Important warning

This test is not a medical diagnosis. Hantavirus infection is a rare but extremely dangerous disease: mortality in pulmonary form reaches 35–40%. Early symptoms are almost indistinguishable from the flu. The test is designed for preliminary risk assessment and to help you decide whether to see a doctor.

Read each question carefully and select the answer that best describes your situation over the last 1–7 days (unless otherwise stated). At the end you will receive a total score and interpretation of the results.

Choose a test format

⚡

Brief test

Basic risk assessment based on key symptoms and exposures

20 questions · 3–5 min

🔬

Extended test

Detailed analysis with differential diagnostics

50 questions · 10–15 min

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Useful resources about hantavirus

🌡️

Clinical picture

Hantavirus symptoms

Stages of the disease, differences from flu, and red flags for immediate emergency call.

🦠

Epidemiology

Transmission routes

How infection occurs, who is at risk, and why Andes virus is dangerous.

🛡️

Prevention

How to protect yourself

Safety rules for cleaning, nature activities, and rodent contact.

🔬

Diagnostics

How to detect hantavirus

PCR, serology, rapid tests — what and when to get tested.

📜

History

History of hantavirus

From the Korean War to the Yosemite outbreak — timeline of discoveries and epidemics.

💬

FAQ

Frequently asked questions

Does the test replace a doctor? Can hantavirus spread between people? What to do with a high result?

Question 0 of 20 0%

1Block 1 — Contact with potential source of infection

01Have you been in the last 2–6 weeks to places where rodents might live (country house, shed, basement, attic, camping overnight in a tent, rural area)?

AYes, I cleaned dusty, long‑unused premises where mice might have been, or worked with soil in a rural area.

BYes, I spent time outdoors or in a potentially risky place but without direct contact with dust or nests.

CNo, I haven’t left my city apartment/office or definitely had no contact with rodent habitats.

02Have you noticed mouse droppings, nests, or a strong rodent smell where you stayed (in the last two months)?

AYes, I personally saw droppings, nests, or dead rodents.

BYes, other people said there were rodent traces, or the smell was noticeable.

CNo, I didn’t notice anything like that.

03Do you have an occupational risk (work in agriculture, pest control, forestry, construction in rural areas, or laboratory work)?

AYes, this is my permanent job or I do it regularly.

BOccasionally exposed to such conditions at work.

CNo.

2Block 2 — Symptoms over time (last 1–7 days)

04Have you had a sudden fever above 38°C?

AYes, the temperature rose sharply, above 38.5°C or higher.

BYes, I have a fever but not above 38°C, or it rose gradually.

CNo, temperature is normal.

05Do you experience severe muscle pain (myalgia), especially in large muscles — thighs, back, shoulders?

AYes, very severe, "aching" all over, interferes with movement and sleep.

BMild body ache or pain in one muscle group.

CNo muscle pain.

06Do you have a headache, and if so, what kind?

AVery severe, almost unbearable, may radiate to the eyes (retro‑orbital).

BModerate headache, tolerable, similar to a common cold.

CNo headache.

07Do you notice unusual, rapidly worsening fatigue and weakness that doesn’t go away with rest?

AYes, so severe that I cannot get out of bed, feel dizzy.

BSignificant weakness, worse than with a regular cold.

CNormal mild tiredness or no symptoms.

08Do you have a severe runny nose with profuse watery discharge?

AYes, active runny nose with a lot of discharge.

BMild nasal congestion or light discharge.

CNo, nasal breathing is free.

09Do you have a sore throat when swallowing?

AYes, severe pain, red throat, possible exudate.

BMild scratchiness or discomfort.

CNo, throat doesn’t hurt.

10Do you have nausea, vomiting, or abdominal pain?

AYes, pronounced nausea, vomiting and/or abdominal pain.

BMild nausea or abdominal discomfort.

CNo.

11Do you have shortness of breath (feeling of lack of air) at rest or with minimal exertion?

AYes, I am suffocating, even when sitting or talking — cannot lie down. ⚠ Call emergency immediately!

BNoticeable shortness of breath when walking around the room or talking.

CNo, breathing normally or only with heavy exertion.

12Do you have pain or aching discomfort in the lower back (kidney area)?

AYes, lower back pain on one or both sides, appeared together with other symptoms.

BMild back discomfort, but I associate it with physical activity.

CNo.

13How quickly did your symptoms develop?

