Table of Contents    
Year : 2014  |  Volume : 5  |  Issue : 1  |  Page : 15-20  

Acute respiratory infections among under-5 children in India: A situational analysis

1 Department of Preventive and Social Medicine, Jawaharlal Institute of Post Graduate Medical Education and Research, Puducherry, India
2 Dept of Community medicine, Indira Gandhi Medical College and Research Institute, Puducherry, Puducherry, India

Date of Web Publication18-Feb-2014

Correspondence Address:
Kalaiselvi Selvaraj
Department of Preventive and Social Medicine, Jawaharlal Institute of Post Graduate Medical Education and Research, Puducherry 605 009
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0976-9668.127275

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Acute respiratory infections (ARIs) are the leading cause of death among children less than 5 years in India. Emergence of newer pathogenic organisms, reemergence of disease previously controlled, wide spread antibiotic resistance, and suboptimal immunization coverage even after many innovative efforts are major factors responsible for high incidence of ARI. Drastic reduction in the burden of ARI by low-cost interventions such as hand washing, breast feeding, availability of rapid and feasible array of diagnostics, and introduction of pentavalent vaccine under National Immunization Schedule which are ongoing are necessary for reduction of ARI.

Keywords: Acute respiratory infections, control of acute respiratory infection, disease burden, National Immunization Schedule, pneumonia, under-5 children, vaccine status

How to cite this article:
Selvaraj K, Chinnakali P, Majumdar A, Krishnan IS. Acute respiratory infections among under-5 children in India: A situational analysis. J Nat Sc Biol Med 2014;5:15-20

How to cite this URL:
Selvaraj K, Chinnakali P, Majumdar A, Krishnan IS. Acute respiratory infections among under-5 children in India: A situational analysis. J Nat Sc Biol Med [serial online] 2014 [cited 2021 Apr 12];5:15-20. Available from:

   Introduction Top

Acute respiratory infections (ARIs) contribute to major disease associated mortality and morbidity among children under 5 years. The existing evidences on ARI are focused on the burden of illness around urban slums and hence lack representative and reliable data resulting in under estimation of ARI prevalence. Shift in the infectious disease etiology from gram positive to gram negative organisms is not well-recognized by health care providers who often under utilize novel rapid diagnostic methods and/or irrationally use antibiotics leading to increased burden of ARI. Although a few studies have claimed efficacy and impact of vaccines (Hemophilus influenza (Hib), pneumococcal vaccines) in reducing the respiratory infections, [1],[2],[3],[4] ignorance and other competing priorities are major hurdles against implementing the newer vaccines in control of ARI. Within these circumstances, this review is focused toward the sensitization on disease burden, etiology, and state of newer vaccines against ARI in India.

   Methods Top

We searched PubMed, Google Scholar and official web sites of WHO, UNICEF, and MOHFW between 01/01/2013 and 28/02/2013. Articles were restricted to last 15 years pertaining to Indian context. Key words used for search are acute respiratory tract infections, pneumonia, upper respiratory infections, lower respiratory infections, influenza like illnesses, risk factors, and preventive interventions for respiratory illnesses, vaccine efficacy, and zinc prophylaxis. This review is organized in the sequence of current mortality burden, incidence of disease burden from Indian studies, risk factors, and preventive measures.


ARIs are the major cause of mortality among children aged less than 5 years especially in developing countries. Worldwide, 20% mortality among children aged less than 5 years is attributed to respiratory tract infections (predominantly pneumonia associated). If we include the neonatal pneumonia also in the pool, the burden comes around to be 35-40% mortality among children aged less than 5 years accounting for 2.04 million deaths/year. Southeast Asia stands first in number for ARI incidence, [5] accounting for more than 80% of all incidences together with sub-Saharan African countries. [6] In India, more than 4 lakh deaths every year are due to pneumonia accounting for 13%-16% of all deaths in the pediatric hospital admissions. [7],[8] Million deaths study based on the register general of India mortality statistics had reported 369,000 deaths due to pneumonia among children 1-59 months at the rate of 13.5/1000 live births. More number of deaths due to pneumonia was reported from central India. [9]


