ˈɛktiːvˌiː stɹˈeɪn nˈeɪvəl nˈæv ˈaɪsəlˌeɪɾᵻd fɹʌm ɐn ˈaʊtbɹeɪk ɪn ɐ jˌuːˈɛs nˈeɪvəl ɹᵻsˈɜːtʃ fəsˈɪlᵻɾi, wˌɪtʃ mˈænɪfˌɛstᵻd æz ɐ lˈiːθəl dɪzˈiːz ɪn bˈælb slˈæʃ sˈiː mˈaɪs ænd ɐ mˈaɪld dɪzˈiːz wɪð lˈoʊ mɔːɹbˈɪdᵻɾi ænd mɔːɹtˈælᵻɾi ɪn sˌiːdˈiː wˈʌn mˈaɪs.
ECTV strain Naval (Nav) -  isolated from an outbreak in a US naval research facility, which manifested as a lethal disease in BALB/c mice and a mild disease with low morbidity and mortality in CD-1 mice.