"So it's really like that, eh? As long as they recognize someone as one of their own, they don't attack..."
"Looking at it this way, their behavior patterns are somewhat similar to zombies. If this spreads, it could become a terrifying plague. But it's been over a dozen days, and the island hasn't been quarantined. The epidemic is still confined within it."
After being embraced by the girl, Wen Wen was seen as one of their kind by these infected people, so he could move around freely here.
However, their spikes couldn't even pierce through Wen Wen's Containment Officer uniform.
Not to mention that Wen Wen had scratchlessly scratched over his entire body. Even without the Containment Officer uniform, those spikes couldn't even penetrate his oily skin.