Estimating the morbidity burden has inherent challenges due to lack of uniformity in study definitions, spectral nature of illness and misclassification errors. Recent estimates suggest 3.5% of the global burden of disease is caused by ARI. [10] In developing countries, on an average every child has five episodes of ARI/year accounting for 30%-50% of the total pediatric outpatient visits and 20%-30% of the pediatric admissions. [10] Recent community-based estimates from prospective study report 70% of the childhood morbidities among children aged less than 5 years are due to ARI. [11] While in developing country, a child is likely to have around 0.3 episodes of pneumonia/year, in developed countries it is 0.03 episodes per child/year. [10] On this basis, India is predicted to have over 700 million episodes of ARI and over 52 million episodes of pneumonia every year. A study from Haryana by Broor et al., had reported 2387, 536, and 43 episodes of acute upper respiratory infections, acute lower respiratory infections, and severe acute lower respiratory infections respectively per 1000 child years. [Table 1] shows the burden of disease from various parts of India at different periods of time. [10],[12],[13],[14],[15],[16],[17],[18],[19]
Table 1: Incidence of acute respiratory infections in India

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It is important to note that ARI include spectrum of severity within it as a result majority of the milder infections may go undetected. Thus incidence of respiratory infections can be relied only from community-based longitudinal cohorts rather than hospital-based studies. Majority of studies regarding etiology of ARI were conducted 2 decades back and studies on etiology at present are lacking. Without representative community-based studies on etiology of ARI, it is difficult to recognize the intensity of this problem. Although some hospital-based studies have shown the emergence of different set of pathogen contributing to significant burden of ARI. [20],[21] Also, the reemergence of already controlled diseases such as pertussis has necessitated revision in National Immunization Schedule. Even some of the developed countries have suggest booster dose of acellular pertussis at the age of 10-12 years. Recent evidences from Delhi shows Chlamydia,  Escherichia More Details coli, and Mycoplasma cause more than 10% of pneumonia individually, where the past evidences describes them as rare pathogens. [20],[21] In clinical practice, this shift in etiology from gram positive to gram negative organisms needs to be considered. Scientific advances in laboratory diagnostic methods like antigen assays, rapid diagnostic kits, and noninvasive procedures like urinary antigen detection test have demonstrated successful identification of respiratory pathogens. [22] In some of the developed countries, the availability of multiplex real time Polymerase chain reaction assays have made diagnosis and etiology identification of ARI efficient. All these advancements are farther from reach of primary health care and even clinical diagnosis of pneumonia and empirical management based on Integrated Management of Neonatal and Childhood Illness (IMNCI) could save more lives.

Risk factors and determinants of ARI

Several small scale community-based studies have reported poor socioeconomic factors; low level of literacy, suboptimal breast feeding, malnutrition, unsatisfactory level of immunization coverage, cooking fuel used other than liquefied petroleum gas as risk factors contributing to increasing burden of ARI among children. [14],[23],[24]

Prevention and control of respiratory infections

Breast feeding

In developing countries, children who are exclusive breast fed for 6 months had 30%-42% lower incidence of ARI compared to children who did not received for same duration of breast feeding. [25] A recent research report from longitudinal cohort by Mihrshahi et al., [26] reported the increased risk of ARI (relative risk = 2.3) among children not breast fed adequately. Breast feeding is included under one of the life-saving tool in prevention of various childhood diseases. [27] Hence, breast feeding is among the WHO/UNICEF global action plan to stop pneumonia. In addition, hand washing, improved nutrition, and reduction of indoor air pollution are suggested as primary strategies to protect from pneumonia among children under 5 years age. [5]

Hand washing and respiratory infections

Quantitative systematic review of studies from developed countries estimated hand washing reduces the incidence of respiratory infections by 24% (ranging from 6% to 44%). [28] Evidences from developing countries are lacking on this issue.

