Severe acute respiratory syndrome (patient information): Difference between revisions
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Revision as of 17:57, 3 March 2010
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What is Severe acute respiratory syndrome?
Severe acute respiratory syndrome (SARS) is a serious form of pneumonia, caused by a virus isolated in 2003. Infection with the SARS virus results in acute respiratory distress (severe breathing difficulty) and sometimes death. It is a dramatic example of how quickly world travel can spread a disease. It is also an example of how quickly a networked health system can respond to an emerging threat.
What are the symptoms of Severe acute respiratory syndrome?
The hallmark symptoms are fever greater than 100.4 degrees F (38.0 degrees C) and cough, difficulty breathing, or other respiratory symptoms. Symptoms in the order of how commonly they appeared have included:
Less common symptoms include (also in order):
- Dizziness
- Productive cough (sputum)
- Sore throat
- Runny nose
- Nausea and vomiting
- Diarrhea
What causes Severe acute respiratory syndrome?
SARS is caused by a member of the coronavirus family (the same family that can cause the common cold).
When someone with SARS coughs or sneezes, infected droplets spray into the air. You can catch SARS if you breathe in or touch these particles. The SARS virus may live on hands, tissues, and other surfaces for up to 6 hours in these droplets and up to 3 hours after the droplets have dried.
While droplet transmission through close contact was responsible for most of the early cases of SARS, evidence began to mount that SARS might also spread by hands and other objects the droplets had touched. Airborne transmission was a real possibility in some cases. Live virus had even been found in the stool of people with SARS, where it has been shown to live for up to four days. And the virus may be able to live for months or years when the temperature is below freezing.
With other coronaviruses, re-infection (becoming infected and falling ill again) is common. Preliminary reports suggest that this may also be the case with SARS.
Symptoms usually occur about 2 to 10 days after coming in contact with the virus, although there have been some cases where the illness started considerably sooner or later. Those with active symptoms of illness are clearly contagious, but it is not known how long a person may be contagious before or after symptoms.
Who is at risk for Severe acute respiratory syndrome?
How do I know I have Severe acute respiratory syndrome?
Your health care provider may hear abnormal lung sounds while listening to the chest with a stethoscope. In most persons with SARS, worsening chest x-ray or chest CT changes show the presence of pneumonia or respiratory distress syndrome.
Tests used to diagnose SARS might include:
- Blood clotting tests
- Blood chemistries
- Chest x-ray or chest CT scan
- Complete blood count (CBC)
- White blood cell (WBC) count may be low.
- Lymphocyte count may be low.
- Platelet count may be low.
Much attention was given early in the outbreak to developing a quick, sensitive test for SARS. Specific tests include the PCR test for SARS virus, antibody tests for SARS, and direct SARS virus isolation. All current tests have some limitations.
When to seek urgent medical care
Call your health care provider if you suspect you or someone you have had close contact with has SARS.
Treatment options
Persons suspected of having SARS should be evaluated immediately by a health care provider, and hospitalized under isolation if they meet the definition of a suspected or probable case.
Treatment may include:
- Antibiotics to treat bacterial causes of atypical pneumonia
- Antiviral medications
- High doses of steroids to reduce lung inflammation
- Oxygen, breathing support (mechanical ventilation), or chest physiotherapy
In some serious cases, blood serum from people who have already recovered from SARS has been given. There is no strong evidence that these treatments work well.
Where to find medical care for Severe acute respiratory syndrome
Directions to Hospitals Treating Severe acute respiratory syndrome
Prevention of Severe acute respiratory syndrome
Reducing your contact with someone with SARS lowers the risk for the disease. Ways to do this may include limiting travel to locations where there is an uncontrolled outbreak. When possible, avoid direct contact with persons who have SARS for at least 10 days after their fever and other symptoms are gone.
The U.S. Centers for Disease Control and Prevention (CDC) says hand hygiene is the most important part of SARS prevention. This might include hand washing or cleaning hands with an alcohol-based instant hand sanitizer.
Persons should be taught to cover the mouth and nose when sneezing or coughing. Respiratory secretions should be considered infectious, which means no sharing of food, drink, or utensils. Commonly touched surfaces can be cleaned with an EPA approved disinfectant.
In some situations, appropriate masks and goggles may be useful for preventing spread of the disease. Gloves might be used in handling potentially infectious secretions.
What to expect (Outlook/Prognosis)
As the first wave of SARS began to subside, the death rate proved to have been about 14 or 15 percent of those diagnosed. In people over age 65, the death rate was higher than 50 percent. Many more were sick enough to require mechanical ventilation. And more still were sick enough to require hospitalization in intensive care units.
Intensive public health policies are proving to be effective in controlling outbreaks. Many nations have stopped the epidemic within their own countries. All nations must be vigilant, however, to keep this disease under control. Viruses in the coronavirus family are known for their ability to change (mutate) in order to better spread among humans.