PROBLEM TO BE SOLVED: To provide means of isolation and/or identification of novel Feline morbillivirus strain, and to provide effective preventive means against Feline morbillivirus infection.SOLUTION: The invention provides a novel Feline morbillivirus strain which has H protein, F protein, N protein, P protein, L protein, and M protein, wherein an amino acid sequence of the H protein is a specific sequence or a sequence having 95% or more homologous to the sequence; an inactivated vaccine formulation and mixed inactivated vaccine formulation containing the virus strain subjected to inactivation treatment; and a Feline morbillivirus infectious disease prevention method comprising a process of administering the formulation to a feline.【課題】ネコモルビリウイルスの新規株の分離・同定、ネコモルビリウイルス感染症に対する有効な予防手段の提供。【解決手段】Hタンパク質、Fタンパク質、Nタンパク質、Pタンパク質、Lタンパク質、Mタンパク質を有し、前記Hタンパク質のアミノ酸配列が、特定の配列、又は該配列と95%以上の相同性を持つ配列である新規ネコモルビリウイルス株、不活化処理された該ウイルス株を含有する不活化ワクチン製剤及び不活化混合ワクチン製剤、並びに前記製剤をネコに投与する手順を含むネコモルビリウイルス感染症予防方法。【選択図】図1