The ending of Resident Evil (2026) suggests the outbreak will not be stopped: Bryan turns fully into a monster, kills the last scientist and the only antidote is lost. Spoilers follow, along with my own reading of the finale.
The mechanics are simple. The package Bryan carried held a key ingredient for the antidote, so the cure and the carrier were in the same building. The bite he took on the road meant the thing meant to save the soldiers on the roof was being driven by a man the virus had already claimed. In my opinion that irony is the cleverest part of the script, because the delivery job that opens the film is the thing that dooms the hospital.
The last shot zooms into Bryan's eye and his infected bloodstream before the credits, and the National Guard helicopters closing in as he roars read as arriving too late. Reports of the ending describe no sequel setup, so I would read it as a closed story rather than a teaser. It could be argued that the film wants you to leave on the monster, not on a promise of more.
On creature design, which is what I care about most, the merging bodies echo John Carpenter's The Thing, and Bryan absorbing the scientists as he climbs is the same idea turned inward. The monster is not an outside threat that arrives, it is the main character gradually becoming the thing the building was afraid of. That being said, the film never names the virus, so viewers expecting the T-virus label from the earlier movies will have to infer the link to Umbrella.