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Scientific rationale for study design of community-based simplified antibiotic therapy trials in newborns and young infants with clinically diagnosed severe infections or fast breathing in South Asia and sub-Saharan Africa.
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PMID:  23945577     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Newborns and young infants suffer high rates of infections in South Asia and sub-Saharan Africa. Timely access to appropriate antibiotic therapy is essential for reducing mortality. In an effort to develop community case management guidelines for young infants, 0-59 days old, with clinically diagnosed severe infections, or with fast breathing, 4 trials of simplified antibiotic therapy delivered in primary care clinics (Pakistan, Democratic Republic of Congo, Kenya and Nigeria) or at home (Bangladesh and Nigeria) are being conducted.
METHODS: This article describes the scientific rationale for these trials, which share major elements of trial design. All the trials are in settings of high neonatal mortality, where hospitalization is not feasible or frequently refused. All use procaine penicillin and gentamicin intramuscular injections for 7 days as reference therapy and compare this to various experimental arms utilizing comparatively simpler combination regimens with fewer injections and oral amoxicillin.
CONCLUSION: The results of these trials will inform World Health Organization policy regarding community case management of young infants with clinical severe infections or with fast breathing.
Anita K M Zaidi; Abdullah H Baqui; Shamim Ahmad Qazi; Rajiv Bahl; Samir Saha; Adejumoke I Ayede; Ebunoluwa A Adejuyigbe; Cyril Engmann; Fabian Esamai; Antoinette Kitoto Tshefu; Robinson D Wammanda; Adegoke G Falade; Adetanwa Odebiyi; Peter Gisore; Adrien Lokangaka Longombe; William N Ogala; Shiyam Sundar Tikmani; A S M Nawshad Uddin Ahmed; Steve Wall; Neal Brandes; Daniel E Roth; Gary L Darmstadt
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Pediatric infectious disease journal     Volume:  32 Suppl 1     ISSN:  1532-0987     ISO Abbreviation:  Pediatr. Infect. Dis. J.     Publication Date:  2013 Sep 
Date Detail:
Created Date:  2013-08-15     Completed Date:  2014-02-18     Revised Date:  2014-02-26    
Medline Journal Info:
Nlm Unique ID:  8701858     Medline TA:  Pediatr Infect Dis J     Country:  United States    
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Languages:  eng     Pagination:  S7-11     Citation Subset:  IM    
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MeSH Terms
Africa South of the Sahara
Anti-Bacterial Agents / administration & dosage*
Bacterial Infections / drug therapy
Community Health Services
Infant, Newborn
Infant, Newborn, Diseases / drug therapy*
Randomized Controlled Trials as Topic
Tachypnea / diagnosis,  drug therapy*,  microbiology
Treatment Failure
Grant Support
Reg. No./Substance:
0/Anti-Bacterial Agents

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Journal Information
Journal ID (nlm-ta): Pediatr Infect Dis J
Journal ID (iso-abbrev): Pediatr. Infect. Dis. J
Journal ID (publisher-id): INF
ISSN: 0891-3668
ISSN: 1532-0987
Publisher: Williams & Wilkins
Article Information
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Copyright © 2013 by Lippincott Williams & Wilkins
Print publication date: Month: 9 Year: 2013
Electronic publication date: Day: 26 Month: 8 Year: 2013
Volume: 32 Issue: Suppl 1 Innovative Treatment Regimens for Severe Infections in Young Infants
First Page: S7 Last Page: S11
PubMed Id: 23945577
ID: 3814626
ID: 00003
DOI: 10.1097/INF.0b013e31829ff5fc

