| | | | | | NDU Antigen [2] | | NDU HIAF [2] |
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| HIAF | CF | Antigens | CF |
|---|
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| | Results expressed as quotient of Ho/Ht titers | | Chikungunya | >128 | Chikungunya | >32 | | Middelburg | 32 | Middelburg | 32 | | Semliki Forest | >1024 | Semliki Forest | >32 | | Sindbis | >512 | Sindbis | >32 |
| | In cross PRNT, NDU virus was neutralized to a titer of 15 by a Whataroa antiserum (Ho titer = 100) but no reactions either way were obtained with WEE, Sindbis, Aura, VEE, Mucambo, Pixuna, Semliki Forest, Mayaro, chikungunya, Una, o'nyong nyong, Bebaru, Getah, Ross River, EEE, and Middelburg [3] . | | In cross-neutralization tests in micro-cell culture NDU virus was neutralized by Aura antiserum Ho LNI (dex)/Ht LNI (dex) = 6.0/1.2) but not by antisera of 20 other group A viruses. NDU antiserum neutralized WEE virus (4.3/1.0) but none of the viruses [4] . | | Placed in WEE serological subgroup as a distantly related member [5] . SIRACA has not placed NDU virus in the WEE complex. The virus is considered to be a distinct type which is not closely related to any other group A arbovirus; and thus has been placed in the Ndumu complex [12] . | | |
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