ˈɛktiːvˌiː stɹˈeɪn mˈɑːskoʊ mˈɑːs ðə mˈoʊst vˈɪɹələnt, ɪt wʌz ˈaɪsəlˌeɪɾᵻd baɪ vˈiː. sˈɑːloʊlˌiːv ænd fˈɜːst dᵻskɹˈaɪbd baɪ ˈændɹuːz ænd ˈɛlfɚd.
ECTV strain Moscow (Mos) -  the most virulent, it was isolated by V. Sololiev and first described by Andrewes & Elford.