12 Key Signs and Early Symptoms of Anaplasmosis You Need to Know
Imagine spending a relaxing day hiking through the woods or enjoying time in your backyard, only to come home feeling unusually tired or unwell. At first, you may assume it is simply a mild cold or temporary exhaustion.
However, those symptoms can sometimes point to something more serious. Anaplasmosis is a tick-borne bacterial infection that can initially look like several common illnesses. Recognizing the symptoms early is important because prompt treatment can help prevent serious complications.
Anaplasmosis is not limited to hikers, campers, or people who regularly spend time outdoors. Anyone who is exposed to infected ticks can develop the illness.
Although the infection is more common in areas where ticks are established, increased outdoor activity means awareness is important for anyone who spends time in wooded or grassy environments. Symptoms can develop within days to a couple of weeks after exposure and may initially resemble the flu.
The illness can begin with symptoms such as fever, unexplained muscle aches, headache, chills, and unusual fatigue. Because these signs can easily be mistaken for another infection, recognizing the connection with a recent tick exposure can be extremely helpful.
In this article, we’ll look at 12 important symptoms of anaplasmosis, explain how the infection develops, discuss possible complications, and review ways to prevent tick-borne diseases.
12 Most Common Signs of Anaplasmosis
Fever
Fever is one of the most common symptoms of anaplasmosis and may appear suddenly. It can become fairly high as the immune system responds to the bacterial infection.
Headache
A persistent or severe headache is another frequent symptom. Some people describe the pain as intense or throbbing, and it may occur alongside fever and other flu-like symptoms.
Muscle Aches (Myalgia)
Widespread muscle aches are common with anaplasmosis. The discomfort can affect different parts of the body and may make normal movement or daily activities difficult.
Chills
Shaking chills can occur along with fever. These episodes are part of the body’s response to the infection and may make a person feel suddenly cold even when their body temperature is elevated.
Fatigue
Anaplasmosis can cause significant tiredness and weakness. Some people may feel extremely exhausted during the infection, and fatigue can continue for some time even after other symptoms begin to improve.
Loss of Appetite
A reduced appetite is another possible symptom. Eating less while experiencing fever and illness can contribute to weakness and may make recovery more difficult.
Nausea and Vomiting
Some people with anaplasmosis develop digestive symptoms such as nausea. In certain cases, nausea may be severe enough to result in vomiting.
Abdominal Pain
Abdominal discomfort can occur in some individuals. The pain may feel dull or aching and can sometimes be mistaken for another gastrointestinal problem.
Cough
A dry cough may develop during anaplasmosis. Although respiratory symptoms are not usually the main feature of the infection, coughing can occur in some patients.
Confusion
More severe infections may cause neurological symptoms, particularly in older adults or people at higher risk of complications. Confusion, difficulty concentrating, or changes in mental awareness can indicate that the illness is becoming more serious.
Rash
A rash is not a common feature of anaplasmosis. When one does occur, it is usually nonspecific and may appear as small red spots or blotches rather than the characteristic rash associated with some other tick-borne diseases.
Malaise
Malaise refers to a general feeling of being sick or unwell. A person may feel uncomfortable, weak, and generally unlike themselves even when they cannot identify one specific symptom causing the discomfort.
The Earliest Symptoms of Anaplasmosis to Appear
The earliest signs of anaplasmosis commonly include sudden fever, headache, muscle aches, and chills. These symptoms can resemble influenza and often develop within about 5 to 14 days after exposure to an infected tick.
Anaplasmosis may seem to appear very suddenly. Someone can feel normal one day and then become noticeably ill the next. Fever is often one of the first prominent symptoms and may be accompanied by chills.
A strong headache can develop around the same time, along with widespread muscle pain and weakness. The combination of fever, headache, and body aches can make the illness feel very similar to the flu.
Because these early symptoms overlap with many viral infections, anaplasmosis may initially be mistaken for influenza or another common illness. This is especially true when the person does not remember being bitten by a tick.
