Study team
EXECUTIVE SUMMARY
Background
Pneumonia is a leading cause of hospitalisation and death in children and adults in South Africa. HIV-infected
individuals of all age groups have a substantially elevated risk of hospitalisation and death due to pneumonia.
Outbreaks of novel respiratory pathogens such as pandemic influenza can have substantial public health implications.
For the above reasons, a sustainable, representative syndromic pneumonia surveillance programme is needed.
OBJECTIVES
Epidemiology
Estimate the burden of total and aetiology-specific pneumonia-related hospitalization and mortality in HIV-infected
and -uninfected children and adults.
Monitor trends in the relative contribution of important respiratory pathogens to the syndrome of pneumonia.
Describe the demographic and epidemiologic characteristics (including severity) of pneumonia cases presenting to
sentinel surveillance sites and describe how these vary by age group, HIV status, aetiology and temporally.
Determine the seasonality of influenza, respiratory syncytial virus (RSV) and other respiratory pathogens.
Determine the extent of specific co-infections and describe how these co-infections relate to patient morbidity and
outcome.
Compare the prevalence of Bordetella pertussis, Haemophilus influenzae, Streptococcus pneumoniae and influenza in
vaccinated and unvaccinated children and identify vaccine failures.
Assess the burden of disease associated with influenza as well as other respiratory pathogens among hospitalised
infants aged <1 year presenting with respiratory and non-respiratory acute medical illnesses for the 2 year
period from 2016-2017.
Describe the clinical diagnosis and management of respiratory pathogens among hospitalised infants.
Organism characterization
Characterize annual circulating influenza strains to guide vaccine strain selection for the Southern Hemisphere
influenza vaccine, identify drift from the annual vaccine and identify antiviral drug resistance.
Monitor changes in pneumococcal serotype distribution over time and the effect of the pneumococcal conjugate vaccine
on the proportion of vaccine and non-vaccine serotypes including serotype replacement.
Pandemic preparedness and outbreak response.
Identify and characterise novel respiratory pathogens in humans.
Identify and respond to respiratory disease outbreaks.
Methodology
Prospective hospital-based sentinel syndromic surveillance will be performed. Sites will be situated in:
KwaZulu-Natal Province (Edendale Hospital), Mpumalanga Province (Mapulaneng and Matikwana Hospitals), North-West
Province (Klerksdorp-Tshepong Hospital Complex), Gauteng Province (Rahima Moosa Mother and Child Hospital and Helen
Joseph Hospital) and the Western Cape (Red Cross Children’s Hospital and Mitchell’s Plain Hospital (MPH)).
Surveillance Officers (registered or enrolled nurses) will review the clinical details of patients admitted to
sentinel sites on weekdays to establish whether cases meet the surveillance case definitions. Identified cases will
be approached for inclusion. Consenting patients will be asked to complete a questionnaire by interview on previous
medical history and clinical data and to provide specimens. A naso/oropharyngeal specimen (oropharyngeal (OP) and
nasopharyngeal (NP) swab in all age groups and for a limited period an additional or nasopharyngeal aspirate (NPA)
in cases <5 years of age enrolled at KTHC and Edendale Hospital) will be collected for identification of
respiratory viruses and bacteria. Blood, urine (from adults) and sputum (from adults and from children at selected
sites) will be collected for testing for respiratory viruses and bacteria. NPAs and NP/OP swabs will be tested at
National Institute for Communicable Diseases (NICD) for the presence of influenza virus and other respiratory
viruses (including RSV, human metapneumovirus and parainfluenza) and bacteria (including H. influenzae S.
pneumoniae, Staphylococcus aureus, Bordetella species, Legionella species, Chlamydophila pneumoniae and Mycoplasma
pneumoniae) by viral/bacterial culture and polymerase chain reaction (PCR) as appropriate. Sputum will be tested for
Mycobacterium tuberculosis by culture as well as for other bacterial pathogens (including S. pneumoniae, Bordetella
species, Legionella species, C. pneumoniae, M. Pneumoniae, S. aureus and Moraxella catarrhalis) and Pneumocystis
jirovecii by PCR. Blood will be tested by PCR for bacteria including S. pneumoniae, H. influenzae, S. aureus, M.
