Volume 27, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Human sera from one case of polycystic hydatidosis due to and from a case of cysticercosis and multiple myeloma were positive to the immunoelectrophoresis (IEP) test for hydatidosis based on the arc 5 positivity criterion. Arc 5 can therefore be elicited in IEP tests of human sera not only by and but also by antigens. Whether the cross reaction observed in the second serum was due to the multiple myeloma or to the cysticerci remains to be determined. Although arc 5 antigens are known to be present in cyst fluid, this is the first report of an arc 5 due to antigens other than in IEP of human sera.


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