| |
| The following basic data were extracted from Casals [8] . For antigenic relationships to newer members of Group A, consult their respective catalogue cards. Hearn [9] has shown some crossing between EEE and VEE viruses in mouse NT tests. |
| |
| | VEE Antigen | | VEE Immune Mouse Serum |
|---|
| | HI | | HI |
|---|
| Immune Mouse Sera | Ht/Ho | Index | Antgens | Ht/Ho | Index |
|---|
|
| | Chikungunya | ND/1280+ | | Chikungunya | 80/640+ | 1/8+ | | Mayaro | 40/1280+ | 1/32+ | Mayaro | 80/640+ | 1/8+ | | Semliki | 80/2560 | 1/32 | Semliki | 40/640+ | 1/32+ | | Sindbis | 10/1280 | 1/128 | Sindbis | 20/640+ | 1/32+ | | WE | 160/10,240 | 1/64 | WE | 80/640+ | 1/8+ | | EE | 80/10,240 | 1/128 | EE | 160/640+ | 1/4+ |
|
| See Reference [10] by Young and Johnston for original antigenic classification of viruses of the VEE complex. In their classification, based upon kinetic HI studies, this original strain of VEE virus is designated type IA. |
| For further information on antigenic classification, see Reference [31] . |
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