Per CDC:
Key points
Ehrlichiosis is the general name used to describe a group of diseases.
Tick bites from the lone star tick and the blacklegged tick species spread the disease.
In the United States, three species of bacteria lead to the disease.
Doxycycline is the treatment of choice for people of all ages with ehrlichiosis.
Prevention
There is no vaccine to prevent ehrlichiosis. Prevent illness by preventing tick bites, preventing ticks on your pets, and preventing ticks in your yard.
To learn more about preventing tick bites visit: Preventing Tick Bites | Ticks | CDC
Signs and symptoms
Signs and symptoms of ehrlichiosis typically begin within 1-2 weeks after the bite of an infected tick.
Tick bites can be painless, and many people do not remember being bitten.
See your healthcare provider if you become ill after being bitten by a tick or spending time in grassy, brushy, wooded areas.
Early signs and symptoms
Early signs and symptoms (the first 5 days of illness) are usually mild or moderate and may include:
Fever
Chills
Severe headache
Muscle aches
Nausea, vomiting, diarrhea, loss of appetite
Confusion
Rash (more common in children)
Rash
Up to 1 in 3 people with ehrlichiosis report a rash; rash is more common in people with E. chaffeensis ehrlichiosis and generally occurs more often in children than adults. Rash usually develops 5 days after fever begins. If a person develops a rash, it can look like red splotches or pinpoint dots.
Later symptoms
If antibiotic treatment is delayed, ehrlichiosis can sometimes cause severe illness. Early treatment can reduce your risk of developing severe illness.
Signs and symptoms of severe (late stage) illness can include:
Damage to the brain or nervous system (e.g. inflammation of the brain and surrounding tissue (called meningoencephalitis)
Respiratory failure
Uncontrolled bleeding
Organ failure
Death
Risk factors for severe illness:
Delayed antibiotic treatment
Age: younger than 5 years old or older than 65 years old
Weakened immune system: such as those receiving some cancer treatments, individuals with advanced HIV infection, people who have received organ transplants, or people taking certain medications
To learn more visit: About Ehrlichiosis | Ehrlichiosis | CDC
