✈️ Pre-Travel Health Risk Assessment Questionnaire Simulator

Building the Baseline — Chronic Conditions, Medications, Allergies, and Immunization History

Every pre-travel consultation begins not with the destination but with the traveler. A structured health background intake — chronic disease burden, current medication list, known allergies, pregnancy or breastfeeding status, and prior immunization record — determines which vaccines are safe to give, which prophylactic drugs are contraindicated, and which destinations carry disproportionate risk for this specific individual. Skipping this step is the single most common source of preventable adverse events in travel medicine.

• ~35%: Travelers with ≥1 chronic condition (of international travelers seeking pre-travel care)
• ↑ risk: Immunosuppressed travelers (live vaccines often contraindicated)
• Zika / yellow fever: Pregnancy-related deferrals (destination-specific vaccine caution)
• required: Documented allergy review (before any vaccine or prophylaxis order)

Why the health background gates every later decision

The intake questionnaire captures five linked data domains, each of which changes what is subsequently safe or advisable:

Chronic conditions: • Cardiovascular disease — affects altitude tolerance, air travel fitness, and heat-related illness risk • Diabetes — insulin storage and timing across time zones, foot care in tropical/wet environments • Immunosuppression (biologics, transplant, HIV with low CD4, chemotherapy) — live vaccines (yellow fever, oral typhoid, MMR, varicella) may be contraindicated or require specialist referral • Asplenia — markedly elevated risk from malaria and encapsulated-organism infections; often mandates the most aggressive prophylaxis tier • Chronic respiratory disease — altitude and air-quality exposure counseling

Current medications: • Drug-drug interactions with antimalarials (e.g., mefloquine with certain psychiatric medications, doxycycline with anticoagulants) • QT-prolonging medications interacting with some antimalarial regimens • Immunosuppressive regimens dictating vaccine timing (ideally 4+ weeks before initiating new immunosuppression)

Allergies: • Egg allergy relevant to yellow fever and some influenza vaccines • Prior reaction to a vaccine component (gelatin, neomycin, thimerosal) redirects product selection • Sulfa allergy relevant to some antimalarial and antibiotic choices

Pregnancy and breastfeeding status: • Live vaccines generally deferred in pregnancy • Yellow fever vaccine: risk-benefit discussion required for pregnant travelers to endemic areas • Certain antimalarials preferred (e.g., chloroquine-sensitive regions) or avoided (e.g., some newer agents lack safety data)

Immunization history: • Establishes what is already covered vs. what needs boosting or catch-up • Documented prior yellow fever vaccination is valid for life under current WHO guidance, avoiding unnecessary re-vaccination

A single missed detail — an undisclosed biologic therapy, an egg allergy, a first-trimester pregnancy — can turn a routine travel vaccine visit into an adverse event. The health background stage exists precisely to surface these details before any product is ordered.

Where, When, and How — Destination, Duration, Season, and Accommodation Shape Exposure

Two travelers with identical health backgrounds can face wildly different risk if one spends two weeks in a business hotel in Seoul and the other spends the same two weeks in a rural field station in sub-Saharan Africa. Itinerary detail — precise destinations, trip length, season, urban-vs-rural routing, and accommodation type — is the second pillar of the intake because it determines actual exposure, independent of the traveler's baseline health.

• ↑ malaria & injury risk: Rural/remote travel (vs. urban business travel)
• ↑ cumulative exposure: Trip duration >4 weeks (especially food/water & vector-borne)
• e.g. monsoon: Seasonal variation (shifts mosquito density, flood-related risk)
• screened rooms vs. camping: Accommodation tier (changes vector-avoidance baseline)

Destination-level and micro-itinerary risk factors

A meaningful itinerary assessment goes beyond "country" to capture the specific route:

Destination granularity: • Country-level risk maps (e.g., malaria endemicity, yellow fever zones) are a starting point, not the answer — risk within a single country can vary by altitude, region, and season • Multi-country itineraries require layering risk profiles for every stop, including transit/layover locations if extended

Trip duration: • Short trips (<2 weeks): risk is dominated by acute exposures — food/water, injury, vector bites • Extended trips (>4 weeks) or expatriate assignments: cumulative exposure raises the absolute probability of vaccine-preventable disease, malaria, and TB exposure; chemoprophylaxis choice may shift toward better-tolerated long-term options

