I came across this old case and thought it details a lot of interesting aspects of infestation dynamics:
http://bedbugger.com/forum/topic/found-three-bugs-in-bathtub-so-far-where-can-they-be-coming-from
https://bedbugger.com/forum/topic/time-to-introduce-myself
Interesting details:
- The extent of dispersal caused by foggers.
- How infestations spread to other units. Particularly interesting how the severe 1st floor infestation spread more to the 3rd floor unit than the 2nd floor unit.
- How bugs found in a bathroom are often a sign of a migration issue from a neighboring unit.
- How important communication, cooperation, education and comprehensive inspection/treatment is in multi-unit buildings.