Its a good show and I really liked it but I have a few "yeah, but......"
So if the larvae grew in the host and made the host want to open up the victim in order to vomit into their stomach - what happens to the larvae after? The boy survived albeit borderline locked in. The Spanish bird seems to have survived albeit with a hole in her chest but the fat bird died?
I think when the wasps infect humans (the kid) where they essentially become slaves with the task to find a place for the larvae to grow and feed. Its the body can fight the larvae (the hosts all get ill before killing) but when your almost dead the can't fight the larvae?
Bit of a meh ending but it could have been worse.