A recent history of hiking, camping, gardening, walking through tall grass, or spending time in wooded areas can provide an important clue. Anyone who develops sudden flu-like symptoms after possible tick exposure should inform a healthcare provider.
What is the Definition of Anaplasmosis?
Anaplasmosis is a bacterial infection that people can develop after being bitten by an infected tick. The illness is caused by Anaplasma phagocytophilum, a bacterium that primarily infects neutrophils, an important type of white blood cell.
After an infected tick bites a person, the bacteria enter the bloodstream and begin targeting neutrophils. These cells normally play an important role in defending the body against infections.
The bacteria can enter these immune cells and reproduce inside them. During this process, characteristic clusters called morulae may form within infected cells.
As the infection spreads, the body’s immune response contributes to many of the symptoms associated with anaplasmosis, including fever, headache, muscle aches, and weakness.
Blood tests may also show changes such as a reduced white blood cell count or low platelet levels. These laboratory findings can provide additional clues that help doctors evaluate a possible anaplasmosis infection.
Is Anaplasmosis A Serious Illness?
Anaplasmosis can become a serious illness if it is not recognized and treated promptly. Most otherwise healthy people who receive appropriate antibiotic treatment recover well, but severe complications can occur, particularly in older adults and people with weakened immune systems.
Severe infections may affect the lungs and can result in acute respiratory distress syndrome (ARDS), a serious condition that interferes with normal oxygen exchange.
In some cases, the infection can also affect the kidneys or liver and may lead to organ dysfunction. A significant drop in platelets, known as thrombocytopenia, can increase the risk of bleeding.
Neurological complications can also occur in severe cases. These may include confusion, seizures, meningitis, or encephalitis.
In the most severe situations, widespread infection and inflammation can result in septic shock, which causes dangerously low blood pressure and can become life-threatening.
Older adults, people with weakened immune systems, and individuals with certain underlying medical conditions are more likely to experience severe disease.
Because complications can develop quickly, recognizing possible symptoms and seeking medical care early are important parts of managing anaplasmosis.
What Are the Causes of Anaplasmosis?
Anaplasmosis is caused by the bacterium Anaplasma phagocytophilum. The infection is primarily transmitted to humans through the bite of an infected tick.
Unlike illnesses that spread directly between people, anaplasmosis is primarily a vector-borne disease. The bacterium depends on ticks to move between infected animal hosts and humans.
Anaplasmosis Transmitting to Humans
Anaplasmosis is mainly transmitted through the bite of infected black-legged ticks, including Ixodes scapularis and Ixodes pacificus.
These ticks can acquire Anaplasma phagocytophilum while feeding on infected animals. Small mammals can serve as important reservoirs for the bacterium.
When an infected tick later feeds on a person, the bacteria can enter the bloodstream through the tick’s saliva.
Nymphal ticks are particularly important because they are very small and can be difficult to notice. If an infected tick remains attached and feeds, the bacteria can be transmitted to the person.
Promptly finding and removing attached ticks is therefore an important way to reduce the risk of tick-borne infections.
The same tick species can carry other pathogens as well, including organisms responsible for Lyme disease and babesiosis. As a result, exposure to an infected tick can sometimes lead to more than one tick-borne infection.
Can You Get Anaplasmosis from Another Person?
Anaplasmosis is not normally spread through everyday person-to-person contact. You cannot generally acquire the infection from someone through touching, coughing, sneezing, sharing food, or sharing drinks.
The bacterium is primarily transmitted through infected ticks. However, extremely uncommon transmission can occur through blood or organ transplantation.
For example, transmission may theoretically occur when blood from an actively infected donor is given to another person. Similar rare situations have been reported in connection with organ transplantation.
These routes are extremely uncommon compared with tick transmission.
For most people, the primary concern is exposure to an infected tick, particularly in areas where anaplasmosis occurs.
Anaplasmosis Diagnosis
Diagnosing anaplasmosis usually involves looking at a person’s symptoms, recent tick exposure, outdoor activities, and laboratory test results.
