Treatment of Cryptosporidiosis
Condition: Cryptosporidiosis
MeSH terms: Cryptosporidiosis
Study type: Interventional

Summary: 
      Background:

        1. Burden:

           Cryptosporidiosis among the top 10 causes of diarrhea in the 1st year of life in low and
           middle-income countries (LMICs), with an estimated total of 48,000 annual deaths and
           accounting for 4.2 million disability-adjusted life years lost.

        2. Knowledge gap:

      The only approved drug for the treatment of diarrhea caused by Cryptosporidium infection is
      Nitazoxanide (NTZ) but NTZ has a higher failure rate in malnourished children. The lack of
      effective therapy for cryptosporidiosis remains an immense knowledge gap in the efforts to
      improve childhood health worldwide.

      Hypothesis:

      NTZ treatment failure in malnourished infants is due to a secondary immune deficiency that
      can be reversed by the appropriate therapeutic treatment. Lactobacillus reuteri DSM 17938 can
      have a potential immune modulating effect by altering gut microbiome promoting NTZ action.

      Objectives:

      Primary:

      • To develop new approaches to treat and prevent cryptosporidiosis

      Secondary:

        -  Determination of the treatment outcome of NTZ against cryptosporidiosis in Bangladeshi
           children.

        -  Determination of the change in effectiveness of NTZ treatment in conjunction with the
           administration of probiotics in malnourished Bangladeshi children with cryptosporidiosis

      Methods:

      This will be a prospectively conducted randomized pilot study with 2 arms in children in the
      Mirpur (Dhaka, Bangladesh) slum area, where cryptosporidium infected children will receive
      Nitazoxanide treatment with or without the probiotic, Lactobacillus reuteri DSM 17938.

      Outcome measures/variables:

      The significance of the work lies in the ability of the study to provide new approaches to
      treat and prevent Cryptosporidiosis. The goal of this work is to assess the efficacy of NTZ
      drug in a low socioeconomic Bangladeshi population and establish new supportive therapeutic
      measures to the already established treatment with NTZ against in cryptosporidiosis.
    

Detailed description: 
      Background: Reports from longitudinal birth cohort study at Bangladesh show that 77% of
      children experience at least one incidence of cryptosporidiosis in the first two years of
      life. Cryptosporidiosis is also associated with the development of malnutrition leading to an
      estimate of an additional 4.2 million disability adjusted life years lost. A number of
      studies on cryptosporidiosis conducted at icddr,b showed that Cryptosporidium sp. was one of
      the most important causative agents of diarrhea associated with morbidity and mortality.
      Previous studies at icddr,b also made a number of other intriguing elucidations, which
      include:

        1. Cryptosporidium sp. infected most children in the 1st year of life in a cohort at
           Mirpur, Dhaka. Investigators observed that up to 64% of infants were diagnosed with
           cryptosporidiosis in the 1st year of life while 26% of these cases had accompanying
           co-infections.

        2. Cryptosporidium sp. was established as a top 10 diarrheal pathogen, with infections
           occurring with multiple other enteropathogens. Investigators discovered that infection
           and diarrhea with multiple entero-pathogens in infants in an LMIC setting was the norm,
           without any exception. On average each infant in Mirpur, Bangladesh had 3-5 enteric
           pathogens present in their stool at any a single time point.The importance of
           Cryptosporidium as a leading cause of infant diarrhea was validated by the MAL-ED study
           conducted across 8 different low to middle income sites.

        3. Diarrhea due to Cryptosporidium in the first year of life was independently associated
           with the future development of malnutrition.

        4. Impaired neurocognitive development at two years of age for infants with history of
           cryptosporidiosis as measure using the Bayley's scales of infant development.

      Currently, there is no effective vaccine for cryptosporidiosis and the only approved drug for
      the treatment of diarrhea caused by Cryptosporidium infection is nitazoxanide (NTZ)(U.S.
      DEPARTMENT OF HEALTH AND HUMAN SERVICES 2003). NTZ is the only treatment but its efficacy in
      controlled clinical trials has varied widely. While this drug has been generally shown to
      have an efficacy of >80%, in previous studies involving malnourished Zambian children it was
      shown to have an efficacy of only 56%. An effective therapy would be appealing for
      cryptosporidiosis in children in the developing world where the burden of infection is high
      and where persistence of the enteropathogen in the absence of diarrhea is associated with
      malnutrition.

