Since 1998 a highly successful Controlled Human Malaria Infection model at the UMC St Radboud, Nijmegen, The Netherlands, has been employed both to test candidate vaccines and to answer fundamental questions about pathophysiological and immunological mechanisms during early Pf infection in human volunteers. To date largely the NF54 strain of P. falciparum has been used in this Nijmegen model, with which extensive experience has meanwhile been acquired. In order to increase the portfolio of Pf strains available for future phase IIa studies, we recently compared NF54 to the novel candidate strains NF135.C10 and NF166.C8 with regards to parasitological, clinical and immunological characteristics during a Controlled Human Malaria Infection (TIP3 study, NCT01627951). The pre-patent period in all NF135- and NF166-infected subjects was markedly shorter than in NF54-infected subjects, following the bites of 5 infected mosquitoes on each subject. The current study will therefore assess whether NF135 and NF166 infections can still reliably be induced with fewer than 5 infected bites per subject. This will envisionably increase the tolerability of NF135 and NF166 infections and render their dynamics more similar to those of NF54 infections, for better comparison in future heterologous challenge studies.