Answer: They cause the immune system to produce an exaggerated response, distracting it from the actual pathogen.
Step-by-step explanation:
Superantigens are a type of bacteria that suppress the immune system by excessively activating it. They cause the creation of non-specific T-cells which then causes the body to look for other organisms apart from the pathogen.
With the immune system distracted, the pathogen then infects the body thereby making these pathogens particularly dangerous.