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Area of Science:

  • Infectious disease epidemiology
  • Public health surveillance
  • Travel medicine

Background:

  • Overseas travel is a known risk factor for acquiring infectious diseases.
  • Understanding the burden of travel-associated diseases is crucial for public health interventions.
  • Data on travel-related illness in New South Wales (NSW) requires further investigation.

Purpose of the Study:

  • To quantify the proportion of selected notified diseases in NSW attributable to overseas travel.
  • To assess the quality of data on travel-associated risk factors.
  • To inform targeted prevention strategies for travel-related infectious diseases.

Main Methods:

  • Analysis of 2010-2011 notification data for dengue, hepatitis A, hepatitis E, malaria, paratyphoid fever, shigellosis, and typhoid fever in NSW.
  • Extraction of data from the NSW Notifiable Conditions Information Management System.
  • Assessment of travel-associated risk factors for these diseases.

Main Results:

  • The proportion of cases acquired overseas ranged from 48.7% (shigellosis) to 100% (hepatitis E, malaria, typhoid).
  • Over half of hepatitis A, hepatitis E, malaria, paratyphoid, and typhoid cases were linked to travel to the person's country of birth.
  • Hepatitis A vaccination rates were significantly lower in overseas-acquired cases (4.8%) compared to locally-acquired cases (22.2%).

Conclusions:

  • A substantial proportion of selected enteric and vectorborne diseases in NSW are associated with overseas travel.
  • Travellers need awareness of risks and preventive measures, including vaccinations (hepatitis A, typhoid) and precautions (food, water, malaria chemoprophylaxis).
  • Improving data quality on risk factors and preventive measure barriers is essential for enhancing prevention strategies.