Scientific Rationale for Study Design of Community-based Simplified Antibiotic Therapy Trials in Newborns and Young Infants With Clinically Diagnosed Severe Infections or Fast Breathing in South Asia and sub-Saharan Africa
Anita K. M. Zaidi, MB BS, SM*
Abdullah H. Baqui, MB BS, DrPH
Shamim Ahmad Qazi, MB BS, DCH, MSc, MD
Rajiv Bahl, MB BS, MD, PhD
Samir Saha, PhD§
Adejumoke I. Ayede, MB BS, MSc, FMCPaed
Ebunoluwa A. Adejuyigbe, MB ChB, FMCPaed
Cyril Engmann, MD, FAAP**††
Fabian Esamai, MB ChB, MMed, MPH, PhD‡‡
Antoinette Kitoto Tshefu, MD, PhD, MPH§§
Robinson D. Wammanda, MB BS, FWACP Paed¶¶
Adegoke G. Falade, MB BS, FMCPaed, MD, FRCP§
Adetanwa Odebiyi, MSc‖‖
Peter Gisore, MB ChB††
Adrien Lokangaka Longombe, MD§§
William N. Ogala, MB BS, FMCPaed, FWACP Paed¶¶
Shiyam Sundar Tikmani, MB BS*
A. S. M. Nawshad Uddin Ahmed, FCPS§
Steve Wall, MD***
Neal Brandes, MHS†††
Daniel E. Roth, PhD‡‡‡
Gary L. Darmstadt, MD, MS††
From the *Aga Khan University, Karachi, Pakistan; Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; Department of Maternal, Newborn, Child and Adolescent Health, World Health Organization, Geneva, Switzerland; Department of Pediatrics, College of Medicine, University of Ibadan, Ibadan, Nigeria; Department of Paediatrics and Child Health, Obafemi Awolowo University, Ile-Ife, Nigeria; **Departments of Pediatrics and Maternal Child Health, Schools of Medicine and Public Health, University of North Carolina, Chapel Hill, North Carolina; ††Bill and Melinda Gates Foundation, Seattle, Washington; ‡‡Department of Child Health and Paediatrics, School of Medicine, Moi University, Eldoret, Kenya; §§Department of Community Health, Kinshasa School of Public Health, Kinshasa, Demographic Republic of Congo; ¶¶Department of Paediatrics, Ahmadu Bello University Teaching Hospital, Ahmadu Bello University, Zaria, Nigeria; and ‖‖Department of Sociology, Obafemi Awolowo University, Ile-Ife, Nigeria; ***Save the Children/Saving Newborn Lives; †††United States Agency for International Development, Washington DC; and ‡‡‡Hospital for SickKids, Toronto, Canada.

Infections in the neonatal period are responsible for an estimated 12% of under-5 child mortality.1 Most newborns with severe infections (sepsis, pneumonia, meningitis) in South Asia and sub-Saharan Africa die without access to hospitalization and appropriate therapy,2–6 prompting the need for alternative strategies for home or first-level facility-based management in countries with a high burden of neonatal deaths.3–5,7 This article describes the scientific rationale for the study design of 3 randomized controlled equivalence trials evaluating simplified antibiotic regimens for management of clinically diagnosed severe infections in newborns and young infants in community settings in Bangladesh, Pakistan and a multicountry study in Africa (Democratic Republic of Congo, Kenya and Nigeria). Additionally, the scientific reasoning underlying a trial of simplified antibiotic therapy for management of young infants who present with fast breathing alone is also described. Although the individual study designs are adapted to site and country needs and are detailed in the site-specific methods articles,8–11 here we focus on the overarching scientific approach to case definitions, selection of trial sites, participant inclusion/exclusion criteria, choice of antibiotics and regimens and outcomes. The common design elements were made possible by extensive collaboration between the study sponsors12 and investigators and will enhance the interpretation and application of the studies’ results, in part by enabling future pooled analyses for outcomes of subgroups of interest (eg, treatment failure in newborns with early-onset infections, newborns with multiple clinical signs of illness vs. single signs, etc.).


Newborns have increased vulnerability to infection-related morbidity and mortality because of their immature immune systems and underdeveloped skin barrier.13 However, a decision to include infants beyond the newborn period, that is, in the second month of life, was made for 2 reasons. First, the newborn immune response matures on a gradient with age14 with increased susceptibility to infection persisting into the second month of life, and second, the current World Health Organization (WHO)/United Nations International Children’s Emergency Fund Integrated Management of Childhood Illness addresses children aged 0–59 days as a separate group (“young infants”) from children 2–59 months old.15 Therefore, any new case management strategy for use in developing countries needs to be applicable to infants who are 0–59 days old.


