Infected Zombie keeps killing everything

I was to sure what the correct ticket was or not but my friend I keep dying to this thing called Infected Zombie, it keeps killing all of the npcs we are trying to quest, I took a screenshot of it. We have to die just for it to go away for them to come back and kill us. Please help, my friend is new to the game and I don’t want this to ruin his starting experience.

Stay out of the capital cities.

its not just capital cities we are starter area for the humans so its easier to help my friend learn the game because Im an older player and thats the area Im used to but we cant go anywhere without just dying, I just logged in within seconds I died.