A Study to Evaluate Antimalarial Activity and Safety of MK-7602 in Healthy Adults (MK-7602-003)

The main inclusion and exclusion criteria include but are not limited to the following:

Inclusion Criteria:

• Is in good health
• Has a body mass index (BMI) between 18 and 32 kg/m2, inclusive
• For participant assigned male sex at birth: If capable of producing sperm, participant must agree to the following during the study treatment period and for at least 90 days after the last dose of MK-7602: Refrain from donating sperm, plus EITHER be abstinent OR must agree to use male condom plus additional contraceptive method
• For participant assigned female sex at birth: EITHER be a person of nonchildbearing potential (PONCBP) OR must use a highly effective contraceptive method or be abstinent during the intervention period and for at least 10 days after the last dose of study intervention
• Must provide confirmation of not living alone (at any stage from inoculation day until the end of the study). A participant who lives alone may be included on a case-by-case basis.
• Agrees to refrain from eating food containing poppy seeds for 48 hours prior to screening, malaria inoculation, and MK-7602 administration

Exclusion Criteria:

• History of clinically significant clinically significant endocrine, gastrointestinal (GI), cardiovascular, hematological, hepatic, immunological, renal, respiratory, genitourinary, or major neurological (including stroke and chronic seizures) abnormalities or diseases
• Is mentally or legally incapacitated or has a history of clinically significant psychiatric disorder
• History of cancer (malignancy)
• History of malaria
• History of splenectomy
• History of ever receiving a blood transfusion
• History of recurrent headache (eg, tension-type, cluster or migraine) with a frequency of ≥2 episodes per month on average and severe enough to require medical therapy, during the 5 years preceding the screening visit
• History of convulsion (including intravenous drug or vaccine-induced episodes). A medical history of a single febrile convulsion during childhood is not considered an exclusion criterion.
• Has presence of clinically significant infectious disease or fever (eg, sublingual temperature ≥38.5 degrees Celsius) within the 5 days prior to inoculation
• Has evidence of acute illness within the 4 weeks prior to screening that the Investigator deems may compromise participant safety
• Has clinically significant disease or any condition or disease that might affect drug absorption, distribution, or excretion (eg, gastrectomy, diarrhea)
• Has a medical requirement for intravenous immunoglobulin or blood transfusions
• Has had a major surgery with more than 470 mL of blood loss, lost 1 unit of blood (approximately 470 mL) or undergone blood donation of any volume to the Australian Red Cross Blood Service (Blood Service) or other blood blank within 4 weeks prior to the prestudy screening visit) or during the 8 weeks prior to inoculation
• Has used any corticosteroids, anti-inflammatory drugs (excluding commonly used over-the-counter anti-inflammatory drugs such as ibuprofen, acetylsalicylic acid, diclofenac), immunomodulators or anticoagulants within the past three months
• History of receiving immunosuppressive therapy (including systemic steroids, adrenocorticotrophic hormone, or inhaled steroids) at a dose or duration potentially associated with hypothalamic-pituitary-adrenal axis suppression within the past year from the screening visit
• Has had any vaccination within the last 28 days
• Has participated in another investigational study within 12 weeks (or 5 half-lives, whichever is greater) prior to the prestudy (screening) visit
• History of participation in a previous malaria challenge study or malaria vaccine study.
• Must not have had malaria exposure that is considered by the principal investigator or their delegate to be significant