A viral disease that is almost always fatal can be prevented with proper treatment. Errors in preventive treatments and increased exposure to this disease have prompted federal health officials to issue a warning.

The number of cases has risen, with a notable increase in instances where multiple people were exposed. Recently, a large group of nearly 300 people was affected.

Further details about the warning and the disease are available from the Centers for Disease Control and Prevention, which has reported a significant uptick in related inquiries over the past couple of months.