Bulletin of the World Health Organization

Entry and exit screening of airline travellers during the A(H1N1) 2009 pandemic: a retrospective evaluation

Kamran Khan, Rose Eckhardt, John S Brownstein, Raza Naqvi, Wei Hu, David Kossowsky, David Scales, Julien Arino, Michael MacDonald, Jun Wang, Jennifer Sears & Martin S Cetron

Volume 91, Number 5, May 2013, 368-376

Table 2. Characteristics of the health screening strategies that might have been used to detect A(H1N1) pandemic influenza in travellers in May 2009a

Characteristic Strategy
Exit Targeted entryb Indiscriminate entryc
No. of cities where screening would have been required 35 82 1111
No. of low-risk travellers who would have had to be screenedd 6017 6017 67 373 584
No. of travellers who would have had to be screened for every at-risk travellerd 1.01 1.01 116.4
No. of travel hours until screening
  Median (interquartile range) 0 (0–0) 3.37 (2.57–4.33) 3.35 (2.5–4.58)
  Mean 0.1 4.28 4.32

a The data come from modelled scenarios in which the theoretical aim was to prevent air travellers carrying A(H1N1)pdm09 out of Mexico in May 2009.

b The screening of travellers on international flights arriving directly from Mexico.

c The screening of travellers on international flights arriving from any international airport worldwide.

d The 583 774 air travellers who initiated international travel from any domestic or international airport in Mexico in May 2009 were considered “at-risk” while all other travellers were considered “low-risk”.