Immunization With Plasmodium Falciparum Sporozoites Under Chloroquine or Chloroquine/Azithromycin Prophylaxis (MMV)
Malaria, Falciparum
About this trial
This is an interventional prevention trial for Malaria, Falciparum focused on measuring Malaria, P falciparum, Chloroquine, Azithromycin, Immunization
Eligibility Criteria
Inclusion Criteria:
- Age ≥ 18 and ≤ 35 years healthy volunteers (males or females)
- Good health based on history and clinical examination
- Negative pregnancy serum test
- For females who are sexually active: use of adequate contraception (incl. condom use)
- Signing of the informed consent form, thereby demonstrating understanding of the meaning and procedures of the study
- Agreement to inform the general practitioner and to sign a request to release medical information concerning contra-indications for participation in the study
- Willingness to undergo a Pf controlled infection through mosquito bites
- Agreement to stay in a hotel room close to the trial centre during a part of the study (Day 7 till day 15 after challenge)
- Reachable (24/7) by mobile phone during the whole study period
- Available to attend all study visits
- Agreement to refrain from blood donation or for other purposes, during the whole study period
- Willingness to undergo HIV, hepatitis B and hepatitis C tests
- Negative urine toxicology screening test at screening visit and the day before challenge
- Willingness to take a prophylactic regime of chloroquine or chloroquine/azithromycin combination and a curative regimen of Malarone® after challenge.
Exclusion Criteria:
- History of malaria
- Plans to travel to malaria endemic areas during the study period
- Plans to travel outside of the Netherlands during the challenge period
- History of stay in malaria endemic areas for more than 6 months
- Previous participation in any malaria vaccine study and/or positive serology for Pf
- Symptoms, physical signs and laboratory values suggestive of systemic disorders including renal, hepatic, cardiovascular, pulmonary, skin, immunodeficiency, psychiatric, and other conditions which could interfere with the interpretation of the study results or compromise the health of the volunteer
- History of diabetes mellitus or cancer (except basal cell carcinoma of the skin)
- History of arrhythmias or prolonged QT-interval
- Positive family history in 1st and 2nd degree relatives for cardiac events < 50 years old
- An estimated, ten year risk of fatal cardiovascular disease of ≥5%, as estimated by the Systematic Coronary Risk Evaluation (SCORE) system
- Clinically significant abnormalities in electrocardiogram (ECG) at screening
- Body Mass Index (BMI) below 18 or above 30 kg/m2
- Any clinically significant deviation from the normal range in biochemistry or haematology blood tests or in urine analysis
- Positive HIV, HBV or HCV tests
- Participation in any other clinical study within 30 days prior to the onset of the study
- Enrolment in any other clinical study during the study period
- Pregnancy or lactation for women
- Volunteers unable to give written informed consent
- Volunteers unable to be closely followed for social, geographic or psychological reasons
- History of (soft) drugs or alcohol abuse interfering with normal social function
- A history of treatment for psychiatric disease
- A history of epileptic insults in the volunteer
- Contra-indications for use of Malarone®, chloroquine or azithromycin. This includes hypersensitivity or treatment taken by the volunteer that interferes with mentioned study drugs.
- The use of chronic immunosuppressive drugs, antibiotics, or other immune modifying drugs within three months of study onset (topical corticosteroids and oral anti-histaminic are allowed) and during the study period
- Any confirmed or suspected immunosuppressive or immunodeficient condition, including (functional) asplenia
- Co-workers or trainees of the departments of Medical Microbiology, Parasitology, or Internal Medicine of the Leiden University Medical Centre
- A history of sickle cell anaemia, sickle cell trait, thalassemia, thalassemia trait or G6PD deficiency
Sites / Locations
- Leiden University Medical Centre
Arms of the Study
Arm 1
Arm 2
Arm 3
Active Comparator
Experimental
Placebo Comparator
CQ and falciparum immunization
CQ/AZM and falciparum immunization
CQ and AZM control
This arm will receive chloroquine prophylaxis, a placebo during immunizations and three times 5 infected mosquito-bites (immunizations). Standard Chloroquine prophylactic regime: a loading dose of 300 mg on day 1 and day 3 and then 300 mg once a week, starting on day 7, for a total duration of 13 weeks. Placebo capsules daily on three consecutive days starting on each of three immunization days. Challenge: Exposure to the bites of 5 Plasmodium falciparum infected mosquitoes. When thick smear positive, of at day 21 after challenge, a standard 3 day treatment of Malarone will be given.
This arm will receive chloroquine and azithromycin prophylaxis and three times 5 infected mosquito-bites (immunizations). Standard Chloroquine prophylactic regime: a loading dose of 300 mg on day 1 and day 3 and then 300 mg once a week, starting on day 7, for a total duration of 13 weeks. Azithromycin capsules 1000mg daily on three consecutive days starting on each of three immunization days. Challenge: Exposure to the bites of 5 Plasmodium falciparum infected mosquitoes. When thick smear positive, of at day 21 after challenge, a standard 3 day treatment of Malarone will be given.
This arm will receive chloroquine and azithromycin prophylaxis and three times 5 uninfected mosquito-bites during immunization. Standard Chloroquine prophylactic regime: a loading dose of 300 mg on day 1 and day 3 and then 300 mg once a week, starting on day 7, for a total duration of 13 weeks. Azithromycin capsules 1000mg daily on three consecutive days starting on each of three immunization days. Challenge: Exposure to the bites of 5 Plasmodium falciparum infected mosquitoes. When thick smear positive, of at day 21 after challenge, a standard 3 day treatment of Malarone will be given.