Vaccines for women to prevent neonatal tetanus
Demicheli V, Barale A, Rivetti A
This review should be cited as: Demicheli V, Barale A, Rivetti A. Vaccines for women to prevent neonatal tetanus (Cochrane Review). In: The Cochrane Library, Issue 4, 2007. Oxford: Update Software.
A substantive amendment to this systematic review was last made on 15 August 2005. Cochrane reviews are regularly checked and updated if necessary.

Abstract
Background
Tetanus is an acute, often fatal, disease caused by an exotoxin produced by Clostridium tetani. It occurs in newborn infants born to mothers who do not have sufficient circulating antibodies to protect the infant passively, by transplacental transfer. Prevention may be possible by the vaccination of pregnant or non-pregnant women, or both, with tetanus toxoid, and the provision of clean delivery services. Tetanus toxoid consists of a formaldehyde-treated toxin which stimulates the production of antitoxin.
Objective
To assess the effectiveness of tetanus toxoid, administered to women of childbearing age or pregnant women, to prevent cases of, and deaths from, neonatal tetanus.
Search strategy
We searched the Cochrane Pregnancy and Childbirth Group's Trials Register (July 2007), The Cochrane Library (2007, Issue 2), MEDLINE (1966 to June 2007), EMBASE (1974 to June 2007). We also used the results from handsearching and consultations with manufacturers and authors.
Selection criteria
Randomised or quasi-randomised trials evaluating the effects of tetanus toxoid in pregnant women or women of childbearing age on numbers of neonatal tetanus cases and deaths.
Data collection and analysis
Three review authors independently assessed trials for inclusion and trial quality, and extracted data.
Main results
Two trials (10,560 infants) were included. One study (1919 infants) assessed the effectiveness of tetanus toxoid in preventing neonatal tetanus deaths. After a single dose, the relative risk (RR) was 0.57 (95% confidence interval (CI) 0.26 to 1.24), and the vaccine effectiveness was 43%. With a two or three dose course, the RR was 0.02 (95% CI 0.00 to 0.30); vaccine effectiveness was 98%. No effect was detected on causes of death other than tetanus. The RR of cases of neonatal tetanus after at least one dose of tetanus toxoid was 0.20 (95% CI 0.10 to 0.40); vaccine effectiveness was 80%. Another study, involving 8641 children, assessed the effectiveness of tetanus-diptheria toxoid in preventing neonatal mortality after one or two doses. The RR was 0.68 (95% CI 0.56 to 0.82); vaccine effectiveness was 32%. In preventing deaths at 4 to 14 days, the RR was 0.38 (95% CI 0.27 to 0.55), and vaccine effectiveness 62% (95% CI 45% to 73%).
Reviewers' conclusions
Available evidence supports the implementation of immunisation practices on women of childbearing age or pregnant women in communities with similar, or higher, levels of risk of neonatal tetanus, to the two study sites. More information is needed on possible interference of vaccination by malaria chemoprophylaxis on the roles of malnutrition and vitamin A deficiency, and on the quality of tetanus toxoid production and storage.