Light micrograph of Trichinella spiralis a (pork roundworm), adult female. Natural hosts for these nematodes are flesh eating animals such as humans, pigs, and rats. Trichinosis or Trichinella infections can occur when infected meat is not thoroughly cooked. Symptoms of infection include chest pain, diarrhea, myaglia, periorbital oedema, pyrexia, and trismus. Magnification 60x @ 35mm.