Anaplasmosis is a bacterial infection caused by the bacterium *Anaplasma phagocytophilum*. It is primarily transmitted to humans through tick bites and commonly affects people in the upper Midwest and northeastern United States, as well as parts of Europe and Asia. It can cause a range of flu-like symptoms. Track Anaplasmosis activity and outbreaks specific to Missouri.
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Human granulocytic anaplasmosis (HGA) was first recognized as a distinct human disease in the United States in 1990 in Wisconsin and Minnesota. It was initially identified as human granulocytic ehrlichiosis before the causative agent was reclassified. Its discovery highlighted the expanding spectrum of tick-borne diseases affecting humans.
Anaplasmosis is primarily transmitted to humans through the bite of an infected tick. In the United States, the **blacklegged tick** (*Ixodes scapularis*) is the main vector in the Northeast and Midwest, and the **western blacklegged tick** (*Ixodes pacificus*) on the Pacific coast. Ticks acquire the bacteria by feeding on infected animals such as white-footed mice and other small mammals, then transmit it during subsequent blood meals.
Contagious Period: Varies by disease
Local health department information and state-specific prevention guidance
Our AI-powered surveillance continuously monitors Anaplasmosis activity across Missouri. We track data from state health departments, local hospitals, CDC reports, and 50+ global health sources to provide early warning of emerging threats.
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For official state health alerts, vaccination locations, and public health guidance specific to Missouri, visit your state health department's website.
Whether you live in Missouri, are traveling there, or have family in the state, understanding Anaplasmosis prevention is essential. Follow these evidence-based prevention measures:
If you experience symptoms of Anaplasmosis in Missouri, contact your healthcare provider immediately. Early diagnosis and treatment improve outcomes significantly.
Emergency symptoms: If you experience severe symptoms, difficulty breathing, or signs of dehydration, call 911 or go to your nearest emergency room.
Trusted information from leading health organizations
Global disease surveillance and guidelines from the World Health Organization
View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-06-03
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