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Latitudinal patterns of travel among returned travelers with influenza: results from the GeoSentinel Surveillance Network, 1997-2007.
J Travel Med. 2012 Jan-Feb; 19(1):4-8.JT

Abstract

BACKGROUND

Influenza is a common vaccine-preventable disease among international travelers, but few data exist to guide use of reciprocal hemisphere or out-of-season vaccines.

METHODS

We analyzed records of ill-returned travelers in the GeoSentinel Surveillance Network to determine latitudinal travel patterns in those who acquired influenza abroad.

RESULTS

Among 37,542 ill-returned travelers analyzed, 59 were diagnosed with influenza A and 11 with influenza B. Half of travelers from temperate regions to the tropics departed outside influenza season. Twelve travelers crossed hemispheres from one temperate region to another, five during influenza season. Ten of 12 travelers (83%) with influenza who crossed hemispheres were managed as inpatients. Proportionate morbidity estimates for influenza A acquisition were highest for travel to the East-Southeast Asian influenza circulation network with 6.13 (95% CI 4.5-8.2) cases per 1000 ill-returned travelers, a sevenfold increased proportionate morbidity compared to travel outside the network.

CONCLUSIONS

Alternate hemisphere and out-of-season influenza vaccine availability may benefit a small proportion of travelers. Proportionate morbidity estimates by region of travel can inform pre-travel consultation and emphasize the ease of acquisition of infections such as influenza during travel.

Authors+Show Affiliations

Tropical Disease Unit, UHN-Toronto General Hospital, Toronto, ON, M5G 2C4 Canada. andrea.boggild@utoronto.caNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

22221805

Citation

Boggild, Andrea K., et al. "Latitudinal Patterns of Travel Among Returned Travelers With Influenza: Results From the GeoSentinel Surveillance Network, 1997-2007." Journal of Travel Medicine, vol. 19, no. 1, 2012, pp. 4-8.
Boggild AK, Castelli F, Gautret P, et al. Latitudinal patterns of travel among returned travelers with influenza: results from the GeoSentinel Surveillance Network, 1997-2007. J Travel Med. 2012;19(1):4-8.
Boggild, A. K., Castelli, F., Gautret, P., Torresi, J., von Sonnenburg, F., Barnett, E. D., Greenaway, C. A., Lim, P. L., Schwartz, E., Wilder-Smith, A., & Wilson, M. E. (2012). Latitudinal patterns of travel among returned travelers with influenza: results from the GeoSentinel Surveillance Network, 1997-2007. Journal of Travel Medicine, 19(1), 4-8. https://doi.org/10.1111/j.1708-8305.2011.00579.x
Boggild AK, et al. Latitudinal Patterns of Travel Among Returned Travelers With Influenza: Results From the GeoSentinel Surveillance Network, 1997-2007. J Travel Med. 2012 Jan-Feb;19(1):4-8. PubMed PMID: 22221805.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Latitudinal patterns of travel among returned travelers with influenza: results from the GeoSentinel Surveillance Network, 1997-2007. AU - Boggild,Andrea K, AU - Castelli,Francesco, AU - Gautret,Philippe, AU - Torresi,Joseph, AU - von Sonnenburg,Frank, AU - Barnett,Elizabeth D, AU - Greenaway,Christina A, AU - Lim,Poh-Lian, AU - Schwartz,Eli, AU - Wilder-Smith,Annelies, AU - Wilson,Mary E, AU - ,, Y1 - 2011/12/08/ PY - 2012/1/7/entrez PY - 2012/1/10/pubmed PY - 2012/12/10/medline SP - 4 EP - 8 JF - Journal of travel medicine JO - J Travel Med VL - 19 IS - 1 N2 - BACKGROUND: Influenza is a common vaccine-preventable disease among international travelers, but few data exist to guide use of reciprocal hemisphere or out-of-season vaccines. METHODS: We analyzed records of ill-returned travelers in the GeoSentinel Surveillance Network to determine latitudinal travel patterns in those who acquired influenza abroad. RESULTS: Among 37,542 ill-returned travelers analyzed, 59 were diagnosed with influenza A and 11 with influenza B. Half of travelers from temperate regions to the tropics departed outside influenza season. Twelve travelers crossed hemispheres from one temperate region to another, five during influenza season. Ten of 12 travelers (83%) with influenza who crossed hemispheres were managed as inpatients. Proportionate morbidity estimates for influenza A acquisition were highest for travel to the East-Southeast Asian influenza circulation network with 6.13 (95% CI 4.5-8.2) cases per 1000 ill-returned travelers, a sevenfold increased proportionate morbidity compared to travel outside the network. CONCLUSIONS: Alternate hemisphere and out-of-season influenza vaccine availability may benefit a small proportion of travelers. Proportionate morbidity estimates by region of travel can inform pre-travel consultation and emphasize the ease of acquisition of infections such as influenza during travel. SN - 1708-8305 UR - https://www.unboundmedicine.com/medline/citation/22221805/Latitudinal_patterns_of_travel_among_returned_travelers_with_influenza:_results_from_the_GeoSentinel_Surveillance_Network_1997_2007_ L2 - https://academic.oup.com/jtm/article-lookup/doi/10.1111/j.1708-8305.2011.00579.x DB - PRIME DP - Unbound Medicine ER -