Bloodmeal Identification in Field-Collected Sand Flies From Casa Branca, Brazil, Using the Cytochrome b PCR Method

Area of Science:

• Veterinary Entomology
• Molecular Biology
• Parasitology

Background:

• Polymerase Chain Reaction (PCR) is a valuable tool for identifying vertebrate hosts from bloodmeals in hematophagous vectors.
• The mitochondrial cytochrome b (Cyt b) gene is frequently used for species identification due to its conserved regions and variable sequences.

Purpose of the Study:

• To identify the vertebrate bloodmeal sources of hematophagous sand flies in Casa Branca, Brazil, using a PCR-based DNA sequencing method.
• To evaluate the efficacy of a previously established PCR protocol targeting the Cyt b gene for bloodmeal analysis in sand fly vectors.

Main Methods:

• A previously published PCR protocol utilizing primers from the mitochondrial cytochrome b gene was employed.
• DNA was extracted from 362 engorged female sand flies belonging to species including Lutzomyia longipalpis, Migonemyia migonei, and Nyssomyia whitmani.
• PCR amplification of a 359 bp fragment of the Cyt b gene was performed, followed by DNA sequencing for host identification.

Main Results:

• Successful amplification and identification of bloodmeal sources were achieved in 192 out of 362 (53%) analyzed female sand flies.
• The identified bloodmeal sources included human, dog, chicken, and domestic rat.
• The study confirmed the presence of multiple vertebrate hosts for the analyzed sand fly populations in the study area.

Conclusions:

• The PCR-based method is effective for identifying diverse vertebrate bloodmeal sources in sand flies.
• Understanding sand fly feeding patterns is crucial for epidemiological studies of vector-borne diseases.
• This research provides valuable data on host-vector interactions in the Casa Branca region of Brazil.