This plaga variant, unlike its predecessors, included new effects such as the infected hosts not talking and making moaning sounds and walking more like a Zombie after the plaga hatches and enters adulthood.
Ada Wong remarked this Plaga type as a defective product, arguably due to zombie-like behavior hosts of this variant's subordinate-strain displayed and its dominant species variant's gradual regression into subordinate-strain as shown in case of Ivan Judanovich and Alexander Kozachenko. The afromentioned flaws however, were exploited by Svetlana Belikova as a secret plan to destroy the rebels' leadership.
The plaga replacing the host's head.
Effects of the plaga, note the red eyes, pale face and protruding veins.