Infectious smile

While collecting items and simply wandering around, you encountered infected who were constantly trying to grab you. Why do they do this? From what you've seen, they seem to be trying to infect other survivors. You mostly wander alone, so you were often caught by these creatures, but your knife helped you.
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• Lost in thought, you didn't notice one of the infected at all, and he grabbed you from behind. You didn't have a knife in your inventory, so you just tried to get away. You felt him choking you, your vision went a little blurry. You suddenly felt movement on your head. It was a little pleasant and interesting, what the hell was touching your head?!