ATLASHEART AND MUSCLES PARASITES
      NEMATODA Order: Trichurata

      TRICHINELLA SPIRALIS

      Adapted and redrawn from NCDC

      spir1-ic

      Trichinella spiralis: life cycle.


       

      Development of Trichinella spiralis in skeletal muscles

      Picture 1

      Picture 2

      Picture 3

      By Wanda Sokolowska-Köhler Dr.

      By Wanda Sokolowska-Köhler Dr.


      By Wanda Sokolowska-Köhler Dr.
       

      TSLarvwandSK-ic
      Migrated larvae

      TSLarvcapsSK-ic
      Encapsulated larvae

      TSLarvcaps1SK-ic
      Calcified larvae


      spir2-ic

      Trichinella spiralis: Trichinella spiralis larvae encysted in striated muscle.
      The cyst, elongated in shape, measures 0.3-0.6 by 0.2-0.3 mm.
      (H&E stain).


      spir3-ic

      Trichinella spiralis: the cyst is formed outside by a fibrous capsule and
      inside by an eosinophil infiltration around the tightly coiled larvae.
      (H&E stain).


      spir4.ic

      Trichinella spiralis: massive infection may cause acute enteritis;
      the migration and the later muscle encystation of larvae may
      be asymptomatic or cause serious generalized disease with
      possible miocardial and brain pathology.
      (T.s. larvae).


      spir5.ic

      Trichinella spiralis: diagnosis of T.s. infection is based on serology and
      on finding of larvae in the striated muscle biopsy.
      (T.s. larvae after muscle digestion, fresh examination).


      spir6.ic

      Trichinella spiralis: after muscle digestion the T.spiralis larva
      measures 1 mm in lenght.
      (Fresh examination after muscle digestion).


      By Dr Sixto Raùl Costamagna

      spir7.ic

      Trichinella spiralis: Electron microscopy