AVery fast: I was healthy in the morning, by evening fever, chills, severe body aches, and condition worsening.

BGradual: mild malaise first, fever the next day, etc.

CSymptoms have not changed much for several days.

3Block 3 — Contact with people and other factors

14Have you been in contact with a person who has confirmed hantavirus or severe rapidly progressing pneumonia after returning from endemic regions?

AYes, close contact with such a person (especially from Argentina/Chile — Andes virus).

BHeard about such cases in my surroundings but had no personal contact.

CNo, nothing like that.

15Have you traveled in the last 2–6 weeks to South America (especially Patagonia, Argentina, Chile) or other endemic regions (Asia, Far East)?

AYes, traveled to South America / Asia / Far East.

BYes, traveled to other regions.

CNo.

16Is anyone in your household or colleagues ill with similar symptoms?

AYes, several people around me got sick at the same time with similar symptoms.

BYes, but everyone has different symptoms.

CNo, everyone around is healthy.

4Block 4 — Current condition and warning signs

17What is your blood pressure (if measured in the last 24 hours)?

AIt is significantly lower than my normal (e.g., was 120/80, now 90/60 or lower).

BBlood pressure is normal or slightly elevated.

CI don’t know / haven’t measured.

18Do you have chronic diseases (diabetes, hypertension, asthma, kidney disease) or conditions that weaken the immune system?

AYes, I have serious chronic diseases.

BI have mild chronic health issues.

CNo, I am generally healthy.

19Have you taken paracetamol or ibuprofen in the last few days, and did it help reduce fever and pain?

AYes, I took them, but they hardly helped — fever and pain persist.

BYes, the medication helped, I feel much better.

CNo, I haven’t taken anything.

20How would you generally rate your current condition?

AVery severe: cannot get out of bed, difficulty breathing, confused consciousness, irregular heartbeat. ⚠ CALL EMERGENCY IMMEDIATELY!

BModerate: significant fever, weakness, but I can move around and care for myself.

CSatisfactory: mild malaise, runny nose, but I can function.

1 / 20

Questions

Answer all 20 questions to get your result

Question 0 of 50 0%

1Block 1 — Epidemiological history (10 questions)

01Have you visited rural areas, a country house, forest, basement, attic, or other rodent habitats in the last 2–6 weeks?

AYes, and actively contacted dust (sweeping, sorting old things, working with soil, camping overnight).

BYes, but just stayed in such a place, no dust‑related work.

CNo, I haven’t left my city apartment/office or definitely had no contact with such places.

02Have you personally seen mouse droppings, nests, dead rodents in the place you stayed (in the last 2 months)?

AYes, saw fresh droppings, nests, or dead mice.

BSaw old traces, or someone told me they were there.

CNo, nothing like that.

03Did you inhale dust while cleaning long‑unused premises, sheds, basements (within the last 6 weeks)?

AYes, I felt dust inhalation, it was dusty, possibly without a mask.

BNo, cleaning was wet or I used a respirator.

CI didn’t do such cleaning.

04Have you had direct contact with live rodents or their excreta (handling them, cleaning a cage)?

AYes, close contact with live wild or pet rodents.

BOccasional brief contact.

CNo.

05Do you work in agriculture, forestry, pest control, construction in rural areas, or a laboratory with hantaviruses?

AYes, this is my permanent job.

BI sometimes perform such work.

CNo.

06Have you been in the last 2–6 weeks to regions endemic for hantaviruses (Russian Far East, Ural, Volga region, Argentina, Chile, USA — Four Corners states, China, Korea)?

AYes, I was in such a region.

BTraveled to other regions.

CNo.

07Have you taken part in outdoor activities with overnight stays in a tent or cabins in forests/mountains in the last 6 weeks?

AYes, stayed overnight in a tent or forest cabin.

BYes, but stayed in a well‑equipped hotel.

CNo.

08Do you know of any cases of hantavirus infection among acquaintances, neighbors, or in your area in the last 2 months?

AYes, a confirmed human case.

BHeard about cases in animals (mice) but not in humans.

CNo.

09Have you been in contact with a person who had confirmed hantavirus infection or severe rapidly progressing pneumonia of unknown origin (especially after returning from endemic zones)?

AYes, close household contact (especially with a patient from Argentina/Chile — Andes virus).

BCasual contact or staying in the same room.

CNo.