Season of travel: • Rainy/monsoon seasons increase mosquito breeding sites and can elevate dengue, malaria, and Japanese encephalitis transmission in some regions • Cold/dry seasons can raise meningococcal meningitis risk in the African meningitis belt • Flooding and monsoon travel raise leptospirosis and food/water contamination risk

Urban vs. rural/remote routing: • Urban business travel: generally lower vector-borne and food/water risk, but higher road-traffic injury exposure in some settings • Rural, remote, or backcountry travel: higher malaria, animal contact, and access-to-care concerns; evacuation planning becomes relevant

Accommodation type: • Air-conditioned, screened hotel rooms reduce mosquito exposure • Camping, open-air lodges, or field housing increase both vector contact and are often correlated with the rural itinerary segments above

Building the itinerary risk tier used downstream

The itinerary intake collapses these variables into a working destination risk tier — Low, Moderate, or High — that is carried forward into the synthesis stage. This tier is not a single lookup value; it reflects the composite of endemic disease maps for the specific route, the season of travel, and the urban/rural mix of planned time. A traveler spending 90% of a trip in a capital-city conference hotel with a two-day rural safari extension is tiered differently than one spending the entire trip in remote villages — even if both technically visit the "same country."

Adventure, Animals, Altitude, and Water — Activities Carry Their Own Counseling Requirements

Itinerary and health background establish the baseline, but planned activities frequently drive the most specific and actionable counseling. Adventure sports, animal contact, altitude exposure, water-based activities, and other high-risk behaviors each map to distinct pre-travel interventions — rabies pre-exposure prophylaxis for animal contact, acetazolamide counseling for altitude, wound care and injury-prevention counseling for adventure sports — that a purely geography-based assessment would not surface.

• rabies PrEP consideration: Animal contact / bites (especially remote areas, limited biologics access)
• AMS risk rises sharply: Altitude >2,500m (acclimatization / prophylaxis counseling)
• schistosomiasis risk: Freshwater contact (in endemic African/Asian/S. American waters)
• ↑ traumatic injury: Adventure sports (leading cause of traveler death/evacuation overall)

Mapping activities to specific pre-travel interventions

Each activity category triggers a distinct counseling and prophylaxis pathway:

Animal contact (wildlife encounters, stray dogs, caving/bat exposure, farm/rural work): • Rabies pre-exposure prophylaxis considered when access to post-exposure biologics at the destination is uncertain, trip duration is long, or contact risk (cycling, running, working with animals) is elevated • Bat exposure and caving raise histoplasmosis and rabies considerations specifically

Altitude exposure (trekking, high-altitude tourism above ~2,500m): • Acute mountain sickness (AMS) risk counseling: ascent rate, acetazolamide prophylaxis candidacy, recognition of red-flag symptoms (HAPE/HACE) • Underlying cardiopulmonary disease from the health-background stage interacts directly with altitude risk tolerance

Water activities (freshwater swimming/wading, whitewater, diving, coastal/marine): • Freshwater contact in schistosomiasis-endemic regions (parts of Africa, South America, Asia, Caribbean) warrants specific avoidance counseling • Diving raises decompression-illness and cardiopulmonary fitness-for-diving considerations, plus interacts with any planned air travel timing • Marine environments raise envenomation and injury considerations distinct from freshwater

Other high-risk behaviors: • Unprotected sexual contact — STI and hepatitis B counseling, PrEP/PEP access planning • Motorbike/scooter use — road-traffic injury is the leading cause of death among healthy travelers abroad; helmet use and local traffic-pattern counseling matter more than most vaccine decisions • Remote trekking without accessible medical evacuation — trip insurance and evacuation planning become part of the "prescription"

Road-traffic injury, not infectious disease, is the leading cause of death in otherwise healthy international travelers. Activity-specific counseling on transportation safety often has a larger expected impact on traveler survival than any single vaccine.

Combining Three Data Streams into a Composite, Domain-Resolved Risk Profile

Health background, itinerary, and activities are each informative on their own, but the clinically useful output is a synthesis: a composite risk score plus a resolved breakdown across five domains — vaccine-preventable disease, malaria, altitude illness, food/water-borne illness, and injury. Synthesis is where interaction effects emerge: a traveler with mild chronic lung disease (health background) trekking at altitude (activity) in a remote high-tier destination (itinerary) carries compounding, not merely additive, risk.

