Signs and symptoms
... The VHF designation includes a broad range of diseases. As a result, signs and symptoms can vary widely, even among members of the same viral family. But VHFs do have some common characteristics, espe...

Causes
... Emerging diseases are infections that are appearing for the first time or that are rapidly increasing in incidence and range. Many of these infections have surfaced in the past several decades, includ...

Risk factors
... The chance of contracting most VHFs is low. Some are confined to isolated pockets in remote areas where the risk of transmission is slight. And because each virus is usually associated with a specific...

When to seek medical advice
... See a doctor immediately if you suspect you''ve been exposed to a VHF virus. If you become ill while traveling in a foreign country, call the U.S. consulate for a list of doctors. Better yet, find out...

Screening and diagnosis
... Diagnosing specific VHFs in the first few days of illness can be difficult. All infected people initially exhibit the same signs and symptoms: fever, muscle aches, headache and extreme fatigue. What''...