That's right: Miles Morales had a symbiote, and it is able to overcome the corruptive force of the Xenomorphs. "Parasite co-opts parasite. Symbiote seemingly trumps Xenomorph," the new Symbiote ...

If a symbiote attaches to a single Xenomorph or a pack of them, it's also possible for them to hijack the bodies of their hosts and enhance them while feeding their hormones and chemicals.

There have been several shocking moments in just the first two issues, from Black Panther’s son being introduced to a Spider-Man getting a new costume made from both symbiote and Xenomorph.