Illness in returned travelers and immigrants/refugees: the 6-year experience of two Australian infectious diseases units.
BACKGROUND
Data comparing returned travelers and immigrants/refugees managed in a hospital setting is lacking.


METHODS
We prospectively collected data on 1,106 patients with an illness likely acquired overseas who presented to two hospital-based Australian infectious diseases units over a 6-year period.


RESULTS
Eighty-three percent of patients were travelers and 17% immigrants/refugees. In travelers, malaria (19%), gastroenteritis/diarrhea (15%), and upper respiratory tract infection (URTI) (7%) were the most common diagnoses. When compared with immigrants/refugees, travelers were significantly more likely to be diagnosed with gastroenteritis/diarrhea [odds ratio (OR) 8], malaria (OR 7), pneumonia (OR 6), URTI (OR 3), skin infection, dengue fever, typhoid/paratyphoid fever, influenza, and rickettsial disease. They were significantly less likely to be diagnosed with leprosy (OR 0.03), chronic hepatitis (OR 0.04), tuberculosis (OR 0.05), schistosomiasis (OR 0.3), and helminthic infection (OR 0.3). In addition, travelers were more likely to present within 1 month of entry into Australia (OR 96), and have fever (OR 8), skin (OR 6), gastrointestinal (OR 5), or neurological symptoms (OR 5) but were less likely to be asymptomatic (OR 0.1) or have anaemia (OR 0.4) or eosinophilia (OR 0.3). Diseases in travelers were more likely to have been acquired via a vector (OR 13) or food and water (OR 4), and less likely to have been acquired via the respiratory (OR 0.2) or skin (OR 0.6) routes. We also found that travel destination and classification of traveler can significantly influence the likelihood of a specific diagnosis in travelers. Six percent of travelers developed a potentially vaccine-preventable disease, with failure to vaccinate occurring in 31% of these cases in the pretravel medical consultation.


CONCLUSIONS
There are important differences in the spectrum of illness, clinical features, and mode of disease transmission between returned travelers and immigrants/refugees presenting to hospital-based Australian infectious diseases units with an illness acquired overseas.
O'Brien
Daniel P
DP
Victorian Infectious Diseases Service, Centre for Clinical Research Excellence, Royal Melbourne Hospital, Victoria, Australia. obrien@amsterdam.msf.org
Leder
Karin
K
Matchett
Elizabeth
E
Brown
Graham V
GV
Torresi
Joseph
J
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001315:Australia / Q000453:epidemiology; D001424:Bacterial Infections / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D003141:Communicable Diseases / Q000453:epidemiology*; D016001:Confidence Intervals; D004641:Emigration and Immigration / Q000706:statistics & numerical data*; D006801:Humans; D017053:Infection Control / Q000458:organization & administration / Q000706:statistics & numerical data*; D008875:Middle Aged; D016017:Odds Ratio; D010342:Patient Acceptance of Health Care / Q000706:statistics & numerical data; D011159:Population Surveillance; D011314:Preventive Health Services / Q000706:statistics & numerical data; D012036:Refugees / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D018709:Statistics, Nonparametric; D014195:Travel; D014330:Tropical Medicine