The mass childhood immunization programme has traditionally been viewe
d as a safe and effective preventative measure by health promoters, pr
imary health care professionals and governments. This consensus has me
ant that immunization has rarely been viewed as ethically problematic.
A number of recent changes in the context of the delivery of health c
are, particularly the emphasis on consumerism and the effect of the ma
rketization of services, makes timely an examination of ethical, socia
l and political issues. This article examines four main groups for pro
blematizing the mass childhood immunization programme. These are: clin
ical research evidence about the safety and efficacy of vaccines; the
masking of wider social and political determinants of ill health; the
contradictory strictures about collective and individual rights in rel
ation to immunization; and the uniqueness of childhood immunization as
a physical intrusion into a healthy body. The implications of these e
thical issues are discussed in relation to informed consent and the ne
ed for a 'greenfield' review that includes the views of dissenting par
ents, lawyers and moral philosophers, as well as health professionals.