Guest suites, long visits and frequent travel
Nearly every San Marino home is a detached, owner-occupied house, and many are large enough to have one or more guest bedrooms. Homes with a lot of coming and going β relatives staying for weeks, family members home from college dorms, frequent business or overseas trips, caregivers and household staff who travel between homes β simply have more chances for a stray bed bug to arrive. That is a matter of traffic, not of cleanliness or of who lives in the house.
Because shared walls are so rare here, the source is usually easier to trace than in an apartment building. A guest room that hosted a visitor last month, or the bedroom of someone who just returned from a trip, is where we look first.
Sources: [1]
