Symptoms:

Symptoms of avian flu infection in humans depend on the strain of virus.

Infection with the H5N1 virus in humans causes typical flu-like symptoms, which might include:

• Cough (dry or productive)
• Diarrhea
• Difficulty breathing
• Fever greater than 100.4°F (38°C)
• Headache
• Malaise
• Muscle aches
• Runny nose
• Sore throat

Signs and tests:

If you think you have been exposed to avian influenza, call your health care provider before your visit. This will give the staff a chance to take proper precautions that will protect them and other patients during your office visit.

Tests to identify the avian flu exist but are not widely available. A test for diagnosing strains of bird flu in people suspected of having the virus gives preliminary results within 4 hours. Older tests took 2 to 3 days.

Your doctor might also perform the following tests:

• Auscultation (to detect abnormal breath sounds)
• Chest x-ray
• Nasopharyngeal culture
• White blood cell differential

Other tests may be done to look at the functions of your heart, kidneys, and liver.