The present application relates to a sub-region of a Plasmodium
protein, with improved vaccine potential, and to medical uses thereof, notably for treatment or
diagnosis of malaria. The present invention notably provides unstructured or unfolded polypeptides deriving from the PFF0165
c protein of P. falciparum 3D7. The polypeptides of the invention have a high anti-genicity, a high
immunogenicity, have a high parasite-killing activity in the ADCI
assay, and are strongly associated with clinical protection against
malaria, and. The present invention thereby provides a vaccine for the palliative and / or
curative treatment of
malaria, which is specifically intended for infants, toddlers, children under the age of 5, pregnant women.