Infections in the newborn and young infant present with nonspecific signs and symptoms and can be difficult to diagnose even by experienced health professionals.13 A high index of suspicion and prompt initiation of antibiotic therapy are required to save lives because of the often rapidly fulminant course of invasive bacterial infections in young infants. This practice is followed in industrialized countries where clinically ill-appearing newborns and young infants are treated with parenteral antibiotics on the basis of a diagnosis of “presumed sepsis,” although blood cultures eventually are found to yield no growth in the vast majority.8,16–18

In an effort to promote the early detection and appropriate referral of sick young infants by frontline health workers in resource-limited settings, WHO, United States Agency for International Development and the Saving Newborn Lives Initiative of Save the Children (funded by the Bill and Melinda Gates Foundation) sponsored a multicountry study to evaluate several clinical signs for their utility in making referral decisions compared with the judgment of an experienced clinician.19 Participating countries included Bangladesh, Bolivia, Ghana, India, Pakistan and South Africa. The Young Infant Clinical Signs Study resulted in the development of a simple clinical algorithm based on 7 signs and symptoms for predicting severe illness in the young infant with high sensitivity and moderate specificity for use in first-level health facilities.19 The 7 clinical signs and symptoms are history of difficulty feeding, history of convulsions, movement only when stimulated, respiratory rate of 60 breaths per minute or more, severe chest indrawing, temperature of 37.5°C or more or less than 35.5°C. The presence of any one triggers a decision to refer the infant. The availability of the validated Young Infant Clinical Signs of Severe Illness algorithm presented an evidence-based starting point for the development of a clinical definition of severe infection in the young infant for use in the proposed trials. However, certain limitations of this algorithm influence specificity for the diagnosis of infection, considerations that are important in equivalence trial settings where a nonspecific definition of infection could dilute out important differences in therapeutic options among a smaller group of infants who truly had severe bacterial infections included within a larger group of mildly ill infants who would recover without antibiotic therapy. In order to increase specificity of diagnosis of clinically diagnosed severe infection, the following modifications have been made: the fast respiratory rate sign has been dropped from our case definition as accumulating evidence indicates that it substantively reduces specificity of the case definition (see discussion below), the upper temperature cutoff (for fever) has been increased to 38°C (instead of 37.5°C) and history of difficulty feeding requires confirmation by observation of infant feeding (African sites) or determination of poor suck through digital examination if feeding cannot be observed (Asian sites). Presence of convulsions is considered to indicate critical illness, and infants with convulsions are excluded. Table 1 presents the case definition used for diagnosis of clinical severe infections in these trials.

Fast breathing (respiratory rate >60 per minutes) is frequently present as an isolated sign in young infants who do not otherwise appear ill.19 Fast breathing did not predict mortality in young infants in studies from Bangladesh and India.20–22 However, fast breathing even as a single sign is part of the WHO Integrated Management of Childhood Illness clinical algorithm and indicates very severe disease and need for hospital referral and parenteral antibiotics.23 This has created a management dilemma, whether to treat young infants with fast breathing alone as a mild illness or as a severe illness. In some settings from South Asia, neonates and young infants with fast breathing have been successfully treated by oral antibiotics.6,24,25 There are no studies from Africa, and none have compared oral antibiotics with injectable therapy for management of infants with fast breathing as the only sign of illness. Thus, there is a need to inform policy by providing evidence whether young infants with fast breathing alone can be treated with oral antibiotics. Such a study is being undertaken in the multicenter African sites.


Ideally, the selection of an appropriate antimicrobial agent is based on its ability to kill bacteria that are responsible for the infection in the majority of cases, based on efficacy and safety data, and pharmacokinetic information from relevant pediatric age groups.26 For the simplified antibiotic therapy trials, additional considerations include ease of delivery in community settings and cost—both factors with significant implications for future scale-up. The experimental arms, therefore, comprise combinations of injectable and oral antibiotics or switch therapy from injectable to oral antibiotics (Tables 2 and 3).

Penicillin and gentamicin are used globally for treating sepsis and presumed sepsis in the neonatal age group and the second month of life.15,27,28 Extended-interval (24-hourly) gentamicin regimens using doses ranging from 4 to 5 mg/kg/day have been shown to be as effective as traditional dosing regimens for treating neonatal sepsis.29–31 The combination of penicillin/amoxicillin and gentamicin targets common neonatal pathogens such as Escherichia coli, other enteric gram-negative rods, streptococci and pneumococci.

