Rift Valley Fever

Priority List of Adverse events of special interest for

Rift Valley Fever

Version 2.1 (Updated 17 October 2025)
AESI: Myocarditis / Pericarditis
Specific to Rift Valley Fever disease: ✅
Specific to vaccine: MVA
Brighton Case Definition:  Click to access
Brighton CD Companion Guide: Click to access
AESI: Uveitis, retinitis, acute optic neuritis
Specific to Rift Valley Fever disease: ✅
Brighton Case Definition: NO
Brighton CD Companion Guide: NO
AESI: Hemorrhagic disease
Specific to Rift Valley Fever disease: ✅
Brighton Case Definition: NO
Brighton CD Companion Guide: NO


AESI: Thrombocytopenia
Specific to Rift Valley Fever disease: ✅
Specific to vaccine: All vaccines
Brighton Case Definition: Click to access
Brighton CD Companion Guide: Click to access


AESI: Thrombocytopenic Thrombosis Syndrome
Specific to Rift Valley Fever disease: ✅
Specific to vaccine: Adenoviral vectors
Brighton Case Definition: Click to access
Brighton CD Companion Guide: Click to access


AESI: Acute hepatitis / fulminant liver failure
Specific to Rift Valley Fever disease: ✅
Brighton Case Definition: NO
Brighton CD Companion Guide: NO
AESI: Anaphylaxis
Specific to vaccine: All vaccines
Brighton Case Definition: Click to access
Brighton CD Companion Guide: Click to access

AESI: Aseptic meningitis
Specific to vaccine: Live attenuated viral vaccine​
Brighton Case Definition: Click to access
Brighton CD Companion Guide: Click to access


AESI: Encephalitis
Specific to Rift Valley Fever disease: ✅
Specific to vaccine: Live attenuated viral vaccine
Brighton Case Definition: Click to access
Brighton CD Companion Guide: Click to access


AESI: Generalized convulsive seizure
Specific to Rift Valley Fever disease: ✅
Specific to vaccine: All vaccines
Brighton Case Definition: Click to access
Brighton CD Companion Guide: Click to access


AESI: Guillain Barré Syndrome
Specific to Rift Valley Fever disease: ✅
Specific to vaccine: Some vaccines¹
Brighton Case Definition: Click to access
Brighton CD Companion Guide: Click to access

¹Some seasonal influenza vaccines; monovalent H1N1 pandemic vaccine; COVID-19 ChAdOx-1 S vaccine.
AESI: Acute aseptic arthritis
Specific to vaccine: VSV vector
Brighton Case Definition: Click to access
Brighton CD Companion Guide: Click to access
 

AESI: Acute kidney injury/renal failure
Specific to Rift Valley Fever disease: ✅
Brighton Case Definition: NO
Brighton CD Companion Guide: NO

This list of potential Adverse Events of Special Interest (AESI) that could follow vaccines to prevent Rift Valley fever was developed based on criteria established by the Safety Platform for Emergency Vaccines (SPEAC), which include: 

  1. A known association with immunization or a specific vaccine platform.
  2. The occurrence during wild-type disease due to viral replication and/or immunopathogenesis.
  3. A theoretical association derived from animal models. 

Special populations, including pregnant women, children, adolescents, and immunosuppressed individuals, may experience an increased frequency and severity of any of the AESIs listed as relevant to all populations. There are also specific AESI that are of particular relevance to special populations, and these are listed according to the population. It is important to note that children, pregnant women and immunocompromised individuals may also have increased severity of expected local and systemic reactogenicity, as well as unexpected autoimmune conditions. 

Note: This AESI list is meant to be a reference; if certain AESIs on the list will be captured in routine safety surveillance in a study, those AESIs may not need to be protocol-specified. Only a subset of the AESI list will typically need to be included as protocol-specified AESIs: those that would require a systematic approach to data collection to characterize; or that may not be captured in routine safety surveillance.

*Guidelines for data collection exists as part of the GAIA project 

Zenodo publication with citable DOI (includes methods of AESI list creation) available HERE

SEE ALL THE LISTS OF AESIs FOR THE CEPI PRIORITIZED PATHOGENS:

COVID-19
Chikungunya
Lassa Fever
Rift Valley Fever

SEE ALL THE LISTS OF AESIs FOR THE CEPI PRIORITIZED PATHOGENS:

COVID-19
Chikungunya
Lassa Fever
Rift Valley Fever