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An experimental study to characterize the effectiveness of griseofulvin against early falciparum malaria blood stage infection in healthy volunteers
An experimental study to characterize the effectiveness of griseofulvin against early plasmodium falciparum blood stage infection in healthy volunteers
Secondary ID 
Universal Trial Number (UTN)
Studies of infection and infectious agents
Description of intervention(s) / exposure
This is a single-center, randomized controlled, study using induced blood stage malaria (IBSM) infection to characterize the effectiveness of griseofulvin as a potential treatment of early Plasmodium falciparum blood stage infection in healthy volunteers.
All participants receive a malaria inoculum injection of ~ 1,800 viable P. falciparum-infected human erythrocytes on Day 0. The study will be conducted in 2 cohorts (n= 6 in each, consisting of 2 control subjects and 4 experimental subjects) using different oral tablet doses of griseofulvin in each of the cohorts. As a stratergy to monitor adherence to the treatment tablet will be administered under direct observation followed by ingestion of food. The experimental subjects enrolled in the experimental arm of cohort 1 (n=4) will be given 1g of griseofulvin administered in two doses of 500 mg each one in the morning (AM) and one in the Evening (PM) for 4 days, beginning on Day 6. Experimental Subjects enrolled in Cohort 2 (n=4) will be administered a single dose of 2000 mg of griseofulvin on Day 6. Control arm subjects in both cohort 1 (n=2) and cohort 2 (n=2) will be treated with Mefloquine once their parasitemia reaches the target level of 1,000 parasites/ml.
Intervention code 
Comparator / control treatment
Control subjects in both cohorts 1 and 2 (n=2 each) will receive a single dose of 10 mg/kg in an oral tablet form once the threshold for commencement of treatment is reached (= 1000 parasites/ml) as determined by PCR quantification
Primary outcome 
To characterize the pharmacodynamic effect of griseofulvin on the growth of Plasmodium falciparum parasites in healthy volunteers following infection with blood stage parasites.
Assessed though PCR and PK analysis of blood samples
PCR blood samples Time point: Day 0, 4-13 & 28 days
PK sampling Time point: Day 7-13
Secondary outcome 
To assess the tolerability of griseofulvin in the experimental human malaria challenge system.
Assessed though history and physical examination, and blood sampling for biochemistry and haematology
Biochemistry and haematology Time point: Day 0, 6. 7-13, 28
Physical examination. Time point: Day 0 4-5, 6, 7-13, 28
Key inclusion criteria
1. Volunteers will be adults (males or non pregnant females), aged between 18 and 45 years who do not live alone (from Day 1 until at least the end of the antimalarial drug treatment).
2. Volunteers must have a BMI within the range 18–30 kg/m2 and must weigh more than 50kg in adults in which the proposed dose has already been used.
3. Volunteers must understand the procedures involved and agree to participate in the study by giving fully informed, written consent.
4. Be contactable and available for the duration of the trial and be available up to 2 weeks following end of study visit. (maximum of 8 weeks).
5. Volunteers must be non-smokers for at least three months prior to screening.
6. This study will only be conducted in healthy male volunteers (that do not plan father children in the next 6 months) and female volunteers of non-childbearing potential (i.e. those who have had a hysterectomy, bilateral oophorectomy or tubal ligation or who are post-menopausal). As a precautionary measure, pregnancy testing will be conducted at screening on all eligible females, at the baseline assessment prior inoculation, prior to dosing and at the end of the study.
7. Good peripheral venous access.
Both males and females
Can healthy volunteers participate?
Key exclusion criteria
1. History of malaria
2. Evidence of increased cardiovascular disease risk (defined as greater than 10%, 5 year risk) as determined by the method of Gaziano et al.,
3. History of splenectomy.
4. SLE (systemic lupus erythematosus)
6. Pregnant or breast feeding
7. Men who may father children in the next six months
8. History of a severe allergic reaction, anaphylaxis or convulsions following any vaccination or infusion.
9. Presence of current or suspected serious chronic diseases or psychiatric illness
10. Volunteers unwilling to defer blood donations to the ARCBS for 6 months.
11. Known pre-existing prolongation of the QT interval or clinically significant
electrocardiogram (ECG) abnormalities
12. Recent or current therapy with an antibiotic or drug with potential antimalarial activity (tetracycline, azthromycin, clindamycin, hydroxychloroquine etc.).
13. Known hypersensitivity to griseofulvin, Mefloquine, artemether or lumefantrine.
14. Concomitant use of any drug which is metabolised by the cytochrome enzyme CYP2D621. Use of corticosteroids, anti-inflammatory drugs, any immunomodulators or anticoagulants.
15. Presence of acute infectious disease or fever (e.g., sub-lingual temperature 38.5 degrees Celsius) within the five days prior to study product administration).
16. Evidence of acute illness within the four weeks before trial prior to screening.
17. Significant intercurrent disease of any type, in particular liver, renal, cardiac, pulmonary,
neurologic, rheumatologic, or autoimmune disease by history, physical examination, and/or
laboratory studies including urinalysis.
18. Participant has a clinically significant disease or any condition or disease that might affect drug absorption, distribution or excretion, e.g. gastrectomy, diarrhoea.
19. Alcohol consumption greater than community norms (i.e. more than 21 standard drinks per week for males and 14 standard drinks per week for females).
20. Currently consuming a low fat diet.
21. A history of drug habituation, or any prior intravenous usage of an illicit substance.
22. Participation in any research study involving significant blood sampling, or blood donation to Red Cross (or other) blood bank during the 8 weeks preceding the reference drug dose in the study.
23. Have ever received a blood transfusion.
24. Positive test for HIV, Hepatitis B, hepatitis C.
25. Any clinically significant biochemical or haematologic abnormality (Hb must be greater than or equal to 11.5g/dL for females; 13.0g/dL for males)– including red cell antibodies
26. Evidence of any condition that, in the opinion of the clinical investigator, might interfere with the evaluation of the study objectives or pose excessive risks to volunteers.
27. Any circumstances or conditions, which, in the opinion of the PI, may affect full participation in the trial or compliance with the protocol.
Allocation to intervention
Randomised controlled trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment
Following screening participants will be randomized into the study using a pre-designed randomization code using sealed opaque envelopes.
Methods used to generate the sequence in which subjects will be randomised (sequence
Simple randomisation will be undertaken using a randomisation table created by computer software (i.e. computerised sequence generation).
Masking / blinding
Open (masking not used)
Who is / are masked / blinded?
Type of endpoint(s)
Pharmacokinetics / pharmacodynamics
Statistical methods / analysis
Descriptive statistical analysis, combined with analysis of parasite growth rate.
This is an explorato