My first (and worst) pet was a newt that choked to death on a bad worm.

NEWYORKER: A Box of Puppies

Professor Alexander Trees and his team from the Liverpool School of Tropical Medicine and the University of Liverpool's faculty of veterinary science, found that killing bacteria which are abundant in the worm tissues leads to its death.

BBC: River blindness 'breakthrough'

While Guinea worm disease does not usually result in death, it is associated with incapacitating pain and secondary bacterial infections.

CNN: Rare tropical disease close to eradication