Because the early symptoms can resemble influenza and other infections, laboratory testing is important when anaplasmosis is suspected.
A healthcare provider may first perform a physical examination and ask about fever, headache, muscle aches, and recent activities in wooded or grassy areas.
Blood testing can then be used to help confirm the infection. A Polymerase Chain Reaction (PCR) test can detect Anaplasma DNA in the blood and is particularly useful during the early stage of illness.
Another approach is antibody testing, also known as serology. These tests look for antibodies produced by the immune system in response to the bacterium.
Antibody levels may not be detectable during the earliest days of illness because the body needs time to produce them. For this reason, doctors may compare an early blood sample with a later sample taken several weeks afterward.
A blood smear can sometimes reveal morulae inside neutrophils, but this method is less sensitive and may not detect every infection.
Anaplasmosis vs. Lyme Disease
Anaplasmosis and Lyme disease can be confused because both may be transmitted by black-legged ticks. However, they are caused by different organisms.
Anaplasmosis is caused by Anaplasma phagocytophilum, while Lyme disease is primarily caused by Borrelia burgdorferi in the United States.
The symptoms can overlap, but there are some important differences. Lyme disease may produce an erythema migrans rash, often described as a bull’s-eye rash, during its early stage. A rash is much less common with anaplasmosis.
Anaplasmosis often begins suddenly with symptoms such as fever, severe headache, chills, and muscle aches.
Lyme disease can also cause flu-like symptoms, but joint pain and certain neurological problems may become more prominent as the infection progresses.
Laboratory findings can also provide clues. Low platelet counts and low white blood cell counts are commonly associated with anaplasmosis.
Because both infections can occur in the same geographic areas, healthcare providers may consider testing for more than one tick-borne disease when symptoms and exposure history suggest possible infection.
Anaplasmosis Complications
When anaplasmosis is not treated promptly, the infection can sometimes progress to a severe illness affecting multiple organ systems.
Severe respiratory complications can occur, including significant inflammation and difficulty breathing that may require hospital care or mechanical ventilation.
Low platelet levels can also cause bleeding problems. In severe cases, this may lead to significant or internal bleeding.
The infection can affect organs such as the kidneys and liver. Acute kidney injury and liver inflammation can occur in serious cases.
Another possible complication is septic shock, in which widespread infection and inflammation cause dangerously low blood pressure and impaired organ function.
Neurological complications are also possible. Severe infections may cause meningitis or encephalitis, which can result in confusion, seizures, reduced consciousness, or other neurological symptoms.
Severe complications are more likely in older adults, people with weakened immune systems, and those who do not receive timely treatment.
Can You Be Infected with Anaplasmosis and Another Tick-borne Disease Simultaneously?
Yes, it is possible to have anaplasmosis along with another tick-borne infection. This is known as a co-infection.
Black-legged ticks can carry more than one pathogen, including Anaplasma phagocytophilum, Borrelia burgdorferi, and Babesia microti.
As a result, a single tick exposure can potentially transmit more than one infection.
Co-infections can make diagnosis more challenging because symptoms from different illnesses may overlap. For example, someone with both anaplasmosis and Lyme disease could have fever and severe headache along with joint pain or a rash.
If a person does not improve as expected after treatment or develops symptoms that do not fit the initial diagnosis, healthcare providers may consider testing for additional tick-borne infections.
Identifying every infection present is important because treatment may need to address each condition separately.
Prevention Strategies Against Tick-borne Diseases
Preventing anaplasmosis and other tick-borne diseases starts with reducing exposure to ticks and removing attached ticks as quickly as possible.
When spending time in wooded areas, tall grass, brush, or leaf litter, use an EPA-registered insect repellent containing ingredients such as DEET, picaridin, or oil of lemon eucalyptus according to the product directions.
Clothing and outdoor gear can also be treated with products containing 0.5% permethrin. Wearing long sleeves, long pants, and light-colored clothing can make ticks easier to spot.
