Effect of Travel on Influenza Epidemiology

SM Belderok, Guus Rimmelzwaan, A (Annemieke) Hoek, GJB Sonder

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Abstract

To assess the attack and incidence rates for influenza virus infections, during October 2006 October 2007 we prospectively studied 1,190 adult short-term travelers from the Netherlands to tropical and subtropical countries. Participants donated blood samples before and after travel and kept a travel diary. The samples were serologically tested for the epidemic strains during the study period. The attack rate for all infections was 7% (86 travelers) and for influenza-like illness (ILI), 0.8%. The incidence rate for all infections was 8.9 per 100 person-months and for ILI, 0.9%. Risk factors for infection were birth in a non-Western country, age 55-64 years, and ILI. In 15 travelers with fever or ILI, influenza virus infection was serologically confirmed; 7 of these travelers were considered contagious or incubating the infection while traveling home. Given the large number of travelers to (sub)tropical countries, travel-related infection most likely contributes to importation and further influenza spread worldwide.
Original languageUndefined/Unknown
Pages (from-to)925-931
Number of pages7
JournalEmerging Infectious Diseases
Volume19
Issue number6
DOIs
Publication statusPublished - 2013

Research programs

  • EMC MM-04-27-01

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