The potential effectiveness of screening arriving travelers to prevent or delay infl uenza epidemics has been debated. Mathematical models and literature reviews have argued for (7, 8) and against (9-11) this approach. Some authors have found that entry screening for respiratory conditions or infl uenza A(H1N1)pdm09 is insensitive and not cost-effective (12) . Border screening did not substantially delay local transmission of infl uenza A(H1N1) pdm09 (13) .