Identification and disruption of bacteria associated with sheep scab mites-novel means of control?

Area of Science:

• Veterinary Parasitology
• Microbiology
• Animal Health

Background:

• Psoroptes ovis mites cause sheep scab (psoroptic mange), a significant economic and welfare concern in sheep farming.
• Understanding the mite's microbiome is crucial for developing novel control strategies against sheep scab.

Purpose of the Study:

• To identify bacterial endosymbionts in Psoroptes ovis mites as potential targets for controlling sheep scab.
• To investigate the transmission of bacteria from mites to the sheep skin environment.

Main Methods:

• Internal transcribed spacer (ITS) sequencing was used to characterize bacteria in mite fecal trails and on sheep fleece.
• Polymerase chain reaction (PCR), including endosymbiont-specific PCR, was employed to detect Comamonas sp. in P. ovis.
• Antibiotic treatments were administered to mites via their diet to assess the impact on mite survival and bacterial density.

Main Results:

• A diverse bacterial community was identified in P. ovis, with Comamonas sp. identified as a potential endosymbiont candidate.
• Antibiotic administration significantly reduced P. ovis mite survival and altered their internal bacterial density.
• Bacterial density within mites was correlated with mite survival, suggesting a link between the mite microbiome and its viability.

Conclusions:

• The study identified potential bacterial targets within P. ovis for sheep scab control.
• Disrupting mite-associated bacteria, though not via antibiotics directly, shows promise for novel sheep scab management strategies.
• Further research into targeting P. ovis bacterial communities could lead to effective and sustainable control methods for sheep scab.