catarrhalis, Klebsiella pneumoniae and Pseudomonas aeruginosa. In addition, at selected sites, among hospitalised
infants aged <1 year, additional blood that is collected at baseline (at enrolment) and an additional blood
specimen collected 3-5 weeks after admission will be tested for the presence of antibodies to influenza, RSV and
Bordetella pertussis in order to assess for acute infection. Urine will be tested for S. pneumoniae and Legionella
pneumophila. Results of routine patient investigations such as HIV testing, CD4 count, HIV viral load,
cytomegalovirus (CMV) testing and blood culture will be collected. If enrolled patients do not have a documented HIV
status and HIV-positive patients do not have a recent CD4 count, HIV and CD4 count will be tested according to the
national protocols. Data will be entered on a centralised database at NICD. Surveillance indicators will be reported
to stakeholders weekly in the influenza season and monthly out of season.
Background and literature review
Pneumonia in Children
Lower respiratory tract infections (LRTI) are the leading cause of morbidity and mortality amongst children aged
<5 years globally. In 2010, an estimated 1.4 million children died due to LRTI and an estimated 12 million were
hospitalised [1, 2]. LRTI is the most common cause of hospitalisation in HIV-infected children in sub-Saharan Africa
and HIV infection is associated with increased severity of LRTI and higher case fatality ratios [1, 3] . The
relative contribution of viral and bacterial aetiologies to the syndrome of pneumonia also varies by HIV status.
Data from the SARI surveillance system estimates the overall incidence of LRTI in South African children <5 years
of age to be 2530-3173/100,000 with the highest incidence in children aged <1 year (annual range
8446-10532/100,000). The risk of hospitalization with LRTI was up to three times higher in HIV-infected compared to
HIV-uninfected children [4].
Many pneumonia hospitalisations and deaths in children are preventable through public health interventions the most
notable of which is vaccination; with vaccines available against several of the major causes of childhood pneumonia
(pneumococcus, pertussis, Hib and influenza). The Hib conjugate vaccine was introduced into the South African
immunisation programme in 1999 and the pneumococcal conjugate vaccine (PCV) in April 2009[5]. Pertussis vaccination
for children was introduced in the South African vaccine schedule in 1995. Influenza vaccine is administered through
the public and private sectors in South Africa but <1 million doses are distributed each year through the public
sector. As bacterial aetiologies decline due to vaccination, respiratory viral causes of LRTI may gain greater
prominence.
Pneumonia in adults
Community-acquired pneumonia (CAP) and influenza are the second commonest cause of death in South African adults
aged 15-49 years accounting for 10% of all deaths in this age group in 2005[6]. The major causative pathogens of CAP
in South African adults include common bacterial causes (S. pneumoniae, S. aureus and H. influenzae) and atypical
bacterial causes (Mycoplasma pneumoniae, Chlamydophila pneumoniae, and Legionella spp.) [7, 8]. SARI data describes
the annual incidence of SARI hospitalisation in South African adults to be 388-619/100,000 and highest in
individuals aged 45-64 years (640-1285/100,000). HIV-infected adults have 13-19 times increased risk of
hospitalisation with SARI as compared to HIV-uninfected adults and were more likely to be co-infected with
pneumococcus, experience prolonged hospitalization and increased risk of death once hospitalised. The case-fatality
ratio was 1.5 times greater amongst HIV-infected (8%, 351/4610) as compared to HIV-uninfected (5%, 85/1653)
individuals [9]. HIV-infected patients are at increased risk of pneumonia due to bacterial pathogens such as S.
pneumoniae; in addition pathogens such as P. jirovecii and TB play a major role in adults infected with HIV [10,
11]. The role of atypical bacteria is not well described.
METHODS AND PROCEDURES
Objectives
Epidemiology
Estimate the burden of total and aetiology-specific pneumonia-related hospitalization and mortality associated with
pneumonia and by aetiology in HIV-infected and –uninfected children and adults.
