Short answer
Testing, isolation, quarantine, and monitoring for hantavirus are clinical and public-health decisions. If you have been contacted by public-health officials about potential Andes virus exposure, follow their specific instructions. If you develop symptoms after exposure, contact a healthcare provider immediately and describe the exposure history.
When hantavirus testing is considered
Hantavirus testing is considered when a patient has compatible symptoms — fever, muscle aches, respiratory symptoms — combined with an exposure history that makes hantavirus plausible. CDC HAN guidance directs clinicians to coordinate with state or local health departments about specimen collection, since hantavirus testing is not a standard automated laboratory test and is not available at all facilities. Testing should not delay supportive care or ICU admission in a critically ill patient.
Diagnostic methods
Primary diagnostic approaches for HPS include ELISA-based serologic testing for IgM and IgG antibodies and RT-PCR. Serologic tests may give negative results very early in illness when antibody levels are still rising, so repeat testing after several days may be needed if clinical suspicion remains. CDC Emergency Operations Center and state public-health laboratories coordinate testing for suspected hantavirus cases.
Isolation guidance for suspected cases
For suspected Andes virus cases, WHO and CDC recommend standard precautions plus contact and droplet precautions, reflecting the close-contact rather than airborne transmission characteristics of the virus. Patients should inform healthcare providers about Andes virus exposure history so appropriate precautions are in place from first clinical contact. For hantavirus strains other than Andes virus, person-to-person spread has not been documented, so routine contact or droplet precautions do not apply in the same way.
High-risk contact monitoring
WHO DON601 recommends active monitoring and home or facility quarantine for high-risk contacts of confirmed Andes virus cases for 42 days from the last exposure. High-risk contacts include household members, intimate partners, and people with prolonged close indoor exposure during the symptomatic period. Active monitoring means daily symptom checks and immediate clinical evaluation if any symptoms appear. Public-health officials identify and contact individuals who meet these criteria.
Low-risk contact self-monitoring
WHO describes lower-risk contacts — including people with brief or indirect exposure — as self-monitoring for symptoms without required quarantine. These contacts should seek clinical evaluation if symptoms develop and should disclose the exposure history to their healthcare provider. Public-health authorities conducting contact investigations use passenger manifests, seating records, and activity logs to identify and tier contacts appropriately.
U.S. current situation context
CDC's current situation page states that no Andes virus cases have been confirmed in the United States as a result of the MV Hondius outbreak and that exposed passengers are being monitored by public-health officials. U.S. passengers who have been contacted by CDC or state health departments should follow those instructions. U.S. residents with Andes virus exposure questions who have not been contacted by health authorities can reach CDC's Emergency Operations Center via state and local health department referral.
For exposed individuals
This site does not provide individual testing, isolation, or quarantine determinations. People contacted by public-health officials should follow those instructions. People who have not been contacted but are concerned about a potential exposure should contact their healthcare provider or state and local health department and describe the exposure history in detail — when, where, and what type of contact occurred.
Sources reviewed for this page
Frequently asked questions
Can contacts be routinely tested to clear monitoring early?
WHO DON601 states that current evidence does not support routine laboratory testing of contacts for outbreak control purposes. A negative early test does not reliably clear someone from monitoring because antibodies may not yet be detectable. Monitoring continues for the full window specified by public-health authorities regardless of early test results.
Who handles testing questions for exposed individuals?
CDC HAN guidance directs clinicians and individuals with testing questions to coordinate through state or local health departments, or through CDC's Emergency Operations Center. Testing for hantavirus is not available at all facilities and requires laboratory coordination. This site does not facilitate testing referrals.
What is the difference between isolation and quarantine in this context?
Isolation applies to people who are sick and confirmed or suspected to have an infectious illness. Quarantine applies to people who have been exposed but are not yet symptomatic. For Andes virus, WHO recommends quarantine for high-risk contacts for 42 days from last exposure and isolation for confirmed or suspected cases with standard plus contact and droplet precautions.
What should a brief transit exposure on a ship require?
Brief transit exposure — passing through shared spaces without prolonged close contact — is generally classified as lower-risk by official guidance. Lower-risk contacts self-monitor for symptoms without required quarantine. Public-health authorities conducting contact investigations use manifests and activity records to tier contacts based on actual proximity and duration. This site cannot classify individual exposures.
What should I expect if I am hospitalized for suspected HPS?
Hospital management of suspected HPS focuses on supportive care and monitoring for cardiopulmonary deterioration. For Andes virus, contact and droplet precautions are used. Diagnostic testing involves serologic blood tests and RT-PCR. ICU admission and mechanical ventilation support may be needed in severe cases. Official clinical guidance for HPS is available through CDC's clinical overview.
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Report a correctionPrimary sources reviewed
CDC, WHO, and ECDC official public-health pages were reviewed for this build. Current outbreak counts use official outbreak updates; evergreen pages use official background and guidance pages.