      Although the exact reason for NTZ exhibiting a higher failure rate in malnourished children
      is unclear, this drug has been shown to inhibit the pyruvate-ferredoxin oxidoreductase of
      parasites and anaerobic bacteria but its effectiveness in combating cryptosporidiosis is
      dependent on the host immune competence. The gut micro-environment is a key component of the
      host response to environmental challenge, with the gut microbiota being postulated to mediate
      integral roles in promoting and calibrating all aspects of the immune system. Fermented
      products (such as yogurt) have long been thought to promote health. However, in most
      commercial food products the levels of the beneficial microorganisms or probiotics are not
      consistent and at lower levels than required for the desired biological effect. Lactobacillus
      reuteri DSM 17938 has been one of the most extensively studied probiotic in children and
      adults with functional gastrointestinal disorders. Lactobacillus reuteri DSM 17938 in
      particular would be effective against cryptosporidiosis due to the presence of both
      microorganisms at duodenum of human. A recent study at icddr, b has shown this commonly used
      probiotic appeared safe and well-accepted by Bangladeshi families. Lactobacillus reuteri has
      been tested in clinical trials and has attained the "GRAS (generally regarded as safe)"
      status for use in both children and adults and has additionally demonstrated immunomodulatory
      activities. This probiotic is thus hypothesized to act as a beneficial supplement to the NTZ
      treatment in cryptosporidiosis through a potential reduction in the gut inflammation
      resulting from Cryptosporidium infection. Additionally, if the microbiota treatment promotes
      parasite clearance and decrease the burden, it will be associated with faster disease
      resolution and better clinical outcomes. Lactobacillus reuteri DSM 17938 has been reported to
      inhibit the RORa/y activity to suppress Th17 cells, thus promoting an appropriate immune
      response in improving the efficacy of the drug treatment. The Probiotic VSL#3 which contains
      Lactobacillus reuteri DSM 17938 as well as other bacteria with anti-inflammatory activities
      has been shown to reduce the severity of inflammatory diarrhea in animal models and has been
      included as one of the treatment options for pouchitis by the British Society of
      Gastroenterology. Investigator's goal in this study is to undertake an iterative approach to
      improve and optimize the currently used most effective treatment regime against
      cryptosporidiosis.

      Experimental Design and Methodology:

      The objectives of the study are to investigate 1) Determine the incidence of
      Cryptosporidiosis 2) Assessment of the acquired immune response to Cryptosporidiosis and 3)
      Analyze the human genes influencing susceptibility to Cryptosporidiosis. The proposed study
      will utilize the field setting of the parent study. This proposed pilot study will help to
      elucidate the effective treatment for cryptosporidiosis which will not only help the study
      participants of the parent study, but also help other individuals with cryptosporidiosis from
      similar settings. Later on the parent study findings will provide information which will help
      to investigate host immune mechanism and permit the design of new strategies incorporating
      host-directed therapies that could optimize an appropriate immune response improving the
      efficacy of the NTZ with probiotics treatment.

      Study products: Nitazoxanide will be purchased from local commercial Square pharmaceuticals
      Ltd. and probiotics will be purchased from Bio Gaia a Swedish health care company.

      Study details: This will be a randomized clinical trial to be conducted prospectively in a
      pilot scale. The study will be conducted at Mirpur (Dhaka, Bangladesh) slum areas. The parent
      organization maintains a field site for studies on cryptosporidiosis. This is an area with a
      high incidence of both cryptosporidiosis and child malnutrition. Identified participants will
      be screened by strict maintenance and following of the inclusion and exclusion criteria. The
      study staff will take consent from the patient's legal guardian to enroll the child.
      Investigators will screen 975 children presenting age 12 months to 36 months, of either sex
      and having no history of antibiotic use in the last month before enrollment. The prevalence
      of Cryptosporidium infection in the proposed age group in that community is approximately 8%.
      Investigators will enroll 78 participants with cases of Cryptosporidiosis, diagnosed using
      animmune assay from stool. Investigators will enroll both symptomatic and asymptomatic
      children. Study physician will collect all the demographic, socioeconomic, anthropometric,
      clinical and treatment information. A random number generator will be used to determine which
      treatment group to which the child will be assigned. Stool and anthropometric information
      will be collected from all groups onenrollment, on day 4 (day after NTZ treatment), on day 8
      (day after Probiotics treatment), on day 90 (follow-up on 3 months) and on day 180 (follow-up
      on 6 months). Rate of decrease of oocyst load by qPCR in stools at Days 4 and day 8 will be
      tested.

