Author(s): Rufalco-Moutinho, Paulo [UNESP] ; Kadri, Samir Moura [UNESP] ; Alonso, Diego Peres [UNESP] ; Moreno, Marta ; Carrasco-Escobar, Gabriel ; Prussing, Catharine ; Gamboa, Dionicia ; Vinetz, Joseph M. ; Mureb Sallum, Maria Anice ; Conn, Jan E. ; Martins Ribolla, Paulo Eduardo [UNESP]
Date: 2021
Persistent ID: http://hdl.handle.net/11449/210226
Origin: Oasisbr
Made available in DSpace on 2021-06-25T15:01:56Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-04-08
US National Institutes of Health ICEMR
Tropical Disease Research-WHO Contract
Vale do Rio Jurua in western Acre, Brazil, is a persistent malaria transmission hotspot partly due to fish farming development that was encouraged to improve local standards of living. Fish ponds can be productive breeding sites for Amazonian malaria vector species, including Nyssorhynchus darlingi, which, combined with high human density and mobility, add to the local malaria burden.This study reports entomological profile of immature and adult Ny. darlingi at three sites in Mancio Lima, Acre, during the rainy and dry season (February to September, 2017). From 63 fishponds, 10,859 larvae were collected, including 5,512 first-instar Anophelinae larvae and 4,927 second, third and fourth-instars, of which 8.5% (n = 420) were Ny. darlingi. This species was most abundant in not-abandoned fishponds and in the presence of emerging aquatic vegetation. Seasonal analysis of immatures in urban landscapes found no significant difference in the numbers of Ny. darlingi, corresponding to equivalent population density during the rainy to dry transition period. However, in the rural landscape, significantly higher numbers of Ny. darlingi larvae were collected in August (IRR = 5.80, p = 0.037) and September (IRR = 6.62, p = 0.023) (dry season), compared to February (rainy season), suggesting important role of fishponds for vector population maintenance during the seasonal transition in this landscape type. Adult sampling detected mainly Ny. darlingi (similar to 93%), with similar outdoor feeding behavior, but different abundance according to landscape profile: urban site 1 showed higher peaks of human biting rate in May (46 bites/person/hour), than February (4) and September (15), while rural site 3 shows similar HBR during the same sampling period (22, 24 and 21, respectively). This study contributes to a better understanding of the larvae biology of the main malaria vector in the Vale do Rio Jurua region and, ultimately will support vector control efforts.
Univ Estadual Paulista, Inst Biociencias Botucatu, Dept Bioestat Biol Vegetal Parasitol & Zool, Botucatu, SP, Brazil
Univ Estadual Paulista, Inst Biotecnol, Botucatu, SP, Brazil
London Sch Hyg & Trop Med, Dept Infect Biol, London, England
Univ Peruana Cayetano Heredia, Fac Ciencias & Filosofia, Lab ICEMR Amazonia, Labs Invest & Desarrollo, Lima, Peru
SUNY Albany, Sch Publ Hlth, Dept Biomed Sci, Albany, NY USA
Wadsworth Ctr, New York State Dept Hlth, Albany, NY USA
Univ Peruana Cayetano Heredia, Fac Ciencias & Filosofia, Dept Ciencias Celulares & Mol, Lima, Peru
Univ Peruana Cayetano Heredia, Inst Med Trop Alexander Humboldt, Lima, Peru
Yale Sch Med, Dept Internal Med, Sect Infect Dis, New Haven, CT USA
Univ Sao Paulo, Fac Saude Publ, Dept Epidemiol, Sao Paulo, Brazil
Univ Brasilia, Nucleo Med Trop, Brasilia, DF, Brazil
Univ Estadual Paulista, Inst Biociencias Botucatu, Dept Bioestat Biol Vegetal Parasitol & Zool, Botucatu, SP, Brazil
Univ Estadual Paulista, Inst Biotecnol, Botucatu, SP, Brazil
US National Institutes of Health ICEMR: U19 AI089681
Tropical Disease Research-WHO Contract: 201460655