Indoor air pollution from solid bio mass fuel

Exposure to indoor air pollution has 2.3 (1.9-2.7) times increased risk of respiratory infections (especially lower respiratory tract infections). [25] Hence, use of cleaner fuels or improvised stoves have proven to be the cost-effective interventions to reduce incidence of indoor air pollution. [29] Million deaths study has also reported increasing prevalence ratio (PR = 1.54 among males, 1.94 among females) of respiratory infections due to use of solid fuel. [30]

Vaccines in preventing respiratory tract infections

Severity and transmissibility of respiratory tract infections by major pathogens, limited availability of laboratory diagnostics, and antibiotic resistance to wide range of drugs makes vaccines as a potential intervention against ARI. While conventional fatality due to pertussis, diphtheria, and measles is reduced by routine immunization, infections due to other bacterial organisms such as H. influenza, Streptococcus pneumonia remains responsible for major burden of the disease. Despite the proven efficacy of vaccines and assistance through Global Alliance for Vaccines and Immunization (GAVI), wide scale implementation is lacking due to non availability of community-based studies to establish the evidence of ARI/pneumonia due to above organisms.

Vaccines against pertussis

Reemergence of increasing number of pertussis cases are evident. This has led to the change in National Immunization Schedule to introduce Diphtheria, Pertussiss and Tetanus, (DPT-booster) at 5 years of age instead of Diphtheria and Tetanus DT and raising the upper age limit for DPT vaccine to 7 years of age. [31]


The recent multiyear strategic plan of India gives an opportunity for Indian children to receive the second dose of measles vaccine. According to this plan, Measles, Mumps and Rubella (MMR) at 15-18 months of age is suggested in states with >80% immunization coverage, while catch up campaigns are suggested in states where less than 80% routine coverage is reported. [31]

Influenza vaccine among children

For children 6-23 months, two doses of trivalent influenza vaccine is recommended if country can afford, make it feasible, and cost-effective analysis is made in favor of vaccination. Children less than 6 months are exempted from vaccination, but protection of mother during pregnancy is recommended as a means to protect these young infants. However, for developing countries appropriate target groups for influenza vaccination is not well-defined. [32]

Vaccines against H. influenza-immediate candidate to be included in National Immunization Schedule

More than 95% H. influenza infections occur only among children. According to the recent estimates H. influenza contributes to annual burden of 8.13 million serious illnesses and 371,000 deaths worldwide. [33] From the first H. influenza vaccine trial conducted in 1973-74 showed the efficacy of vaccine against all types of invasive pathogens. [2],[34] Conjugated vaccines are shown to be more immunogenic and less reactogenic. [35] Various vaccine trials reported efficacy in the range of 98%-100% after three doses of vaccination, in contrast 35%-47% of the children had low level of immunoglobulin G antibodies against this organism when they did not receive any booster dose. [36] The estimated overall efficacy for three doses of Polyribosylribitol Phosphate-Tetanus Conjugate (Hib) Vaccine was 98.1% (95% confidence interval 97.3%-98.7%). [37] Efficacy in infants aged 5-11 months was 99.1%, 12-23 months 97.3%, and 24-35 months 94.7%. This vaccine not only protects against severe pneumonia but also prevents the colonization, thereby helping in prevention of disease transmission. [38] In spite of its safety, efficacy, feasibility to insert in routine immunization schedule and protection against huge number of avertable deaths most of the developing countries are hesitant to adopt this mode of intervention. Only impediment factor is cost and fear of reactions. Despite financial and technical assistance offered by GAVI introduction of this vaccine in National Immunization Schedule is slow due to questionable affordability toward long-term commitment. A recent study has shed some insight into vaccine safety wherein use of 1.25 μg dose of vaccine has given equivalent sero conversion with less reaction compared to conventional 5 μg doses. This dose reduction can further reduce cost of vaccination. [3]

