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Pigs are the primary host for Ornithodoros erraticus ticks, which can transmit Borrelia hispanica. Blood meal analysis reveals pigs, humans, and livestock are key hosts, aiding in understanding disease transmission.

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Area of Science:

  • Veterinary Entomology
  • Medical Entomology
  • Parasitology

Background:

  • Ornithodoros erraticus is a soft tick found in Iberian pigpens, acting as a vector for human tick-borne relapsing fever (Borrelia hispanica).
  • Understanding tick-host interactions and reservoirs is crucial for managing Borrelia hispanica transmission.

Purpose of the Study:

  • To identify the hosts of Ornithodoros erraticus ticks in southern Portugal using blood meal analysis.
  • To investigate the role of different vertebrate hosts in maintaining tick populations and potentially Borrelia hispanica.

Main Methods:

  • Collected 349 Ornithodoros erraticus ticks from two pigpens in southern Portugal.
  • Performed blood meal analysis using PCR amplification of vertebrate cytochrome b on 79 ticks.

Main Results:

  • Pigs were the predominant host (46.8%), followed by humans (35.4%), bovine (13.9%), sheep (5.1%), rodents (1.3%), and birds (1.3%).
  • Mixed blood meals (human-pig, sheep-pig, bovine-pig) were identified in 1.3% of samples.
  • Pigs play a major role in sustaining Ornithodoros erraticus populations, with humans acting as accidental hosts.

Conclusions:

  • Blood meal analysis is vital for identifying tick hosts and understanding disease transmission dynamics.
  • Pigs are crucial for Ornithodoros erraticus maintenance, while other livestock and wildlife have minor roles.
  • This study provides insights into the sylvatic cycle of Borrelia hispanica in the Iberian Peninsula.