Tucking pants into socks and keeping shirts tucked into pants can also reduce the amount of exposed skin available to ticks.
After returning indoors, carefully check your entire body for attached ticks. Pay particular attention to the underarms, ears, belly button, back of the knees, groin, waist, and scalp.
If you find an attached tick, remove it as soon as possible using fine-tipped tweezers. Grip the tick as close to the skin as possible and pull upward steadily without twisting or crushing it.
FAQs
1. Does anaplasmosis ever go away?
Yes. Anaplasmosis can usually be treated successfully with appropriate antibiotics. Most people who receive timely treatment recover completely.
Recovery may take longer when treatment is delayed or when the infection has become severe. Without treatment, however, anaplasmosis can result in serious complications, including organ problems.
2. What does anaplasmosis do to humans?
Anaplasmosis is a bacterial infection that primarily affects white blood cells. It commonly produces flu-like symptoms such as fever, chills, headache, muscle aches, weakness, and fatigue.
More serious infections can affect the lungs, kidneys, liver, nervous system, and other organs. Severe cases can also cause low blood pressure and other potentially life-threatening complications.
3. Is anaplasmosis life-threatening?
Anaplasmosis can become life-threatening, particularly when treatment is delayed or when a person has risk factors for severe disease.
Possible complications include breathing problems, organ dysfunction, neurological complications, severe bleeding, and septic shock. Older adults and people with weakened immune systems are generally at greater risk.
Early medical evaluation and appropriate antibiotic treatment can greatly reduce the risk of severe complications.
4. How long after a tick bite do you get anaplasmosis?
Symptoms most often develop within about 1 to 2 weeks after an infected tick bite. However, the exact timing can vary between individuals.
Early symptoms commonly include fever, headache, chills, muscle aches, and fatigue. If these symptoms develop after possible tick exposure, especially in an area where anaplasmosis occurs, medical evaluation is important.
5. What smell do ticks hate the most?
Some essential oils and strong scents may have tick-repellent properties, but they should not be relied on as the primary method of tick prevention.
For dependable protection, use an EPA-registered tick repellent as directed, wear protective clothing, avoid areas with heavy tick exposure when possible, and perform thorough tick checks after being outdoors.
6. When is it too late to take medication for a tick bite?
There is no single time limit after a tick bite that determines whether treatment for anaplasmosis will work. If symptoms develop, it is important to seek medical care promptly, even if the bite occurred several days earlier.
Healthcare providers may recommend antibiotics when anaplasmosis is suspected based on symptoms and exposure history. Treatment should not be delayed while waiting for laboratory confirmation when clinical suspicion is high.
7. Can you have anaplasmosis and not know it?
Yes. Some people may have mild symptoms or no noticeable symptoms and therefore may not realize they have been infected.
Others may mistake mild fever, fatigue, headache, or muscle aches for a common viral illness. After a possible tick exposure, it is important to monitor for symptoms and contact a healthcare professional if illness develops.
8. How to confirm anaplasmosis?
Doctors can use blood tests to help confirm anaplasmosis. PCR testing can detect Anaplasma genetic material in the blood and is particularly useful during the early phase of illness.
Antibody testing can also help identify infection, although antibodies may not be detectable during the first several days. Blood smears may occasionally show characteristic bacterial clusters inside white blood cells.
A healthcare provider will interpret these results together with symptoms, exposure history, and other laboratory findings.
Conclusion
Anaplasmosis is a tick-borne bacterial infection that can affect anyone who is exposed to infected ticks. Because its early symptoms can resemble the flu, recognizing signs such as sudden fever, severe headache, chills, muscle aches, and unusual fatigue is important.
Prompt diagnosis and appropriate antibiotic treatment can help prevent serious complications. People who spend time in wooded or grassy areas should take steps to reduce tick exposure and carefully check their bodies after outdoor activities.
Ticks can transmit several infections, so staying alert to possible symptoms after a tick bite is an important part of protecting your health. With prevention, early recognition, and timely medical care, the risk of severe anaplasmosis complications can be reduced.
