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  Semliki Forest   SFV

Arbovirus

No

3

Fatal human laboratoryinfection, 1978, probably aerosol. This is recognized to be a unique incident in a long history of work with SFV under minimal biocontainment conditions. However, since the virulence characteristics of the strain responsible in this case require further study and the prevalence of subclinical infections in laboratories working with SFV remains unknown, the committee recommends Level 3 until further information is available warranting reconsideration at a lower level.
Other Information
 

A
Section V - Antigenic Relationship and Lack of Relationship to Other Viruses
 
Apparently identical to Kumba virus [5] , [15] .
Indistinguishable by cross-neutralization from Paramaribo virus, but a human Paramaribo convalescent serum in NT with Semliki gave Ht/Ho = 2.8/5.7 [25] .
Cross-reactive by HI with other members of Casals' Group A, and sometimes cross-reactive with these by NT, but easily differentiated [15] .
Mice immunized with Mayaro or Sindibs [17] or attenuated VEE [7] show significant protection against Semliki challenge. Guinea pigs are protected against small doses of VEE or EEE by 2 (but not 1) doses of Semliki [7] .
The course of a human EEE Infection may have been modified by pre-existing Semliki immunity [26] .
SIRACA considers Semliki Forest virus to be a distinct virus type in serogroup A [10] ; it is a member of the Semliki complex, one of six complexes comprising serogroup A [10] .
 
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