Episode Details

Guest: Professor Nicholas Zwar, Executive Dean of Medicine at Bond University, experienced GP, and Chair of the RACGP Travel Medicine Specific Interest Group.

Episode Summary With international travel rebounding to pre-pandemic levels, GPs remain the primary source of travel health advice for 80-90% of prospective travelers. In this episode, Professor Nicholas Zwar provides a comprehensive update on conducting efficient pre-travel consultations, navigating emerging infectious disease risks, and prioritizing immunizations for diverse patient populations.

Key Topics Discussed:

• Structuring the Pre-Travel Consult: Professor Zwar recommends using the "Three Ts" framework to efficiently assess risk:
• The Traveler: Assessing age, chronic medical conditions, immunocompromise, and current medications (such as gastric acid suppressants which increase susceptibility to food and water-borne diseases).
• The Trip: Evaluating destination, accommodation style (e.g., air-conditioned vs. screened), and risk activities.
• The Time: Accounting for seasonal risks, like the wet season increasing mosquito-borne disease exposure.
• Emerging and Shifting Infectious Risks:
• Dengue Fever: Incidence is rising globally, and while vaccines are in development or available via special access, they remain challenging to implement due to paradoxical severe infection risks with different serotypes.
• Japanese Encephalitis (JE): JE has now established itself within Australia's feral pig population via waterbirds.
• Measles & Polio: Global resurgences of measles and vaccine-derived polio make routine immunization checks critical.
• Malaria Prophylaxis for Multi-Drug Resistant Regions: For regions with chloroquine resistance, options primarily include atovaquone/proguanil (started 2 days prior, continued for 1 week after) or doxycycline (continued for 4 weeks post-travel). Mefloquine is less favored due to neuropsychiatric side effects, and tafenoquine requires prior G6PD deficiency testing.
• The "Three Rs" of Immunization: Categorizing vaccines as Routine (e.g., catching up on MMR or Hep B), Required (e.g., Yellow Fever for certain South American/African borders, Meningococcal for the Hajj), and Recommended (based on specific trip risks like Hep A, Typhoid, and Rabies).

Clinical Pearls for GPs:

• Visiting Friends and Relatives (VFRs) are high-risk: Immigrants returning to their home countries often mistakenly believe they retain immunity to diseases like malaria. In reality, partial cellular immunity to malaria disappears after just 9 to 12 months away from an endemic area.
• Hepatitis A vaccination is rapid and reliable: A single dose of the Hep A vaccine provides high efficacy even if administered as the patient is literally "walking out the door to the airport," protecting them for about two years. Completing the two-dose schedule provides lifelong immunity regardless of the interval length, provided it is more than six months apart.
• Rabies pre-exposure prophylaxis simplifies care: Offering a modern two-dose IM rabies pre-exposure vaccine course is often recommended for travelers heading to higher-risk areas. If bitten, pre-vaccinated patients only need two post-exposure vaccine doses and avoid the complex, often unavailable, requirement for Human Rabies Immunoglobulin.
• Caution with Yellow Fever vaccine in older patients: As a live attenuated vaccine, administering Yellow Fever to a first-time recipient over age 65 carries a higher risk of severe