TNF and tetanus: Another study from the same registry, found no difference in adequate antibody titers to Hib and tetanus between infants exposed or unexposed to anti-TNFα in utero; 71% of exposed (n = 41) and 50% of unexposed (n = 8), 80% (n = 8) and 75% (n = 8) of exposed and unexposed children, respectively (11).