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Eastern Equine Encephalitis Virus Antibody Titer, Serum — Immunofluorescence Assay

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

Detects and measures antibodies to eastern equine encephalitis virus in serum to help evaluate possible exposure or infection.

Quick summary

["A rising antibody titer can support a recent eastern equine encephalitis virus infection, while a single result may not confirm infection."]

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

Key facts at a glance

LOINC
24214-9
Short code
EEEV Ab sp2 Titr Ser IF
Synonyms
EEEV Ab sp2 Titr Ser IF
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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 blood test measures antibodies against the eastern equine encephalitis virus, a mosquito-borne virus that can cause inflammation of the brain. The antibodies are detected using an immunofluorescence assay.

Why might I need this test?

Testing may be considered after exposure to mosquitoes in an area where the virus is found or when compatible symptoms occur, such as fever, severe headache, confusion, or seizures. Comparing acute and convalescent samples can help determine whether a recent infection is likely.

How is the test performed?

Blood is collected through a vein in the arm and separated into serum. Laboratory staff use the serum to detect virus-specific antibodies and report a titer, which shows the level of antibody activity measured by the assay.

How do I prepare for the test?

No special preparation or fasting is usually required. Tell your clinician about recent travel, mosquito exposure, illness timing, and any previous vaccination or infection, because these details help interpret the result.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Eastern equine encephalitis virus antibody titer

Frequently asked questions

Does a positive result mean I currently have eastern equine encephalitis?
Not necessarily. Antibodies can remain detectable after a past infection or vaccination, so timing, symptoms, exposure history, and changes in antibody levels must be considered.
Why might two blood samples be needed?
Antibodies may not be detectable early in an infection. Comparing an early sample with a later sample can show a rise in antibody activity, which is more useful for confirming a recent infection.
Can this test rule out infection after a mosquito bite?
A negative result is less helpful when performed very early because the immune response may not yet have developed. Your clinician may recommend repeat testing based on symptoms and exposure risk.
  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