New Tick-Borne Disease on the Rise
April 6, 2000 (Washington) -- Just about everyone has heard of Lyme disease.
But there is another illness caused by the same deer tick that may be even more
serious, yet it isn't well known, even among physicians, say researchers at
The illness is called ehrlichiosis, and it also results from a tick bite. It
was first documented in humans only six years ago. Lyme disease was first
reported in the 1970s. Both illnesses were common to animals before they were
found to affect people.
People who have ehrlichiosis might easily mistake their symptoms for the
flu, and there is no telltale rash like the one that often accompanies Lyme
disease. Ehrlichiosis most commonly causes a high fever that can reach 104? or
greater, intense headaches, and body aches. If untreated, the illness can cause
internal bleeding and infections such as pneumonia.
A research team lead by Jacob W. IJdo, MD, found an average of about 35
yearly cases of ehrlichiosis per 100,000 residents in the 12-town area
surrounding Lyme, Conn. -- 20 to 30 times higher than earlier estimates of this
region. IJdo is a rheumatologist and associate research scientist at Yale
University School of Medicine.
Ehrlichiosis still occurs much less frequently than Lyme disease. However,
these rates of ehrlichiosis are comparable to early reports of Lyme
As with Lyme disease, ehrlichiosis is thought to be more common among two
age groups -- children aged 4-15 and among people in early adulthood, although
this current study did not find many cases in children. It can be diagnosed
with a blood test and treated with antibiotics. Of interest is that someone can
actually be infected with Lyme disease and ehrlichiosis at the same time,
according to M. Dana Ravyn, PhD, a microbiologist at the University of
Minnesota, who was not involved in the study.
Researchers are unsure of what will happen in the future with ehrlichiosis.
IJdo tells WebMD he does not know if ehrlichiosis will ever approach the
current level of Lyme disease infections.
Anthony Lionetti, MD, doesn't doubt that ehrlichiosis may yet prove to be as
common as Lyme disease as awareness of the condition increases among patients
and doctors. He is an internal medicine specialist in Hammonton, N.J., and a
consultant to the Lyme Disease Foundation in Hartford, Conn.
Ravyn says this research makes an important contribution. "These studies
will help to increase understanding and awareness on part of both physicians
and the public."
- Ehrlichiosis is a disease that results from a tick bite, with symptoms of
high fever, intense headaches, and body aches, and if left untreated it can
lead to internal bleeding and infections such as pneumonia.
- In an attempt to determine how common ehrlichiosis is in an area known for
tick-associated diseases, researchers found it was 20-30 times more prevalent
than earlier estimates.
- Many people, including physicians, are unaware of this disease, so often
the diagnosis can be missed.