In pernicious anemia, which of the following antibodies is characteristically detected?

Initiation of the activation mechanism of the alternative complement pathway differs from that of the classic pathway in that:

Washed red blood cells would be the product of choice for a patient with:

Which antibody isotype is important for the laboratory diagnosis of congenital rubella or primary infection in the mother?

Cells that assist B cells in responding to antigen molecules are:

Cells that are precursors of plasma cells that produce immunoglobulins are:

Patients suffering from Waldenstrom macroglobulinemia demonstrate excessively increased concentrations of which of the following?

An example of an organ specific disease with autoimmune antibodies is:

Both classic and alternative complement activation pathways converge at the C3b fragment, from which they share the same final steps that culminate in:

A 25-year-old female suffering from systemic lupus erythematosus (SLE) and an ear infection is tested for syphilis using the RPR card test. The result is reactive; however, the patient denies any sexual activity. A repeat test 8 months later is still reactive although the ear infection has resolved. The most likely explanation for these results is