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Volume 19, Number 6—June 2013

Research

Effect of Travel on Influenza Epidemiology

Sanne-Meike BelderokComments to Author , Guus F. Rimmelzwaan, Anneke van den Hoek, and Gerard J.B. Sonder
Author affiliations: Public Health Service, Amsterdam, the Netherlands (S.-M. Belderok, A. van den Hoek, G.J.B. Sonder); Academic Medical Centre, Amsterdam (S.-M. Belderok, A. van den Hoek, G.J.B. Sonder); Erasmus Medical Center, Rotterdam, the Netherlands (G.F. Rimmelzwaan); National Coordination Centre for Traveler’s Health Advice, Amsterdam (G.J.B. Sonder)

Main Article

Table 2

Increase in titer and symptoms of influenza-like illness in 1,190 travelers from the Netherlands to (sub)tropical countries, October 2006–October 2007

Strain, subtype, pretravel titer No. travelers, n = 1,190 Titer >4-fold, no. (%), n = 120* Influenza-like illness, no. (%), n = 11
A
  H3N2
    <40 557 32 (6) 6 (19)
    >40† 633 12 (2) 1 (8)‡
  H1N1
    <40 862 24 (3) 1 (4)
    >40†
328
5 (2)
0
B/Malaysia
    <40 883 20 (2) 2 (10)
    >40†
307
3 (1)
0
B/Florida
    <40 820 22 (3) 1 (5)
    >40† 370 2 (1) 0

*>4-fold rise between pretravel and posttravel titer and posttravel titer >40.
>40: protective antibodies.
‡Symptoms probably caused by asthma.

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