CDC – Hantavirus Pulmonary Syndrome (HPS) – Hanta virus

CDC – Hantavirus Pulmonary Syndrome (HPS) – Hanta virus

Hantaviruses are a family of viruses spread mainly by rodents and can cause varied disease syndromes in people worldwide.  Infection with any hantavirus can produce hantavirus disease in people. Hantaviruses in the Americas are known as “New World” hantaviruses and may cause hantavirus pulmonary syndrome (HPS). Other hantaviruses, known as “Old World” hantaviruses, are found mostly in Europe and Asia and may cause hemorrhagic fever with renal syndrome (HFRS).

Each hantavirus serotype has a specific rodent host species and is spread to people via an aerosolized virus that is shed in urine, feces, and saliva, and less frequently by a bite from an infected host. The most important hantavirus in the United States that can cause HPS is the Sin Nombre virus, spread by the deer mouse.

Hantavirus pulmonary syndrome (HPS) facts

  • Hantaviruses are RNA viruses transmitted to humans by rodents (rodent-borne).
  • Hantavirus pulmonary syndrome (HPS) is a disease in which, in the late stage of infection with a hantavirus subtype, patients experience lung congestion, fluid accumulation in the lungs, and shortness of breath. Early symptoms (fatiguefever, muscle aches) are nonspecific. In addition, some hantaviruses can cause hemorrhagic fever with renal syndrome (HFRS) as the disease progresses.
  • Health officials first identified hantavirus in an outbreak in 1993 in the “Four Corners” area of the southwestern U.S. Hantavirus spreads to humans by rodent urine, feces, saliva, and by airborne particles containing these items. The 2012 outbreak at Yosemite National Park was due to hantavirus transfer to humans by deer mice. Human-to-human transmission of hantavirus in the Americas has not been documented.
  • Hantavirus is not contagious (in North America).
  • In South America, some investigators suggest hantavirus there may be contagious.
  • The incubation period for hantavirus is about one to five weeks.
  • About 38% of hantavirus infections are lethal (mortality rate); specialists usually care for infected patients.
  • HPS is caused by hantaviruses that cause lung capillaries to leak fluid into the lung tissue.
  • Physicians usually diagnose HPS presumptively by the patient’s lung symptoms or the patient’s association with rodents or the patient’s probable contact with rodent-contaminated airborne dust; chest X-rays provide additional evidence, but definitive diagnosis is usually done at a specialized lab or the U.S. Centers for Disease Control and Prevention (CDC).
  • There is no specific treatment of HPS; doctors usually treat patients in an intensive care facility and often require respiratory support (intubation and mechanical ventilation).
  • Risk factors are any association with rodents and their airborne body excretions.
  • If the HPS patient survives, there are usually no long-term complications.
  • Prevention of HPS centers on avoidance of rodent contamination; there is no vaccine available to prevent hantavirus infection or HPS.
Picture of Sin Nombre hantavirus particles

Figure 1: Picture of Sin Nombre hantavirus particles; SOURCE: CDC/D. Loren Ketai, MD

Chest X-ray of a patient with hantavirus pulmonary syndrome (HPS)

Figure 2: Chest X-ray of a patient with hantavirus pulmonary syndrome (HPS); SOURCE: CDC/Brian W.J. Mahy, PhD; Luanne H. Elliott, MS

Symptoms of Hantavirus

Flu-like Symptoms

The flu (influenza) is a viral disease of the respiratory tract. Characteristic symptoms are

  • fever,
  • chills,
  • cough,
  • malaise, and
  • headache.

Other symptoms can occur, like

  • nausea and vomiting,
  • muscle or body aches,
  • tiredness and fatigue,
  • appetite loss,
  • sore throat, and
  • diarrhea.

Read about other flu symptoms »

What is hantavirus? What is hantavirus pulmonary syndrome (HPS)?

The term hantavirus represents several groups of RNA-containing viruses (that are members of the virus family of Bunyaviridae) that are carried by rodents and can cause severe respiratory infections termed hantavirus pulmonary syndrome (HPS) and hemorrhagic fever with renal syndrome (HFRS).

HPS is found mainly in the Americas (Canada, U.S., Argentina, Brazil, Chile, Panama, and others) while HFRS is found mainly in Russia, China, and Korea but may be found in Scandinavia and Western Europe and occasionally in other areas. Like HPS, HFRS results from hantaviruses that are transmitted by rodent urine, rodent droppings, or saliva (rodent bite), by direct contact with the animals, or by aerosolized dust contaminated with rodent urine or feces to human skin breaks or to mucous membranes of the mouth, nose, or eyes. The vast majority of HPS and HFRS infections do not transfer from person to person.

The goal of this article is to discuss HPS; however, much of what is presented about HPS applies to HFRS — the main difference is that the predominant symptoms in the late stages of disease vary somewhat between the two diseases (lung fluid and shortness of breath in HPS and low blood pressure, fever, and kidney failure in HFRS).

HPS is a disease caused by hantavirus that results in human lungs filling with fluid (pulmonary edema) and causing death in about 38% of all infected patients.IMAGESHantavirusSee pictures of Bacterial Skin ConditionsSee Images

What is the history of hantavirus pulmonary syndrome?

