What Is Hantavirus? Symptoms, Causes, and How It Spreads

What Is Hantavirus?

Hantavirus is a rare infection spread by rodents such as mice and rats. The virus is found in the urine, saliva, and droppings of infected rodents, especially deer mice and other wild rodents. People can become infected by breathing in contaminated dust or by coming into contact with contaminated surfaces.

Hantavirus infection usually begins with flu-like symptoms such as fever, muscle aches, fatigue, and gastrointestinal complaints, followed by sudden respiratory distress and low blood pressure.

How Common Is Hantavirus, and Where Does It Occur?

Hantavirus infections are relatively rare. Globally, an estimated 10,000 to more than 100,000 infections occur each year, with most cases reported in Asia and Europe. The disease was first identified in 1993 when an epidemic resulted in 27 cases in the United States. However, a review of the disease's history reveals cases dating back to 1959.

What Causes Hantavirus Infection in Humans?

• Hantavirus infection in humans is caused by exposure to infected rodents such as deer mice, rats, and other wild rodents.

• The virus is present in rodent urine, saliva, and droppings.

• People usually become infected when they inhale contaminated dust particles released into the air during cleaning of enclosed or rodent-infested areas.

• Infection can also occur by touching contaminated surfaces and then touching the nose or mouth.

How Does Hantavirus Spread to Humans?

• Human hantavirus infections are most common in rural areas such as forests, fields, and farms where rodents carrying the virus can be found. However, transmission can occur in urban areas as well.

• The virus is spread by inhaling rodent droppings, including urine, feces, and saliva. Only certain types of rats and mice can transmit the virus that causes hantavirus pulmonary syndrome (HPS) to humans.

• Individuals are most likely to be exposed to hantaviruses when they work, play, or live in enclosed spaces with an active rodent infestation.

• Human infection does not appear to be specific to age, race, ethnic group, or gender.

What Are the Symptoms of Hantavirus?

After exposure, the incubation period can last anywhere from a few days to six weeks. Infected individuals may experience:

• Headaches.

• Chills.

• Dizziness.

• Myalgia (muscle pain).

• Fever.

• Vomiting.

• Nausea.

• Diarrhea.

• Abdominal pains.

• Hypotension (low blood pressure).

• Severe breathing difficulty.

Who Is Most at Risk of Getting Hantavirus?

Hantavirus is more common in the rural areas of the western United States. Any exposure to rodent habitats can increase the risk of the disease.

Rodent nests, urine, and droppings are commonly found in the following sites:

• Farm buildings.

• Buildings that are rarely used, like storage sheds.

• Seasonal cabins or campers.

• Camping grounds or hiking shelters.

• Basements or attics.

• Areas of construction.

Activities that can increase the risk of hantavirus exposure include:

• Cleaning buildings that have been closed for a long time.

• Cleaning up rodent nests or droppings without taking the necessary precautions

• Working in a field where a person is more likely to encounter rodents, such as construction, utility work, pest control, or farming.

How Is Hantavirus Diagnosed?

• Early diagnosis of hantavirus infection can be difficult because the initial symptoms are similar to other fever-related or respiratory illnesses, such as influenza, COVID-19, viral pneumonia, leptospirosis, dengue, and sepsis.

• A detailed patient history is important, especially regarding possible rodent exposure; occupational and environmental risks, travel history, and contact with known cases in hantavirus-endemic areas.

• Laboratory tests are used to confirm hantavirus infection. Blood tests can detect antibodies produced by the body in response to the virus.

• Doctors may also use reverse transcription polymerase chain reaction (RT-PCR) tests to identify the virus in the blood during the early stage of infection.

How Is Hantavirus Treated?

At present, no approved drugs are available for treating hantavirus infections. The main approach to hantavirus infections involves supportive treatment and careful observation of patients with respiratory, cardiac, and renal problems. Prompt detection and hospital admission could facilitate better recovery for people infected with hantavirus pulmonary syndrome (HPS). Patients are advised to get sufficient rest, stay hydrated, and receive appropriate treatment based on their symptoms.

Common Treatment Options for Hantavirus Infection

• Oxygen treatment for severe respiratory distress.

• Mechanical ventilation to aid breathing when fluid accumulation occurs in the lungs.

• Extracorporeal membrane oxygenation (ECMO) is applied for severe cases to provide temporary support to the heart and lungs.

• Fluid and electrolyte management to maintain blood pressure and prevent fluid buildup in the lungs.

• Dialysis for patients who have developed kidney disorders as a result of HFRS.

• Intensive care for patients with respiratory or cardiac problems.

How Can Hantavirus Be Prevented?

Most people do not become infected after casual contact with rodents. Taking simple precautions and seeking early medical care can greatly reduce the risk.

• Reduce contact with rodents and their urine, saliva, and droppings.

• Prevent rodent infestations in homes, workplaces, and recreational areas by maintaining good hygiene.

• Store food, grains, and garbage properly to prevent rodent infestations.

• Seal holes and gaps in houses to prevent rodents from entering.

• Remove rodent nesting areas around the home and nearby surroundings.

• Follow safety precautions while cleaning rodent-infested areas.

• Use protective equipment such as gloves and masks during cleaning and agricultural work.

• People involved in camping, hiking, and other outdoor activities should avoid contact with rodents and their excreta.

When Should You See a Doctor About Hantavirus Symptoms?

See a doctor immediately if you develop symptoms after contact with rodents or rodent-infested areas.

Symptoms to watch for include:

• Fever or chills.

• Severe tiredness or body aches.

• Headache, nausea, vomiting, or stomach pain.

• Cough or breathing difficulty.

• Chest tightness or shortness of breath.

• Sudden worsening of flu-like symptoms.

• Reduced urination or signs of kidney problems.

Conclusion

Hantavirus infection is uncommon. Since the virus spreads through exposure to infected rodents and their droppings, urine, or saliva, practicing good personal hygiene and preventing rodent infestations are crucial for avoiding hantavirus infection. Fortunately, most people do not develop hantavirus after casual contact with rodents, and simple preventive measures can greatly lower the chances of exposure. The symptoms of hantavirus infection are often similar to those of the flu. Therefore, it is important to see a doctor if symptoms develop after possible contact with rodents or rodent-infested areas.

Key Takeaways

• Hantavirus is a rare infection spread by rodents (such as mice and rats) that can seriously affect the lungs or kidneys.

• People usually get infected through contact with infected rodents or their urine, droppings, or saliva.

• Early hantavirus symptoms often resemble flu-like illnesses and may include fever, fatigue, muscle aches, headache, and nausea.

• Diagnosis is confirmed through blood tests and molecular testing methods such as RT-PCR.

• There is currently no specific vaccine or cure for hantavirus infection. Supportive care, oxygen therapy, intensive care monitoring, and dialysis in severe cases can improve recovery outcomes.

• Preventing rodent infestations and avoiding contact with rodent-contaminated areas are the most effective ways to reduce infection risk.