 Peggy Kenter (Anita Gillette), a Board of Health (BOH) inspector and an acquaintance of Carr's, decides to quarantine the hotel, thinking a virus is at work.But Mike soon discovers that there is an immense ant nest in the pit, and concludes that these insects are responsible for the attacks.Tom (Bruce French), a BOH researcher, finally discovers that the ants are highly poisonous and resistant to insecticides.