In the present study, with a view to introducing a new marker as a dia
gnostic aid for neonatal sepsis, Interleukin 6 (IL-6) was measured in
a group of healthy, full-term and premature new-born infants and in an
other group of premature infants with suspected sepsis. In addition, t
o demonstrate that the cytokine studied does not penetrate the placent
al membrane, it was measured in a group of women during pregnancy, and
during labor, in the cord blood of their children at birth and during
their third day of life. The results we obtained confirmed the fact t
hat babies born at term or prematurely do not receive the molecule fro
m their mothers, but are capable of synthesising it early on by themse
lves. Abnormal values of IL-6 were found in 10 of the 36 babies with s
uspected sepsis. In these babies, sepsis was confirmed by clinical ele
ments and haemoculture. Only 3 patients presented high revels of IL-6;
of these, one died and a positive result was obtained from haemocultu
re for the other two. Realistically, as demonstrated in the adult, the
amount of cytokine is only relevant in cases of serious, systemic inf
ections complicated by septic shock.