First Molecular Diagnosis of Oestrus ovis (Linnaeus, 1758) Larvae Causing Conjunctival Ophthalmomyiasis in Mexico City, Mexico
Por:
Olivera-Pérez, CI, Lagunas-Calvo, O, Cortés-González, V, Oceguera-Figueroa, A, García-Prieto, L, Peña-Ortiz, S, Hernández-Piñamora, LA, Reyna-Fabián, ME
Publicada:
1 sep 2024
Ahead of Print:
1 jul 2024
Resumen:
Purpose Human ophthalmomyiasis is a rare ocular parasitosis that results from the accidental infestation of dipteran larvae of several species, including Oestrus ovis (Linnaeus, 1758). This study aims to present the fourth documented human case of ophthalmomyiasis in Mexico, identifying the etiological agent through morphological and molecular analyses. Additionally, we investigated the phylogenetic position and genetic distances among different specimens globally characterized based on mitochondrial Cox1 sequences. Methods A total of five larval specimens were extracted from the patient's eye, with two specimens allocated for identification based on morphological features using a stereomicroscope, and the remaining three preserved in absolute ethanol, one of them used for subsequent analysis using molecular methods. The mitochondrial Cox1 region was amplified and sequenced using automated Sanger sequencing. The resulting sequence was deposited in GenBank under accession number OR440699 and subjected to BlastN analysis against 35 other Cox1 sequences of O. ovis from GenBank. The identity and phylogenetic position of the strains were further explored using parsimony and maximum likelihood phylogenetic methods. Results Morphological examination of the larval specimens extracted from the patient's eye unequivocally identified them as O. ovis species. BlastN analysis and comprehensive phylogenetic investigations involving a total of 36 Cox1 sequences confirmed the taxonomic identity of the larvae. Notably, our sequence was positioned within the cluster formed by the Brazilian and two Iranian samples. This finding underscores a shared genetic ancestry among these distinct geographical isolates and provides valuable insights into the evolutionary relationships within O. ovis populations. Conclusion The presence of O. ovis infestation in Mexico City suggests potential shifts in environmental conditions favoring fly proliferation, highlighting the need for vigilance in urban healthcare settings.
Filiaciones:
Olivera-Pérez, CI:
Univ Nacl Autonoma Mexico, Fac Ciencias, Dept Biol, Mexico City 04510, Mexico
Lagunas-Calvo, O:
Univ Nacl Autonoma Mexico, Dept Zool, Lab Helmintol, Inst Biol, ,Ciudad Mex, Mexico City 04510, Mexico
Cortés-González, V:
Asociac Evitar Ceguera Mexico, Dept Genet, Mexico City 04030, Mexico
Oceguera-Figueroa, A:
Univ Nacl Autonoma Mexico, Dept Zool, Lab Helmintol, Inst Biol, ,Ciudad Mex, Mexico City 04510, Mexico
García-Prieto, L:
Univ Nacl Autonoma Mexico, Dept Zool, Lab Helmintol, Inst Biol, ,Ciudad Mex, Mexico City 04510, Mexico
Peña-Ortiz, S:
Asociac Evitar Ceguera Mexico, Dept Oftalmol, Mexico City 04030, Mexico
Hernández-Piñamora, LA:
Asociac Evitar Ceguera Mexico, Dept Oftalmol, Mexico City 04030, Mexico
Reyna-Fabián, ME:
Inst Nacl Pediat, Lab Biol Mol, Subdirecc Invest Med, Mexico City 04530, Mexico
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