Cooler geographic areas may have longer lag periods due to a prolonged flea life cycle. (medi-vet.com)
Hains, in his «old lag period» at the time, presented his galvanized sheets. (en.wikipedia.org)
This view is often based on the misleading interpretation that nothing happens during the lag period (often described as being 4 — 6 quarters). (rba.gov.au)