10Has anyone in your circle died of rapidly developing respiratory failure or pulmonary edema of unknown origin in the last month?

AYes, and it happened after flu‑like symptoms.

BYes, but the cause is clear (e.g., cancer, trauma).

CNo.

2Block 2 — Initial phase symptoms (10 questions)

11How did the illness start?

ASuddenly, from full health: sharp fever, chills, severe weakness.

BGradually: mild malaise first, then fever.

CNo fever, only fatigue.

12What is your maximum body temperature in the last 24 hours?

AAbove 39°C, poorly responsive to antipyretics.

B38–39°C.

C37–38°C.

DNormal (below 37°C).

13Do you have chills, shaking, feeling cold with high fever?

AYes, pronounced chills, "teeth chattering".

BMild shivering.

CNo.

14How severe is muscle pain (myalgia)?

AVery severe: large muscles hurt (back, thighs, calves), cannot find a comfortable position.

BModerate body aches, like with flu.

CMild discomfort.

DNo muscle pain.

15Where is the headache located?

AMainly in the forehead and eyes (retro‑orbital), throbbing, worsens with eye movement.

BDiffuse, moderate, squeezing "helmet".

CNo headache.

16Do you have pain or burning in the eyes, photophobia?

AYes, eyes hurt, watering, uncomfortable looking at light.

BMild dryness or tiredness.

CNo.

17How severe is general weakness and fatigue?

AExtreme: cannot get out of bed, dizzy.

BSevere, but I can move around the house.

CMild fatigue, like after a workday.

18Have you had nausea and/or vomiting in the first days of illness?

AYes, constant nausea, vomiting occurred.

BMild nausea, no vomiting.

CNo.

19Do you feel pain or discomfort in the abdomen?

AYes, fairly severe pain, sometimes cramping, may be accompanied by diarrhea.

BMild discomfort.

CNo.

20How do you rate your sweating during the illness?

AProfuse, drenching sweats, especially at night.

BModerate sweating when fever subsides.

CNormal.

3Block 3 — Respiratory and cardiovascular manifestations (10 questions)

21Do you have shortness of breath (feeling of lack of air) at rest?

AYes, marked shortness of breath, I cannot lie down, must sit. ⚠ Urgent medical help!

BMild shortness of breath when talking or with minimal exertion.

CShortness of breath only with physical activity.

DNo shortness of breath.

22What is your resting respiratory rate per minute? (count for 30 seconds and multiply by 2)

AMore than 25 breaths/min.

B20–25 breaths/min.

CLess than 20 breaths/min.

DCannot count / don’t know.

23Have you developed a cough? If yes, what kind?

ADry, hacking, without phlegm.

BCough with frothy or pink sputum (hemoptysis). ⚠ Call emergency immediately!

CWet cough with usual (yellow/green) sputum.

DNo cough.

24Do you feel chest tightness or pain when breathing?

AYes, pain worsens on inhalation, feeling of fullness in the chest.

BMild tightness, but not pain.

CNo.

25Have you measured your oxygen saturation (SpO₂) with a pulse oximeter?

AYes, SpO₂ below 90%. ⚠ Call emergency immediately!

BYes, SpO₂ 90–94%.

CYes, SpO₂ 95% or higher.

DNot measured.

26Do you notice bluish lips, nails, or skin (cyanosis)?

AYes, lips or nails have a bluish tint. ⚠ Call emergency immediately!

BSlightly pale or grayish skin.

CNo, skin is normal color.

27Do you feel palpitations, irregular heartbeats?

AYes, heart pounds, tachycardia (resting pulse >100).

BMild increased pulse (80–100).

CNormal pulse.

28What is your blood pressure (if measured)?

ASignificantly low (below 90/60 if your normal is higher).

BModerately low or normal.

CHigh.

DNot measured.

29Do you feel short of breath when lying on your back, forcing you to sit up?

AYes, I cannot lie flat, only sitting or semi‑reclined. ⚠ Urgent help!

BMild discomfort, but I can lie down.

CNo, I sleep in a normal position.

30Do you have wheezing or whistling sounds when breathing, audible at a distance?

AYes, I hear whistling or gurgling sounds on exhalation/inhalation.

BOnly mild chest congestion.

CNo.

4Block 4 — Hematologic, renal, and hemorrhagic signs (10 questions)

31Have you noticed bleeding gums when brushing teeth or bruising without cause in the last few days?

