Severe acute respiratory syndrome (patient information)

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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:

• Fever
• Chills and shaking
• Muscle aches
• Cough
• Headache

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.

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
  • ALT and CPK are sometimes elevated.
  • LDH levels are often elevated.
  • Sodium and potassium are sometimes low.
• 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.

Where to find medical care for Severe acute respiratory syndrome

Directions to Hospitals Treating Severe acute respiratory syndrome