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Eastern Equine Encephalitis Virus IgG and IgM Antibodies, Serum

Published: August 9, 2026Updated: August 16, 2026

Serum testing for antibodies to Eastern equine encephalitis virus can help support a diagnosis, especially with compatible symptoms and mosquito exposure.

Quick summary

["IgM may support recent infection, while IgG usually indicates earlier exposure; results must be interpreted with symptoms and timing."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
110962-8
Short code
EEEV IgG Msmt Ser
Synonyms
EEEV IgG Msmt Ser
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

This test measures IgG and IgM antibodies against Eastern equine encephalitis virus (EEEV) in your blood. Antibodies are proteins made by your immune system after exposure to the virus.

Why might I need this test?

The test may be ordered if you have fever, headache, confusion, seizures, or other neurologic symptoms after possible mosquito exposure. Travel, outdoor activities, and contact with infected animals are also relevant.

How is the test performed?

A blood sample is collected and tested in a laboratory for virus-specific antibodies using an antibody assay, commonly an immunoassay. Your clinician may request additional testing to confirm an unexpected result.

How do I prepare for the test?

No special preparation is usually needed. Tell your clinician about recent travel, mosquito bites, animal exposure, symptoms, and when they began, because these details affect interpretation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

EEEV IgG and IgM antibodies

Frequently asked questions

What does a positive EEEV antibody result mean?
It indicates that antibodies to EEEV are detectable, but it does not by itself show where or when exposure occurred. IgM more often suggests recent infection, while IgG commonly reflects earlier exposure.
Can I have EEEV antibodies without feeling sick?
Yes. Antibodies can remain after a past infection, and some results may reflect cross-reactivity with another virus. Your clinician will consider symptoms, exposure, and confirmatory testing when interpreting the result.
Could a negative result still mean I have EEEV?
Yes. Antibodies may not be detectable early in the illness, especially if the test is performed soon after symptoms begin. Repeat or additional testing may be needed when suspicion remains high.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy