Amoxicillin is recommended by the World Health Organization (WHO) as adjunctive therapy for the treatment of uncomplicated severe acute malnutrition (SAM). Because children with uncomplicated SAM may have asymptomatic infection due to immune suppression, presumptive treatment with a broad-spectrum antibiotic may be beneficial by clearing any existing infection and improving outcomes. Two randomized placebo-controlled randomized trials have evaluated amoxicillin for uncomplicated SAM and have found conflicting results. These results may indicate either that antibiotics are not helpful for the management of uncomplicated SAM, or that a better antibiotic is needed. Recently, the investigators demonstrated that biannual mass azithromycin distribution as a single oral dose reduces all-cause child mortality in sub-Saharan Africa. Children with uncomplicated SAM, who have an elevated risk of mortality relative to their well-nourished peers, may particularly benefit from presumptive azithromycin treatment. Our pilot data demonstrated feasibility in rapid enrollment of children with uncomplicated SAM in our study area, and showed no significant difference between azithromycin and amoxicillin, demonstrating equipoise for a full-scale trial. Here, the investigators propose an individually randomized trial in which children will be randomized to a) azithromycin, b) amoxicillin, or c) placebo, and evaluated for differences in weight gain, nutritional recovery, and the gut microbiome. The results of this study will strengthen the evidence base for policy related to the use of antibiotics as part of the management of uncomplicated SAM, including additional evidence of amoxicillin versus placebo as well as evaluation of an antibiotic class that has not been considered for uncomplicated SAM, which may lead to changes in guidelines for treatment.

General study design. The investigators propose a 1:1:1 individually randomized placebo-controlled trial in which children aged 6-59 months with SAM (based on weight-for-height Z-scores (WHZ) and/or mid-upper arm circumference (MUAC), defined in Eligibility) are randomized to one of three study arms: 1) a single oral 20 mg/kg dose of azithromycin followed by 13 doses of placebo; 2) a 7-day twice-daily course of oral amoxicillin (14 total doses); or 3) 7 days of twice-daily placebo (14 total doses). Children will be followed weekly until nutritional recovery, and then at 8 weeks (primary outcome), and 3, 6, 9, and 12 months to assess relapse and vital status. The primary outcome will be weight gain in g/kg/day at 8 weeks from enrollment. Children in all groups will receive ready-to-use therapeutic food per standard of care guidelines (described below).

Study area and study team. This study will be conducted in Boromo District, Burkina Faso in West Africa. Boromo is in central Burkina Faso and experiences a large burden of SAM annually. As in much of the Sahel, food insecurity and malnutrition are highly seasonal, with the malnutrition season aligning with the rainy season from approximately July through October, prior to the annual harvest in November to December. The central Sahel, which includes Burkina Faso, is a particularly vulnerable region for childhood malnutrition due to seasonal food insecurity, ongoing political instability, and climate change which may alter or shorten growing seasons. The COVID-19 pandemic has increased risk of poor nutritional outcomes among children, particularly in already vulnerable settings. The Sahel, and Burkina Faso in particular, is a critical region for nutritional interventions due to the continued high prevalence of underweight and high mortality rates, and lack of progress in reducing underweight in children. Previous evidence has suggested that the etiology of SAM varies across sub-Saharan Africa, and that SAM in the Sahel may be more likely due to calorie insufficiency (marasmus) compared to other regions that have a higher prevalence of protein malnutrition (kwashiorkor). Amoxicillin has been hypothesized to have greater efficacy in children with kwashiorkor vs marasmus, which may partially explain discrepant results in amoxicillin trials from Malawi and Niger. Given the large burden of malnutrition in the Sahel, evidence tailored specifically to this setting is critical to inform policy. The trial will be conducted jointly by the University of California, San Francisco (PI: Dr. Catherine Oldenburg) and the Centre de Recherche en Santé de Nouna (PI: Dr. Ali Sié). Our team has collaborated on multiple randomized controlled trials for child health since 2016. In addition to expertise in design, conduct, and analysis of antibiotic trials, our team has extensive expertise in pediatric microbiome and resistome outcomes in antibiotic trials (led by Dr. Thuy Doan).

Enrollment facilities. Our pilot study was conducted in 6 health facilities in Boromo over a single malnutrition season. For the full trial, the investigators propose to expand to 18 primary healthcare facilities and enroll over a 3-year period (covering 3 malnutrition seasons). These facilities represent the first tier of the country's government-run healthcare system and provide basic preventative and curative care and are often nurse-led.

Healthcare for children under 5 years of age attending public facilities is free of charge. Primary care facilities typically provide outpatient treatment of common childhood illnesses, vaccination clinics, and antenatal and maternity care. Each facility hosts a nutrition clinic 1-2 days/week during which children are screened and receive care for uncomplicated SAM on an outpatient basis. Children with a clinical complication requiring inpatient treatment will be referred to the local district hospital for treatment and will not be enrolled in the trial. Children in the outpatient nutritional program receive weekly follow-up care, although rates of default outside of trial settings are high. These facilities are typically under-resourced and experience frequent stock-outs of key components of the outpatient SAM treatment package (e.g., RUTF). All enrolled children will receive all components of outpatient SAM package through the trial.

The investigators propose a 1:1:1 randomized double masked placebo-controlled trial to determine whether a single oral dose of azithromycin is superior to 1) amoxicillin or 2) placebo for weight gain in children with SAM. Children aged 6-59 months with SAM per Burkinabé national guidelines will be randomized to one of three study arms and followed for 12 months, with the primary outcome being weight gain (g/kg/day) at 8 weeks after enrollment in the study. Children will be followed weekly until recovery, at 8 weeks, and then every 3 months to assess for relapse and mortality.

Children with uncomplicated SAM per Burkina Faso's national guidelines who present to an eligible enrollment site during the study period and meet all of the eligibility criteria below will be considered for enrollment:

Inclusion criteria:

• Age 6-59 months
• WHZ<-3 SD or MUAC<115 mm
• Primary residence within a catchment area of an enrollment site
• Available for full 8-week study (primary endpoint)
• Not admitted to a nutritional program for SAM treatment in the previous 2 weeks
• No edema
• No antibiotic use in the past 7 days
• No clinical complications requiring antibiotic or inpatient treatment**
• No congenital abnormality or chronic debilitating illness that would lead to predictable growth faltering or reduce likelihood of SAM treatment benefit (such as cerebral palsy, Down syndrome, congenital heart disease, cleft lip/palate, etc)
• No known allergies to macrolides/azalides or amoxicillin/penicillin
• Sufficient appetite according to a feeding test with RUTF
• Written informed consent from at least one parent or guardian

Exclusion criteria:

• Age less than 6 month or more than 59 months

• WHZ>-3 SD or MUAC>115 mm

• Primary residence is not within a catchment area of an enrollment site

• Not Available for full 8-week study (primary endpoint)

• Admitted to a nutritional program for SAM treatment in the previous 2 weeks

• Edema

• Antibiotic use in the past 7 days

• Clinical complications requiring antibiotic or inpatient treatment**

• Congenital abnormality or chronic debilitating illness that would lead to predictable growth faltering or reduce likelihood of SAM treatment benefit (such as cerebral palsy, Down syndrome, congenital heart disease, cleft lip/palate, etc)

• Known allergies to macrolides/azalides or amoxicillin/penicillin

• No Sufficient appetite according to a feeding test with RUTF

• No Written informed consent from at least one parent or guardian

  • Per Burkinabé guidelines, children any of the following conditions will not be eligible for the trial and will be referred to an inpatient facility: MUAC <115 mm with complications; MUAC <115 mm plus edema; bipedal pitting edema; anorexia or no appetite for RUTF; diarrhea and dehydration; unable to ingest anything without vomiting; severe pneumonia; open cutaneous lesions; hypothermia (35*C); fever (38.5*C); paleness suggesting severe anemia; hypoglycemia; very weak, lethargic, or unconscious; convulsions; signs of vitamin A deficiency; or a condition requiring IV infusion or an NG tube.

The informed consent documents will contain language permitting secondary use with broad data sharing under controlled access with general use restrictions in GitHub. Any data shared will be de-identified. Participants will not be contacted or re-consented for future sharing or accessing data through repositories. Privacy and confidentiality protections will be consistent with applicable local laws in Burkina Faso. Data will be de-identified by removing all 18 HIPAA identifiers prior to sharing. All data sharing plans will be reviewed and approved by the respective institutional review boards at all participating institutions and will be reviewed during the informed consent process with caregivers. Caregivers may opt out of data sharing, for study data overall or specifically for biospecimen and/or genomic data.