Enterobacteria (Enterobactereacea) isolated from synanthropic flies (Díptera, Calyptratae) in Medellín, Colombia.
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Cadavid Sánchez, Isabel Cristina | 2015
Enterobacteria (Enterobacteriaceae) causing enteric diseases can be carried and
dispersed through insects that act as mechanical vectors, especially flies (Insecta:
Diptera). In this study, enterobacteria associated with synanthropic flies were isolated
and identified; four different urban areas in the municipality of Medellín were
surveyed. Thirteen taxa of calyptrate flies belonging to four families were identified
and classified according to the Mechanical Vector Risk Index (MVRI) value, which
is proposed in this study. Chrysomya megacephala (Fabricius, 1794), Lucilia cuprina
(Wiedemann, 1819), Chrysomya albiceps (Wiedemann, 1819), and Musca domestica
Linnaeus, 1758 are of high risk; Fannia sp., Atherigona orientalis Schiner, 1868,
and Ophyra aenescens (Wiedemann, 1830) of moderate risk; remaining species
were classified as low or no risk. Escherichia coli was the most frequent bacterium
according to the number of isolations (32%), followed by Klebsiella oxytoca (12%),
Pasteurella pneumotropica (11%), and Kluyvera spp. (8%). Raoultella ornithinolitica,
Stenotrophomponas maltophilia, and Chryseobacterium menigosepticum were isolated
for the first time from flies. Finally, 22 new records of bacteria associated with eight fly
species are documented. These results allow us to foresee the existence of a generalist
pattern in the interaction between flies and bacteria and indicate that synanthropic
flies have a quantifiable potential as vectors of infectious diseases according to the
index proposed.
LEER