Monitor trends in the relative contribution of important respiratory pathogens to the syndrome of pneumonia.
Describe the demographic and epidemiologic characteristics (including severity) of pneumonia cases presenting to
sentinel surveillance sites and describe how these vary by age group, HIV status, aetiology and temporally.
Determine the seasonality of the influenza and respiratory syncytial virus (RSV) and other respiratory pathogens
seasons annually.
Determine the extent of specific co-infections and describe how these co-infections relate to patient morbidity and
outcome.
Compare the prevalence of B. pertussis, H. influenzae, S. pneumoniae and influenza in vaccinated and unvaccinated
children and identify vaccine failures.
Assess the burden of disease associated with influenza as well as other respiratory pathogens among hospitalised
infants aged <1 year presenting with respiratory and non-respiratory acute medical illnesses for the 2 year
period from 2016-2017.
Describe the clinical diagnosis and management of respiratory pathogens among hospitalised infants.
Organism characterization
Characterize annual circulating influenza strains to guide vaccine strain selection for the Southern Hemisphere
influenza vaccine, identify drift from the annual vaccine and identify antiviral drug resistance.
Monitor changes in pneumococcal serotype distribution over time and the effect of the pneumococcal conjugate vaccine
on the proportion of vaccine and non-vaccine serotypes including serotype replacement.
Pandemic preparedness
Identify and characterise novel respiratory pathogens in humans
Identify and respond to respiratory disease outbreaks
Surveillance Programme Design
A prospective syndromic hospital-based sentinel surveillance programme will be introduced. Sites will be situated in
five of the nine provinces. The programme will be conducted at hospitals with existing surveillance programmes:
KwaZulu-Natal Province (Edendale Hospital), Mpumalunga Province (Mapulaneng and Matikwana Hospitals), North-West
Province (Klerksdorp-Tshepong Hospital Complex). Additional sites will be started in Gauteng (Rahima Moosa Mother
and Child Hospital (RMMCH) and Helen Joseph Hospital (HJH)) and Western Cape (Red Cross Children’s Hospital (RCCH)
and Mitchell’s Plain Hospital (MPH)) during 2015-2016 period. Surveillance officers (registered/enrolled nurses)
will review the clinical details of patients admitted to sentinel sites to establish whether cases meet the
surveillance case definition/s (Table1). Identified cases will be approached for inclusion in the sentinel
surveillance. Consenting patients will be asked to complete a questionnaire by interview on previous medical history
and clinical data and to provide specimens as described in table 2 below.
At RMMCH, surveillance for pertussis has been conducted by NICD investigators since 2013 (Protocol title: Sentinel
Surveillance for pertussis in South Africa, as an addition to the protocol ‘Essential Communicable Disease
Surveillance Activities of the National Institute for Communicable Diseases of Public Health Importance in South
Africa, M060449). Going forward, pertussis surveillance at RMMCH will be incorporated into the NICD pneumonia
surveillance programme described in this protocol. To ensure comparability of data at this site case definitions and
specimen collection procedures at RMMCH will be slightly modified as detailed below.
Study team
Principal Investigators: | |
Cheryl Cohen | Centre for Respiratory Diseases and Meningitis (CRDM), National Institute for Communicable Diseases(NICD) |
Shabir Madhi | Executive director, National Institute for Communicable Diseases (NICD) |
Heather Zar | Department of Child and Adolescent Health, Red Cross War Memorial Children’s Hospital |
Project Coordinator: | |
Washiefa Isaacs Tel: (021) 658-5515 |
Centre for Respiratory Diseases and Meningitis (CRDM) National Institute for Communicable Diseases (NICD) Research Centre for Adolescent and Child Health (REACH) |
Medical Officer: | |
Dr Liza Rossi Tel: (021) 658-5515 |
National Institute for Communicable Diseases (NICD) Centre for Respiratory Diseases and Meningitis (CRDM) Research Centre for Adolescent and Child Health (REACH) |