• 0–100: Composite score range (combines chronic burden, tier, activity count)
• Low / Moderate / High: Risk categories (derived thresholds from composite score)
• 5: Domains tracked (vaccine-preventable, malaria, altitude, food/water, injury)
• compounding, not additive: Interaction effects (e.g. chronic lung disease + altitude activity)

How the composite score and domain flags are derived

The synthesis engine in this simulator illustrates — in simplified, illustrative form — how a real risk-synthesis step combines inputs:

Composite score: • Chronic health condition burden contributes a baseline weight reflecting how comorbidity amplifies nearly every downstream risk domain • Destination risk tier contributes the largest single weight, since endemic disease exposure is fundamentally geography-driven • High-risk activity count contributes an independent weight, since activities can elevate specific-domain risk even in an otherwise low-tier destination

Risk category thresholds: • Low: routine, standardized counseling and vaccination pathway is generally sufficient • Moderate: individualized review recommended, additional lead time useful for vaccine series completion • High: priority specialist consultation, often requiring more lead time for multi-dose vaccine series, prescription prophylaxis titration, and evacuation/insurance planning

Domain flagging (illustrative, out of 5 possible domains): • Vaccine-preventable disease — flagged whenever destination tier indicates endemic exposure beyond baseline • Malaria — flagged when destination tier and/or activity pattern (remote/rural exposure) indicate transmission risk • Altitude — flagged when planned activities include substantial high-altitude exposure • Food/water-borne illness — flagged whenever destination tier indicates elevated sanitation-related risk • Injury — flagged when high-risk activities and/or chronic conditions compound trauma or evacuation risk

Each flagged domain becomes a required section in the individualized plan generated in the final stage — nothing flagged is silently dropped.

Synthesis is not simply "add up the risk factors." A traveler with two flagged domains that interact — for example, malaria exposure plus a chronic condition affecting immune response — may warrant a more urgent consultation than the raw domain count alone would suggest.

From Risk Profile to Action List — Vaccines, Prophylaxis, Precautions, and Medical Kit

The entire purpose of the preceding four stages is to generate a concrete, individualized action list — not a generic destination handout. Every flagged domain from the synthesis stage becomes one or more specific action items: a named vaccine with a dosing timeline, a chemoprophylaxis regimen with a start date, a set of behavioral precautions, and a medical kit contents list tailored to trip duration and remoteness.

• 4–6 weeks: Vaccine lead time (ideal window before departure for full series)
• varies by drug: Chemoprophylaxis start (1–2 days to 2–3 weeks pre-departure)
• trip length + remoteness: Medical kit tailoring (basic vs. extended field kit)
• per flagged domain: Action items generated (no flagged domain left unaddressed)

Translating flagged domains into the individualized plan

The plan-generation stage walks the five domain flags from synthesis and produces a corresponding action for each one that is flagged:

Vaccine-preventable disease domain → • Routine vaccine catch-up review (measles, tetanus-diphtheria-pertussis, influenza) • Destination-specific vaccines (e.g., typhoid, hepatitis A, yellow fever where indicated, Japanese encephalitis, rabies pre-exposure where activity risk warrants) • Timeline scheduling that respects the ideal 4–6 week lead time for multi-dose series

Malaria domain → • Chemoprophylaxis regimen selection matched against the health-background medication and allergy review • Start-date and duration counseling (before, during, and after the risk period, drug-dependent) • Bite-avoidance counseling as a co-equal pillar, not a fallback

Altitude domain → • Graded-ascent itinerary counseling • Acetazolamide prophylaxis discussion for candidates • Red-flag symptom recognition and descent-trigger criteria

Food/water-borne illness domain → • Food and water safety behavioral counseling • Standby self-treatment antibiotic prescription for travelers' diarrhea when itinerary/remoteness warrants • Oral rehydration planning

Injury domain → • Road-traffic and activity-specific safety counseling • Travel insurance and medical evacuation coverage verification • Trip-appropriate first-aid kit assembly

Medical kit contents scale with two of the itinerary variables captured earlier — trip duration and remoteness — since a two-day urban trip and a six-week remote expedition warrant categorically different kits even at an identical composite risk score.

The individualized plan is the deliverable the traveler actually leaves with. A risk score without a corresponding action list is an assessment, not a consultation — the entire five-stage framework exists to end at this concrete, personalized checklist.