invasion B1

/ɪnˈveɪʒən/ (pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body

invade A2

/ɪnˈveɪd/ march aggressively into another's territory by military force for the purposes of conquest and occupation

pervasive C2

/pɚˈveɪ.sɪv/ Manifested throughout; pervading, permeating, penetrating or affecting everything.