Benzyl penicillin and ampicillin need to be given 4 times a day, which is impractical in the outpatient setting. Based on recommendations from the 2007 London consultation on community-based strategies for management of severe infections in young infants born in high mortality settings,12 the pharmacologic profile of antibiotics32,33 and experience of their use,3–5 we decided to use a combination of procaine penicillin and gentamicin delivered by intramuscular (IM) injection as the reference arm to treat clinically diagnosed severe infection because both can be given in once daily dosing and together can successfully treat vast majority of bacterial infections in young infants.

For the simplified experimental regimens, amoxicillin was selected as the oral agent. Oral antibiotics have successfully been used in community-based management of neonatal pneumonia, resulting in significant reduction in pneumonia and overall neonatal mortality.6,24 There is extensive experience with use of oral amoxicillin in newborns and young infants, and safety of this drug is well-established in this age group.27,34 In full-term neonates, the bioavailability of oral amoxicillin is high at approximately 80%.35 Similar serum amoxicillin concentrations were achieved in neonates in the first 4 days of life with intravenous and oral routes, with the exception of the first 30 minutes after dosing when levels were lower with oral administration.36,37

All the simplified experimental arms in these studies employ oral amoxicillin, yet in varying ways (Table 2). Arm D (injection gentamicin for 2 days and oral amoxicillin for 7 days) is being undertaken only in the African sites because of reservations by the Technical Advisory Group about achieving an adequate sample size in Pakistan and Bangladesh within the funding period. The study comparing reference therapy with oral amoxicillin alone in infants who have only fast breathing is also being conducted in African young infants.

Amoxicillin has been recommended for use in doses ranging from 50 to 150 mg/kg/day. Higher doses are recommended to achieve minimum inhibitory concentrations that can overcome pneumococcal resistance. High-dose oral amoxicillin (80–90 mg/kg/day) is the therapy of choice for young children with otitis media and pneumonia due to suspected drug-resistant pneumococcal infection.38–40 The recommended intravenous dose of amoxicillin for neonates in the first week of life is 100 mg/kg divided every 12 hours, whereas 150 mg/kg/day divided every 8 hours is recommended for older neonates.27 In the African and South Asian trials, amoxicillin is given in doses ranging from 80 to 100 mg/kg/day based on 1 of 6 weight bands in which the infant falls.

The duration of antibiotic therapy is based on achievement of cure for an infection. The WHO recommendation of 10 or more days duration of therapy for antibiotic treatment is not based on strong evidence. Studies in Bangladesh and India have used 10 days of antibiotic therapy,4,5 whereas in Pakistan, 7 days of procaine penicillin and gentamicin once daily was found to be effective in the management of possible serious bacterial infection in young infants when families refused referral care.3 Very severe pneumonia in older children has been treated with 7 days of injectable antibiotics with good results,41 whereas severe pneumonia has been treated with 5 days of oral antibiotics.42 Switch therapy of injectable to oral antibiotics has been demonstrated to be efficacious for treatment of serious infections in neonates18 and in older children.43 For young infants with clinical severe infection included in this study, IM procaine penicillin will be used in a dose of 50,000 units/kg once daily IM and IM gentamicin in a 4–7.5 mg/kg/day once daily dose IM (depending on weight band of the young infant). Duration of all regimens in this study will be 7 days.

The trials are designed to be open-label because of the difficulty in ethically justifying use of placebo injections in the population under study and because acceptability of simplified regimens with lower number of injections is an important secondary outcome for the trials.


The current standard of care for young infants with clinical signs suggestive of severe infection is hospitalization and parenteral antibiotic therapy for 10 or more days.23 As discussed elsewhere in this supplement44 and previously reported,4,45 this standard of care is rarely practiced in developing countries with high neonatal mortality rates. For ethical reasons, in the design of these trials, we felt compelled to only include sites where neonatal mortality rates and hospitalization refusal rates were known to be high,8–10 and those young infants whose families refused referral advice for hospitalization for their sick young infants. Documented refusal of hospital admission thus forms an important inclusion criterion for enrolment of study subjects. The Bangladesh and Pakistan investigators have reported their experience with family acceptance for hospitalization.22,45 Other site characteristics are reported in the site-specific articles in this supplement. The African trial sites in Democratic Republic of Congo, Kenya and Nigeria were chosen to be broadly representative of central, eastern and western sub-Saharan African countries with neonatal mortality rates exceeding 40 per 1000 live births and remote locations making access to hospital facilities difficult for many families.2

Despite the effect on study generalizability, we are excluding young infants with clinical signs of critical illness (unconscious, convulsions, apnea, unable to feed, unable to cry, cyanosed, bulging fontanelle, persistent vomiting), infants with weight less than 1500 g and infants with surgical comorbidities because we cannot ethically justify random allocation of such infants to therapeutic options with oral antibiotics.


