The Lancet  
May 21, 2011  Volume 377  Number 9779  Pages 1719 – 1806
http://www.thelancet.com/journals/lancet/issue/current

Articles
Long-term protection against malaria after experimental sporozoite inoculation: an open-label follow-up study
Meta Roestenberg, Anne C Teirlinck, Matthew BB McCall, Karina Teelen, Krystelle Nganou Makamdop, Jorien Wiersma, Theo Arens, Pieter Beckers, GeertJan van Gemert, Marga van de Vegte-Bolmer, André JAM van der Ven, Adrian JF Luty, Cornelus C Hermsen, Robert W Sauerwein

Preview
Artificially induced immunity lasts longer than generally recorded after natural exposure; providing a new avenue of research into the mechanisms of malaria immunity.