Good afternoon Peter. Today we completed your first quarterly service. Glad to hear the pest activity on the interior has decreased. We inspected the exterior of the home and found evidence of bird activity in that bathroom vent. Those mites on the inside are more than likely bird mites. We recommend having someone removing that birds nest from the vent. Unfortunately, we do not deal with birds. However, we did treat around that vent on the outside, along with the foundation with a liquid residual insecticide. If activity on the interior arises, please don’t hesitate to contact our office. As always, thank you for choosing Green Pest solutions and have a wonderful day.