Pneumococcal vaccines

Scope for inclusion under National Immunization Schedule: Pneumococcal infections alone contribute to 11% of all deaths among children under 5 years of age. [39] Randomized trial reports from nationwide Finish group of children had proven 100% efficacy of vaccine against vaccine serotypes when the 3 + 1 schedule (6, 10, 14 weeks infant series and 1 year post toddler) was adopted. [40] Vaccine efficacy against this 2 + 1 schedule was reported to be 92%. [41] Safety profiles were confirmed from many trials including the recent trial reported from 12 sites in India. [41],[42],[43] Like Hib vaccines, this also prevents colonization thereby facilitates the protection against the disease transmission. [44],[45] While the currently available PCV 7 gives protection against only seven serotypes, rest of the serotypes are left out. Unfortunately, vaccine which covers all 23 serotypes cannot be used among children under 2 years which is a most vulnerable period to get this disease. To widen the protection against additional serotypes PCV-13 is suggested. Trial reports from various countries again confirmed the safety profile and added protection by PCV13 compared to PCV 7. [42] However, issues on revaccination of children in 5 years age group remains a challenge. With these scientific evidences, political commitment toward acceptance for inclusion under routine vaccination is yet to be achieved.

MMR and chickenpox vaccine

Secondary pneumonia due to exanthematous illnesses like measles and chicken pox are next common cause for ARI among children. Despite their high incidence, prevention efforts with these vaccines are not under priority since other vaccines like H. influenza, Hep B are yet to be included in nationwide plan. Varicella and MMR can be given in two ways. Giving vaccines to adolescents and adults alone will protect the vulnerable group without changing the epidemiology of disease. Vaccination of children without focusing for high coverage level (coverage < 80%) will result in epidemiological shift leading to onset of cases (rubella and varicella) at adult age group which is more harmful than the existing scenario. For countries like India where second dose of measles is proposed recently (MMR at the age of 15-18 months) is recommended with emphasis on high coverage. Vaccine against varicella is not recommended at present under National Immunization Schedule considering the other priorities. Adults who are at risk of contacting varicella are advised to get vaccinated within 48 hrs of exposure. This prophylactic method has the proven efficacy of 90%. [46],[47]

Mile stones in control of ARI in India

On the basis of burden and effectiveness of simple primary health care interventions shown from the field, ARI control program was started in India during 1990. Since then, various community-based interventions are implemented under ARI control program. Identification of severe respiratory infections by health care worker from rural area, wide access to antibiotics, and its administration by health care workers, was seen as a successful model [Gadchiroli project, management of childhood illness by holistic approach of IMNCI]. Increasing coverage of vaccines against major vaccine-preventable diseases through various strategies under National Rural Health Mission, measles second dose implementation and newer introduction of pentavalent vaccines are the major primary health care measures currently implemented in India. [Table 2] shows the factors favoring introduction of these newer vaccines under National Immunization Schedule. Algorithm development and respiratory tract infection group education modules are the major steps taken by professional bodies toward management of ARI and irrational use of antibiotics.
Table 2: Vaccines against major respiratory pathogens

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Role of zinc in prevention of ARI

Controversial evidences are reported over the effect of zinc in prevention of ARI. While some of the evidences support its impact on reducing acute lower respiratory tract infections [48] other studies contradict this. [49],[50] Considering the tolerability and high threshold for toxic effects, the further recommendations on zinc in ARI will be based on the conclusions from ongoing community trials. However, global action plan to prevent pneumonia by WHO/UNICEF insists on routine zinc prophylaxis for children affected by acute diarrheal diseases.

