Investigations of the Gerbich blood group system in Melanesians of Papua/
New Guinea are described. Over 50% of members of certain population groups are
Gerbich negative, and anti-Gea (‘naturally-occurring’) is present in about 10% of Ge (a-)
people. The distribution of populations with high Ge (a-) incidence is not explicable at
present.
A Gerbich antibody (anti-Ge 1) with a new specificity has been investigated, and the
following phenotypes are now distinguishable: Ge 1, 2, 3 (some Melanesians and almost
all others), Ge -1, 2, 3 (some Melanesians), Ge -1, -2, 3 (‘Yus’ type, not found in Melanesians),
Ge -1, -2, -3 (Gerbich negatives).