozzardi infection in Bolivia: prevalence and clinical associations in the Chaco region.
abstract: A cross-sectional survey carried out in the Chaco region of Bolivia showed that 26% (77 of 296) and 0.7% (2 of 298) of the rural population of the Camiri and Villa Montes areas, respectively, harbored Mansonella ozzardi microfilariae (mf). No significant differences were observed between sexes. The lowest prevalence (9%) was in the 0-14-year-old age group, with no children <11 months of age infected. The prevalence increased sharply in the 25-34-year-old age group (32%), and continued increasing in the older age classes. Microfilaremia, ranging from 1 to 305 mf/20 microl of blood, was lowest in 0-14-year-old children (geometric mean concentration = 1.1 mf/20 microl), and increased with age (>100 mf/20 microl in people >44 years old). An expected increasing sensitivity with the blood volume examined was observed. No significant association between clinical symptoms (fever, skin rash, pruritus, headache, lymphedema, elephantiasis, and articular pain) and microfilaremia was observed.
authors.affiliation: Clinica di Malattie Infettive, Università di Firenze, Firenze, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Bartoloni
authors.forename: G
authors.initials: G
authors.lastname: Cancrini
authors.forename: F
authors.initials: F
authors.lastname: Bartalesi
authors.forename: D
authors.initials: D
authors.lastname: Marcolin
authors.forename: M
authors.initials: M
authors.lastname: Roselli
authors.forename: C C
authors.initials: CC
authors.lastname: Arce
authors.forename: A J
authors.initials: AJ
authors.lastname: Hall
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000818:Animals; D001838:Bolivia / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007223:Infant; D016015:Logistic Models; D008297:Male; D008366:Mansonella / Q000302:isolation & purification*; D008368:Mansonelliasis / Q000097:blood / Q000453:epidemiology*; D008875:Middle Aged; D018512:Parasitemia / Q000453:epidemiology; D015995:Prevalence; D012424:Rural Population; D017678:Sex Distribution