For developing countries to take decision on various modes of interventions against ARI, cost-effective analysis is necessary. The assessment of various interventions against ARI has shown the high impact from interventions like breast feeding, zinc prophylaxis, access to clean fuel for cooking, and community/facility-based case management. These interventions are applicable even in resource poor settings to combat the burden of ARI drastically. [51]

   Conclusion Top

Incidence of respiratory infections cannot be reduced without an overall increase in social and economic development. But enormous evidences have shown various measures to reduce this disease mortality. Every reduction in death due to ARI would give an incremental benefit toward achieving the Millennium Development Goal (MDG 4). Final step toward control of ARI would be commitment to implement these proven and evidence-based interventions.

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8 Pediatric respiratory tract diseases: Chronological trends and perspectives
Houda Ben Ayed,Sourour Ya´ch,Ma´ssa Ben Jmaa,Jihene Jedidi,Mariem Ben Hmida,Maroua Trigui,Mondher Kassis,Raouf Karray,Yosra Mejdoub,Habib Feki,Jamel Damak
Pediatrics International. 2017;
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9 Household air pollution from cooking and risk of adverse health and birth outcomes in Bangladesh: a nationwide population-based study
Md Nuruzzaman Khan,Cherri Zhang B. Nurs,M. Mofizul Islam,Md Rafiqul Islam,Md Mizanur Rahman
Environmental Health. 2017; 16(1)
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10 Analysis of molecular genetic study on the polymorphic C-159T locus of the CD14 gene in children with increased risk of recurrent episodes of acute obstructive bronchitis
O. V. Kens,O. Z. Gnateyko,N. S. Lukyanenko,N. V. Vishtak,V. I. Bergtravm
Cytology and Genetics. 2017; 51(5): 365
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11 Seroprevalence of Mycoplasma pneumoniae Specific IgM and IgG Antibodies in Asymptomatic Preschool Aged Children of Tehran, Iran, 2010
Anahita Sanaei Dashti,Seyede Masumeh Hashemi,Mehrdad Halaji,Reza Arjmand,Fariba Shirvani
Archives of Pediatric Infectious Diseases. 2017; 5(4)
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12 Fine Particulate Matter in Urban Environments: A Trigger of Respiratory Symptoms in Sensitive Children
Daniel Dunea,Stefania Iordache,Alin Pohoata
International Journal of Environmental Research and Public Health. 2016; 13(12): 1246
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13 The current status of community-acquired pneumonia management and prevention in children under 5 years of age in India: a review
Krishna Kumar Yadav,Shally Awasthi
Therapeutic Advances in Infectious Disease. 2016; 3(3-4): 83
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14 Epidemiology of childhood diseases in an urban resettlement colony in Delhi
Udhayabashkaran Kadirvelu,Nandini Sharma,Madhankumar Velu,Charu Kohli
Clinical Epidemiology and Global Health. 2016;
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15 Epidemiology of acute respiratory infections in children - preliminary results of a cohort in a rural north Indian community
Anand Krishnan,Ritvik Amarchand,Vivek Gupta,Kathryn E. Lafond,Rizwan Abdulkader Suliankatchi,Siddhartha Saha,Sanjay Rai,Puneet Misra,Debjani Ram Purakayastha,Abhishek Wahi,Vishnubhatla Sreenivas,Arti Kapil,Fatimah Dawood,Chandrakant S. Pandav,Shobha Broor,Suresh K. Kapoor,Renu Lal,Marc-Alain Widdowson
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16 Research letters
Mohammed Abdel-Fattah,Bassant Meligy,Riham El-Sayed,Yosra A. El-Naga,Vidit Gupta,Pramod Sharma,Rakesh Jora,Minhas Amandeep,Anjani Kumar
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17 Solid Fuel in Kitchen and Acute Respiratory Tract Infection Among Under Five Children: Evidence from Nepal Demographic and Health Survey 2011
Pawan Acharya,Shiva Raj Mishra,Gabriele Berg-Beckhoff
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