The Indiana and New Jersey serotypes of vesicular stomatitis virus were differentiated by Cotton in 1927. They remained the only known members of the group until the Cocal (Jonkers 1964), Brazil (Andrade 1964, cited by Federer, Burrows & Brooksby, 1967) and Argentina (Garcia Pirazzi, Caggiano & Alfonso Fernandez, 1963) viruses were described. Federer (1967) demonstrated a close relationship between the Cocal and Argentina strains, and although the Brazil, Argentina/Cocal and Indiana strains were shown to differ serologically, they were still considered as subtypes of a group distinct from that of the New Jersey serotype.

Cartwright & Brown (1972) confirmed recently that only the Cocal and Argentina strains showed significant cross-reactions in complement fixation and serum neutralization tests. However, the infective skeleton-like particles produced by treatment with Tween-ether or Nonidet and the infective ribonucleoprotein (RNP) released by sodium deoxycholate showed considerable cross-reactions in both tests. On this basis the major cross-reactivity was considered to be associated with the RNP.


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