Treatment failure on or before 7 days of therapy has been chosen as the primary study outcome in these trials and defined as a composite of death, clinical deterioration, serious adverse event, hospitalization or persistence of clinical signs beyond specified days. Death, although a hard outcome, has not by itself been selected as a primary outcome because we expect the number of deaths to be low (around 2%) based on prior experience3 as rescue therapy is going to be provided and it will be unethical to withhold such therapy. Therefore, using the comparatively rare outcome of death will inflate the sample size to unfeasible levels. Because of the subjective nature of clinical signs of deterioration, their definitions and determination have been standardized across sites and are described further in the site-specific articles.8–10


This article describes the scientific rationale for the study designs of 3 trials of simplified antibiotic therapy for the management of clinically diagnosed severe infections and a trial of management of fast breathing in newborns and young infants currently being conducted in Bangladesh, Pakistan, Democratic Republic of Congo, Kenya and Nigeria. Although designed as independent studies, extensive collaboration between study sponsors and among study investigators has resulted in harmonization of study protocols wherever possible, which will allow subsequent pooled analyses by providing sufficient power to address important policy questions regarding outcomes in subgroups such as newborns with early-onset sepsis, and infants with multiple clinical signs (indicating more severe illness) versus single signs. These trials will inform the development of policies and guidelines regarding community case management of newborns and young infants with clinically diagnosed severe infections as well as for infants with fast breathing alone.


Accepted for publication June 5, 2013.

The views and opinions expressed in this article are those of the author(s) and not necessarily the views and opinions of the United States Agency for International Development or World Health Organization.

This journal article was supported with funds provided by Save the Children’s Saving Newborn Lives Program through a grant from the Bill and Melinda Gates Foundation. Its contents are solely the responsibility of the authors and do not necessarily reflect the views of Save the Children or the Bill and Melinda Gates Foundation.

The Pakistan study was funded by the Saving Newborn Lives program of Save the Children Federation, Inc, through a grant from the Bill and Melinda Gates Foundation and the World Health Organization. S.S.T. received training support from the Fogarty International Center, National Institute of Health, grant D43TW007585.

The Bangladesh study was funded by the United States Agency for International Development, through a cooperative agreement (GHS-A-00-09-00004-00) with the Johns Hopkins Bloomberg School of Public Health, World Health Organization and by the Saving Newborn Lives program of Save the Children Federation, Inc, through a grant from the Bill and Melinda Gates Foundation. The authors have no other funding or conflicts of interest to disclose.

The African study was funded by the World Health Organization through a grant from the Bill and Melinda Gates Foundation.

c1Address for correspondence: Anita K. M. Zaidi, MB BS, SM, Professor and Chair, Department of Paediatrics and Child Health, Aga Khan University, Stadium Road, PO Box 3500, Karachi, Pakistan. E-mail:

Copyright © 2013 by Maharaj Kishan Bhan. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License, where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially.

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[TableWrap ID: T1] TABLE 1. 

Comparison of WHO Integrated Management of Neonatal Child Illness Algorithm and Case Definition of Clinically Diagnosed Infection Used in the Young Infant Simplified Antibiotic Therapy Trials

[TableWrap ID: T2] TABLE 2. 

Antibiotics Regimens Evaluated in Trials of Simplified Antibiotic Therapy for Management of Newborns and Young Infants With Clinically Diagnosed Severe Infections (CSIs) or Fast Breathing

[TableWrap ID: T3] TABLE 3. 

Number of of Intramuscular (IM) Injections in Each Therapeutic Arm

Article Categories:
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Keywords: newborn, young infant, sepsis, pneumonia, meningitis, clinically severe infections, fast breathing, community management, community case management, antibiotic, gentamicin, amoxicillin, procaine penicillin, South Asia, sub-Saharan Africa.

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