In 1993, health officials noted the first recognized outbreak of HPS in the “Four Corners” area of the U.S., where the states of Arizona, New Mexico, Colorado, and Utah meet. Two otherwise healthy young people, a Navajo Indian, and his fiancée, suddenly became short of breath and died. This unusual situation triggered a review of deaths in the four states that resulted in the identification of five other young people who recently died with similar breathing problems. During the next few weeks, health care providers treated additional people in the same geographic area with similar pulmonary syndromes. Tissues from affected patients were sent to the CDC, where researchers searched for causes and found a link among the patients: infection with a previously unknown type of hantavirus. Since other known hantaviruses (in Asia and Europe) were known to be transmitted to people by rodents, the researchers started trapping rodents from June to August 1993 to determine if the virus was associated with the animals. In November 1993, a rodent (a deer mouse) trapped by CDC researchers in a house where a person who developed the pulmonary syndrome lived yielded the previously unknown virus. In addition, army researchers soon isolated the same virus from an infected patient who also had exposures to mice. This new hantavirus was first termed Muerto Canyon virus, then Sin Nombre virus (SNV), and eventually simply hantavirus. The disease caused by this virus was termed hantavirus pulmonary syndrome (HPS). Further investigations suggested that other people had died from this infection in the past, as autopsy tissue contained the virus. When health researchers studied Navajo Indian medical traditions, the Navajo medical culture apparently recognized the disease and had associated it with mice. The outbreak in 1993 probably occurred because environmental factors led to favorable survival and proliferation of mice. The mouse population was about tenfold greater in 1993 than in 1992 in the Four Corners area.

A large, more recent outbreak of HPS occurred at Yosemite National Park, Calif., in 2012. The outbreak was linked to deer mouse dropping contamination in campsites (tent-cabins) used by tourists. This zoonotic (animal-to-person) transmission probably happened with a rodent infestation augmented by favorable nesting conditions like woodpiles in or near the campsites. At least three deaths occurred, and seven other infected people recovered.

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What causes hantavirus pulmonary syndrome?

As stated above, the cause of HPS is an infection of the patient by hantavirus. Currently, about 14 subtypes of hantaviruses have been identified. Many subtypes have been named (for example, Sin Nombre, Black Creek hantavirus, Seoul virus, and New York hantavirus); some investigators simply lump them under the term of “New World hantaviruses.” The Sin Nombre subtype has caused the majority of current HPS disease. The virus apparently damages cells that compose blood vessel capillaries, causing them to leak fluids. This fluid leak, if it is profound in the lungs, causes life-threatening pulmonary syndrome.

Hantaviruses live their lifecycle in rodents but apparently do no harm; the viruses multiply and shed in the rodent’s urine, feces, and saliva. A recent study in California suggested about 15% of all deer mice examined tested positive for hantavirus. Although the deer mouse has been the source of most HPS infections, many other rodents may carry a different hantavirus subtype virus (for example, the white-footed mouse, the cotton rat, and the rice rat).

What are risk factors for hantavirus pulmonary syndrome?

The major risk factor for HPS is an association with a rodent infestation, their saliva, urine, or feces or with dust, dirt, or surfaces contaminated with such items, either by direct contact or by aerosol. Barns, sheds, homes, or buildings easily entered by rodents (for example, deer mouse or Peromyscus maniculatus) are potential places for hantaviruses to come in contact with humans. Rural areas that have forests and fields that can support a large rodent population are areas that increase the risk of exposure to HPS. Camping and hiking in areas known to have a high rodent population and occupying areas where rodents may seek shelter increase one’s risk. Those who work in areas that may be a shelter for rodents (for example, crawl spaces, vacated buildings, construction sites) may also have an increased risk of HPS. The risk is higher in people who work in areas known to have produced HPS infections.SLIDESHOWViral Infection Types, Treatment, and PreventionSee Slideshow

Is hantavirus contagious?

Hantavirus is not contagious from person to person. The virus spreads from rodents to humans. Although outbreaks seem like there is a person-to-person transfer, outbreaks are usually noted among groups of people exposed to the same infected rodent population; but those with hantavirus infections do not transfer them to other uninfected individuals. While this is the situation in North America, there are reports that in 1996, mild infections with hantaviruses were transmissible in an outbreak in Argentina. However, to date, there has been no reported person-to-person transfer of the virus in the United States. Small outbreaks are reported each year; for example, Texas had its first individual diagnosed with hantavirus in 2015.

How long is hantavirus contagious?

In North America, there is no evidence that hantavirus is contagious. In South America, an estimated 16-35 days was the contagious period for a rare few patients who investigators considered to have exhibited person-to-person transfer with a type of hantavirus termed Andes virus.

What is the incubation period for hantavirus?

According to the CDC, in North America, the incubation period (time from initial exposure to the virus and development of the first symptoms) is between one to five weeks after initial exposure to infected rodent urine, droppings, or saliva. In South American outbreaks, researchers estimate that the incubation period varies from about 12-27 days.

What are hantavirus pulmonary syndrome symptoms and signs?

The symptoms and signs of HPS fall into early and late stages. Early HPS signs and symptoms begin about one to five weeks after the person contacts the hantavirus associated with rodent urine, feces, or saliva. The early symptoms are flu-like, last about four to 10 days, and include the following:

  • Fatigue
  • Fever
  • Muscle aches (especially large muscles in the legs, back, and hips)

Almost every infected person develops these symptoms. Other symptoms that may occur in about half of infected patients include abdominal pain (with nauseavomiting, and diarrhea), headacheschills, and dizziness. Early symptoms can cause diagnostic confusion. In 2018, Kiley Lane, a 27-year-old mother who lived in New Mexico, was diagnosed as having the flu but her symptoms got worse; she was diagnosed with having hantavirus about a month after her flu diagnosis and died about one month later of the disease.

Late symptoms of HPS symptoms occur about four to 10 days after the early symptoms and include coughing, chest pain, and shortness of breath that can become severe. Some infected people may develop a hemorrhagic fever and kidney failure that may require dialysis (HFRS or hemorrhagic fever with renal syndrome).

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