Hantavirus Symptoms

Short answer

Early hantavirus symptoms can closely resemble flu, COVID-19, and other viral illnesses. Official sources describe fever, fatigue, muscle aches, headache, dizziness, chills, nausea, vomiting, diarrhea, or abdominal pain as early signs, with later respiratory symptoms requiring urgent care. Exposure history is essential: symptoms alone do not identify hantavirus, and clinicians use the combination of symptoms and rodent or close-contact exposure to guide testing and care.

Early phase symptoms

The early phase of hantavirus infection typically begins one to eight weeks after exposure to infected rodent materials. Symptoms at this stage are nonspecific and may include fever, severe fatigue, muscle aches especially in large muscle groups, headache, chills, and dizziness. Many patients also experience gastrointestinal symptoms such as nausea, vomiting, diarrhea, and abdominal pain. Because these symptoms overlap with many other illnesses, early diagnosis requires knowledge of recent rodent exposure or contact with a symptomatic Andes virus case.

During this phase, most patients are ambulatory and may attribute symptoms to a routine illness. This is why exposure history is so important: a clinician who knows about recent rodent contact or potential Andes virus exposure can test and monitor appropriately. See the hantavirus symptoms timeline for more detail on timing.

Progression to respiratory symptoms

Within four to ten days of symptom onset, hantavirus infection can progress from the flu-like phase to pulmonary involvement. Patients may develop a cough and increasingly severe shortness of breath. This transition marks a critical change: respiratory symptoms indicate the disease is advancing toward serious pulmonary disease and require immediate medical attention. Official sources describe this phase as requiring hospital evaluation and care.

The appearance of respiratory symptoms should not be managed at home. CDC and WHO guidance emphasize that early hospitalization and intensive monitoring are associated with better outcomes. Do not wait to see if respiratory symptoms resolve on their own.

Emergency warning signs

Seek emergency care immediately if you experience any of the following after potential hantavirus exposure:

• Severe shortness of breath or difficulty breathing
• Chest tightness or chest pain
• Confusion or altered mental status
• Fainting or near-fainting
• Blue lips or fingernails
• Rapidly worsening illness after initial flu-like symptoms

Call emergency services or go to the nearest emergency department immediately. Tell medical staff about any rodent exposure or contact with a person who had confirmed or suspected Andes virus infection.

Exposure history is essential

Official sources are consistent that symptoms alone cannot diagnose hantavirus. Clinicians and public-health authorities consider the full picture: symptom timing, known or suspected rodent exposure, travel to areas where Andes virus is present, and whether the person has been in close contact with a symptomatic Andes virus case. The hantavirus incubation period page explains why symptoms can appear weeks after exposure.

If you develop symptoms and have had recent rodent exposure or close contact with a suspected Andes virus case, tell healthcare providers about the exposure history immediately. This information directly affects whether and how testing is performed.

Andes virus symptoms

Andes virus causes hantavirus pulmonary syndrome with the same symptom pattern as other HPS-causing strains: early flu-like symptoms followed by possible respiratory progression. It is the only hantavirus known to spread person-to-person through close contact with a sick person. The Andes virus person-to-person spread and how hantavirus spreads pages explain close-contact precautions in detail.

What official sources do and do not say

Official sources describe population-level symptom patterns and guidance. They do not let this site diagnose an individual, clear an exposure, assign individual risk, or replace clinical evaluation. This page compiles information from CDC, WHO, and state health sources and includes source links below.

Sources reviewed for this page

• CDC hantavirus about
• CDC HPS clinical overview
• WHO hantavirus fact sheet
• CDC Andes virus