Ehrlichiosis ewingii infection

Ehrlichiosis ewingii infection is a bacterial illness caused by the bacterium Ehrlichia ewingii. This disease is a form of ehrlichiosis, which is transmitted to humans primarily through the bite of an infected tick. Ehrlichia ewingii is known to be carried by the lone star tick (Amblyomma americanum), which is found predominantly in the southeastern and south-central United States. The infection is of particular concern due to its potential to cause significant illness in humans, including fever, muscle aches, and other flu-like symptoms.

Symptoms and Diagnosis

The symptoms of Ehrlichiosis ewingii infection can vary but often include fever, headache, muscle aches, and sometimes a rash. Unlike some other tick-borne diseases, ehrlichiosis does not always produce a rash, making it harder to diagnose based on symptoms alone. Diagnosis typically involves blood tests that detect antibodies to the bacteria or the DNA of the bacteria itself.

Transmission

Transmission of Ehrlichia ewingii occurs through the bite of an infected lone star tick. These ticks are most active during the spring and summer months. The bacteria reside in the tick's salivary glands and are transmitted to humans during a tick bite. It is important to note that the tick typically needs to be attached for several hours before transmission occurs.

Treatment

Treatment for Ehrlichiosis ewingii infection generally involves the use of doxycycline, an antibiotic that is effective against the bacteria. Early diagnosis and treatment are crucial to prevent serious complications, which can include severe fever, bleeding disorders, and, in rare cases, death. For those allergic to doxycycline, other antibiotics may be considered by healthcare providers.

Prevention

Preventive measures against Ehrlichiosis ewingii infection focus on avoiding tick bites. This can be achieved by using insect repellents, wearing long sleeves and pants when in wooded or grassy areas, and performing thorough tick checks after spending time outdoors. Additionally, keeping one's yard free of tall grasses and brush can help reduce the presence of ticks.

Epidemiology

The incidence of Ehrlichiosis ewingii infection has been increasing in the United States, particularly in areas where the lone star tick is prevalent. However, because symptoms can be nonspecific and testing is not routinely performed, the disease is likely underdiagnosed.

See Also

• Ehrlichiosis
• Tick-borne diseases
• Lone star tick