Even as the coronavirus outbreak takes the world by storm, a number of other diseases are also rearing their ugly heads. Cases of swine flu and bird flu have already been reported in India and other countries. Now, a man from China has tested positive for hantavirus.
China’s Global Times tweeted that the man from Yunnan Province died while on his way back to Shandong Province for work on a bus on Monday. The 32 other people on the bus were also tested for the virus.
What exactly is the Hantavirus?
According to the Centers for Disease Control and Prevention (CDC), hantaviruses are a family of viruses which are spread mainly by rodents and can cause varied diseases in people.
It can cause hantavirus pulmonary syndrome (HPS) and haemorrhagic fever with renal syndrome (HFRS).
The disease is not airborne and can only spread to people if they come in contact with urine, feces, and saliva of rodents and less frequently by a bite from an infected host.
Symptoms of Hantavirus
Early symptoms of HPS include fatigue, fever, and muscle aches, along with headaches, dizziness, chills and abdominal problems. If left untreated, it can lead to coughing and shortness of breath and can be fatal, with a mortality rate of 38 percent, according to CDC.
While the initial symptoms of HFRS too remain the same, it can cause low blood pressure, acute shock, vascular leakage, and acute kidney failure.
HPS can’t be passed on from person to person, while HFRS transmission between people is extremely rare.
As per the CDC, rodent population control is the primary strategy for preventing hantavirus infections.
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 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.
What causes hantavirus pulmonary syndrome?
As stated above, the cause of HPS is 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 the 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 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 shelter for rodents (for example, crawl spaces, vacated buildings, construction sites) may also have increased risk of HPS. The risk is higher in people who work in areas known to have produced HPS infections.
Is hantavirus contagious?
Hantavirus is not contagious from person to person. The virus spreads from rodents to humans. Although outbreaks seem like there is 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 hanta virus 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 hantavirus associated with rodent urine, feces, or saliva. The early symptoms are flu-like, last about four to 10 days, and include the following:
- 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 nausea, vomiting, and diarrhea), headaches, chills, 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 hemorrhagic fever and kidney failure that may require dialysis (HFRS or hemorrhagic fever with renal syndrome).
How do health care professionals diagnose hantavirus pulmonary syndrome?
Currently, there are no readily available tests to diagnose HPS or even hantavirus infection in the early stage of the infection or disease mainly because the early symptoms are so nonspecific and the disease of HPS so infrequent. There has been no pressing need or use for a test.
However, if the more severe HPS disease develops, the disease is presumptively diagnosed by the patient’s association with an area where rodents proliferate or areas where HPS is known to occur (for example, the Four Corners area and more recently the Yosemite National Park recreational area, especially certain tent-cabins rented to the public).
Sequential chest X-rays may show worsening changes and fluid buildup. Definitive diagnosis is usually done by the CDC labs using special immunological tests that can distinguish hantavirus from Ebola, Marburg, and other viruses that may cause a hemorrhagic fever.
What is the treatment for hantavirus pulmonary syndrome?
At this time, there is no definitive treatment for HPS other than early recognition of HPS and subsequent medical support (usually consisting of symptomatic medical treatment and respiratory support or mechanical ventilation).
The CDC suggests that early treatment in an intensive care unit may allow the patient to survive severe HPS. Experimentally, physicians have administered the antiviral medication ribavirin (Rebetol, Copegus), but there are no clear data currently that establish that the drug is effective against HPS; however, its use against HFRS early in the disease suggests ribavirin can decrease illness and deaths. There is no vaccine available to protect against any hantaviruses to date.
What specialties of doctors treat hantavirus?
Unfortunately, hantavirus infections can lead to hantavirus pulmonary syndrome (HPS). Hantavirus infections according to the CDC have a mortality rate of about 38%. Consequently, most patients diagnosed with hantavirus are usually cared for in the intensive care unit by specialists trained in critical care and usually in consultation with an infectious-disease specialist.
Because the lungs are the most compromised organ in these infections, a lung specialist (pulmonologist) is also usually consulted. In addition, specialists from the CDC are often involved to help locate the outbreak source and to help health care personnel at the outbreak site prevent further infections.
What are complications of hantavirus pulmonary syndrome?
The major complication of HPS is death from respiratory failure. Those who survive may take a few weeks to recover fully. Those patients who survive do not have chronic infections nor do they experience other chronic problems or complications.
What is the prognosis of hantavirus pulmonary syndrome?
The prognosis of HPS is fair to poor because currently, about 62% of patients recover, while about 38% will die. The prognosis may be better if the patient gets his/her diagnosis early and given support in an intensive care unit in a hospital. However, the early diagnosis of HPS is difficult; some patients did not know they had been exposed to rodents that carried hantavirus.
Is it possible to prevent hantavirus pulmonary syndrome?
There are no vaccines available to protect against any hantavirus types. The CDC recommends elimination or reduction of contact with any rodents (for example, at home, worksites, campsites, barns, sheds) by reducing rodent access or rodent-proofing. Sealing up gaps and holes, placing traps, and keeping areas as clean and food free as possible will help.
If a person must come in contact with rodents or areas where they live, precautions such as gloves and masks may reduce the chances for infection; disinfectant treatment of possible contaminated surfaces may also help prevent the disease.
Do not attempt to use a vacuum or use a broom to remove rodent urine or feces; this action may increase the risk of HPS by generating an aerosol. The risk of HPS can be reduced by inactivating hantaviruses in the environment by using a household detergent and 1½ cups of bleach per gallon of water to wipe or spray the potentially infected area and while minimizing contact by wearing gloves and a mask. Take similar precautions with rodents caught in traps.
Where can people get more information on hantavirus pulmonary syndrome?
Centers for Disease Control and Prevention
Viral Special Pathogens Branch
1600 Clifton Road
Atlanta, GA 30333