Techniques for applying torque to microscopic paramagnetic structures in a body includes exposing a body simultaneously to a first magnetic field oscillating at a first frequency in a first direction and a different second magnetic field oscillating at a second frequency in a second direction. The body includes a plurality of microscopic paramagnetic structures for which magnetic susceptibility to the first magnetic field is different from magnetic susceptibility to the second magnetic field. Such techniques are effective for ameliorating a symptom of a disease in an animal in which disease agents or diseased cells selectively include microscopic paramagnetic structures, including malaria.
