Many parasites vary their surface molecules to avoid the host's immune response, thereby perpetuating long-term infections. Disrupting this process in the intestinal parasite Giardia lamblia now provides a useful tool for vaccination (pages 551–557).
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Deitsch, K. Calling all antigens. Nat Med 16, 522–523 (2010). https://doi.org/10.1038/nm0510-522
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DOI: https://doi.org/10.1038/nm0510-522