      Study Schedule: Complete study schedule details listed by study visit are described below.

      Enrollment

        -  Taking of informed consent

        -  Anthropometric measurement

        -  Enrollment questionnaire

        -  Stool collection for immune assay of the detection of cryptosporidiosis and quantitative
           PCR for the baseline parasites load

      Start of Intervention (Day 1)

        -  Review of eligibility of enrollment

        -  Anthropometric measurement

        -  Start the intervention

      Visit Day 2 and 3

        -  Administration of intervention

        -  Screening for adverse events

      Visit Day 4

        -  Administration of intervention

        -  Screening for adverse events

        -  Stool collection for q PCR

      Visit Day 5, 6 and 7

        -  Administration of intervention

        -  Screening for adverse events

      Visit Day 8

        -  Screening for adverse events

        -  Stool collection for q PCR

      Visit Day 20

        -  Screening for adverse events

        -  Stool collection for q PCR

      Follow up visit day 90 and 180

        -  Anthropometric measurement

        -  Stool collection

      Intervention:Child will be randomly selected to receive either the NTZ treatment for 3 days
      with probiotics for 7days or the NTZ treatment for 3 days with placebo for 7days or to
      receive the standard supportive care normally provided for Cryptosporidium infections. The
      doses of NTZ will be twice a day for 3 days and L reuteri DSM 17938 will be 2×10^8 CFU will
      be taken orally. Treatment group will receive 5 drops probiotic twice daily for a consecutive
      7 days and placebo group will receive NTZ for 3 days without probiotic. The NTZ dosage will
      be 5 ml every 12 hours with food. The NTZ oral suspension contain 100mg/5ml.

      This drug NTZ and probiotics usually has no side effects. Prior study suggests no adverse
      event or serious adverse event.

      Expected drop-out: From previous experience the drop-out rate is very low. Investigator
      considered 10% drop out in each group.

      Sample size: This will be a pilot study with a total of 105 patients distributed equally
      across the three above mentioned study arms. A sample size of N = 105 individuals (35 in each
      of the groups) will be sufficient to detect a clinically important difference of the
      proportion (at least) 24% between the groups, using a two-sided Z-test of the difference
      between proportions with 80 % power and a 5 % level of significance and a precision of 0.10.
      This 24 % difference represents the difference between the prevalence of 56% in the
      NTZ+placebo group and 80 % in the NTZ+probiotics group. With consideration of 10% attrition
      rate, the total sample size is 117 individual (39 in each group). Since this is a pilot study
      and due to small funding, the precision value considered 0.10.

      Data analysis plan: Database will be created after getting the lab test values. Data will be
      analyzed using SPSS (version 16). Treatment efficacy will be measured in three groups. Nature
      of data distribution will be checked whether it is normally distributed or not. Using two
      sample mean test among group will be compared using parametric (t-test) or non-parametric
      (Mann-Whitney test) where applicable. Investigator will be examined, if there is any
      difference in cryptosporidium infection outcome of treatment with NTZ+placebo in comparison
      NTZ+probiotics treatment in children and then paired parametric-test or paired non-parametric
      test will be done depending on data distribution. Investigator will also examine the
      treatment effectiveness in malnourished children. Multivariate logistic regression will be
      performed to examine the effect of socioeconomic condition, nutrition and other clinical
      conditions associated with different treatment on cryptosporidiosis.
    

Intervention name(s): Nitazoxanide with Lactobacillus Reuteri DSM 17938; Nitazoxanide
Intervention type(s): Other; Other
Intervention description(s): Nitazoxanide with probiotics; Nitazoxanide with placebo
Intervention MeSH terms: Nitazoxanide
Allocation: Randomized
Intervention model: Parallel Assignment
Intervention model description: This will be a prospectively conducted randomized pilot study with 3 arms in children, where cryptosporidium infected children will receive Nitazoxanide treatment with or without the probiotic, Lactobacillus reuteriDSM 17938 and the third arm will receive the standard supportive care normally provided for Cryptosporidium infections.
Masking: Double (Participant, Care Provider)
Primary purpose: Treatment
Keywords: Cryptosporidiosis; Treatment; Bangladesh; Nitazoxanide