Wanted to make a Particles collision that will kill other actor on the hit of particle and will leave some actors undisturbed

Hi! I Wanted to make a Particles collision that will kill other actor on the hit of particle and will leave some actors undisturbed. I am making a game in covid-19 that a virus is moving but when it is touched by a particle it will die. I have my game ready but i am really stuck on this part. Thanks