- At the 2021 annual meeting, the Council of State and Territorial Epidemiologists (CSTE) approved a position statement standardizing a case definition for alpha-gal syndrome (AGS).
- The case definition is for surveillance purposes only and does not replace a clinical diagnosis by a healthcare provider.
- A standard surveillance case definition provides consistent laboratory and clinical criteria to ensure that data captured across multiple jurisdictions are comparable.
- AGS is not a nationally notifiable condition.
- States and local jurisdictions are encouraged, but not required to share information on AGS with members of CDC’s Rickettsial Zoonoses Branch to better understand national trends.
Surveillance case definition [PDF – 12 pages]
Alpha-gal Syndrome Case Report Form [PDF – 2 pages]
- The main diagnostic test for AGS is a blood test looking for immunoglobulin-E antibodies specific to alpha-gal (alpha-gal sIgE).
- Tests for alpha-gal sIgE antibodies are available at several large commercial laboratories and may be available at certain academic institutions.
- LOINC Code: 73837-7 Galactose-alpha-1,3-galactose (Alpha-Gal) IgE Ab [Units/volume] in Serum.
- Skin tests documenting reaction to certain allergens (such as pork or beef) may also be used to diagnose AGS.