It Is Safer to Repeat the Immunizations or to Draw

It is safer to repeat the immunizations or to draw immunization blood titers if the records are questionable or if the children are from orphanages in Eastern Europe, China, or Russia because:

A) Immunizations are given but are poorly documented.
B) Immunization administration intervals are not appropriate.
C) The strength of immunization given may stimulate adequate antibodies.
D) Storage facilities are adequate.