AYes, marked bleeding, large bruises.

BMild bleeding, one or two small bruises.

CNo.

32Do you have petechiae — small red or purple dots on the skin (like a rash that does not fade with pressure)?

AYes, many dots on the trunk, arms, mucous membranes.

BA few spots, resembling vascular stars.

CNo.

33Have you had nosebleeds during the illness?

AYes, repeatedly, difficult to stop.

BOnce, minor.

CNo.

34How has your urine output changed in the last 24 hours?

ASignificantly less urine, sometimes only a few drops, or I haven’t urinated in 6–8 hours.

BLess urine than usual, but I still urinated.

CUrine output unchanged.

DI don’t monitor / don’t know.

35What is the color of your urine?

ADark, “cola”‑colored, cloudy, with blood.

BConcentrated, dark yellow.

CNormal color.

36Do you have pain in the lower back or kidney area?

AYes, dull, aching pain on one or both sides.

BMild discomfort after physical activity.

CNo.

37Have you developed swelling of the face, eyelids, or legs (especially in the morning)?

AYes, noticeable facial puffiness, "bags" under eyes, swollen feet.

BMild morning pastiness.

CNo.

38Have you had a complete blood count in recent days? (platelets and hematocrit)

AYes, platelets low (below 150×10⁹/L), hematocrit high (above 50% in men, above 45% in women).

BYes, minor deviations (platelets at lower normal limit, hematocrit slightly elevated).

CYes, all values normal.

DNot taken.

39Have you been tested for hantavirus (PCR or IgM antibodies)?

AYes, positive result. ⚠ See a doctor immediately if you haven’t yet!

BYes, negative result.

CNo.

40How fast is your condition worsening?

AVery fast: getting worse every hour, increasing shortness of breath or weakness.

BSlowly but noticeably worsening day by day.

CNo change or improving.

5Block 5 — Differential diagnosis and general condition (10 questions)

41Do you have a sore throat when swallowing?

AYes, severe pain, red throat, exudate.

BMild scratchiness, discomfort.

CNo.

42Do you have a marked runny nose with profuse watery discharge and/or sneezing?

AYes, a lot of nasal discharge, frequent sneezing.

BMild nasal congestion.

CNo, nasal breathing is free.

43Do you notice enlargement or tenderness of the cervical, submandibular lymph nodes?

AYes, nodes enlarged and painful.

BMild enlargement, painless.

CNo.

44Do you have a rash of a different nature (maculopapular, urticarial, vesicular)?

AYes, abundant rash all over the body.

BMinor eruptions.

CNo.

45Do you have joint pain (arthralgia) without swelling?

AYes, several joints hurt badly (knees, hands).

BMild stiffness.

CNo.

46In the last 3–7 days, have you been in contact with a person who had confirmed flu, COVID‑19, or ARVI?

AYes, close contact with a person who had lab‑confirmed flu/COVID.

BYes, contacted a person with a cold.

CNo.

47Have you taken antibiotics or antiviral drugs, and did they help?

AYes, took antibiotics but condition did not improve or worsened.

BYes, took antivirals (against flu/COVID), felt better.

CNo.

48Do you have chronic diseases (diabetes, hypertension, kidney/lung/liver disease, immunodeficiency)?

AYes, and they may affect symptoms.

BI have mild chronic issues.

CNo.

49Do you smoke or have you smoked for a long time?

AYes, long‑term smoking, smoker’s cough.

BQuit smoking.

CI don’t smoke.

50How would you generally rate your condition right now?

ASevere: marked shortness of breath, confusion, low blood pressure. ⚠ CALL EMERGENCY IMMEDIATELY (911 / 112)!

BModerate: fever, weakness, but conscious and able to move.

CSatisfactory: symptoms present, but I can care for myself.

DGood, nothing bothers me.

1 / 50

Questions

Answer all 50 questions to get your result

This test is a preliminary risk assessment tool, not a substitute for laboratory diagnostics or a doctor’s examination. Even with a low score, if you have acute shortness of breath, hemoptysis, or loss of consciousness, call emergency services immediately. Take care.

Learn more about hantavirus

🌡️

Clinical picture

Hantavirus symptoms

Stages of the disease, differences from flu, red flags.

🦠

Epidemiology

Transmission routes

How infection occurs, who is at risk, why Andes is dangerous.

🛡️

Prevention

How to protect yourself