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SAMJ: South African Medical Journal

versión On-line ISSN 2078-5135
versión impresa ISSN 0256-9574

SAMJ, S. Afr. med. j. vol.109 no.5 Cape Town may. 2019

http://dx.doi.org/10.7196/samj.2019.v109i5.13789 

IN PRACTICE
CASE REPORT

 

Tuberculosis transmission in a hospitalised neonate: Need for optimised tuberculosis screening of pregnant and postpartum women

 

 

J ZenhäusernI; A BekkerII; M A WatesIII; H S SchaafIV; DramowskiV

IMB ChB; Department of Paediatrics, Karl Bremer Hospital, Cape Town, South Africa
IIMB ChB, MMed (Paed), Cert Neonatology (SA), PhD; Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, and Tygerberg Hospital, Cape Town, South Africa
IIIMB ChB, FCPaed; Department of Paediatrics, Karl Bremer Hospital, Cape Town, South Africa
IVMB ChB, MMed, PhD; Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, and Tygerberg Hospital, Cape Town, South Africa
VMB ChB, FCPaed, MMed (Paed), Cert Paed ID, PhD Academic Unit for Infection Prevention and Control, Division of Health Systems and Public Health, Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa

Correspondence

 

 


ABSTRACT

A recent fatal case of confirmed nosocomial tuberculosis (TB) transmission to a neonate in a kangaroo mother care (KMC) unit highlighted the infection risk to hospitalised neonates in South Africa, a high-burden TB setting. The index case was a 9-week-old infant who presented to another hospital's intensive care unit with severe respiratory distress shortly after discharge from the KMC unit. Contact tracing identified that the infant had been exposed to a postpartum woman with undiagnosed pulmonary TB while in the KMC unit. Molecular testing confirmed nosocomial transmission between the index case and the presumed source case in the KMC unit. We describe the subsequent process of tracing other TB-exposed infants and mothers, the difficulty in confirming TB infection/disease in pregnancy, and the provision of isoniazid preventive therapy in this cohort. We discuss the practical implementation of TB screening approaches in maternity and neonatal wards in high-burden TB settings.


 

 

South Africa (SA) is one of 22 high-burden tuberculosis (TB) countries and has among the highest TB incidence and HIV prevalence rates globally.[1] SA women in their child-bearing years are at high risk of dual TB and HIV infection, which may pose a significant threat to their newborns if one or both diseases remain undiagnosed and/or untreated. Studies have demonstrated that active screening for TB in antenatal and postnatal care settings is beneficial to both mothers and babies.[2] However, several local studies have demonstrated missed or delayed diagnosis of TB in pregnant SA women, with devastating consequences for them and their babies.[3,4]

Despite antenatal TB screening being recommended by the 2014 National Tuberculosis Management Guidelines,[5] routine implementation of screening in busy antenatal clinics is uncommon. Furthermore, no official guidelines exist for TB screening of mothers in kangaroo mother care (KMC) units during the postpartum period, a period that has been shown to carry an increased risk of TB disease.[6] Cases of TB exposure in hospitalised newborns and infants have been documented, particularly from KMC units in TB-endemic settings.[7-10] The risk of TB transmission in KMC units is of particular concern, as mothers and infants spend prolonged periods of time in small, often poorly ventilated rooms.[7] TB-exposed infants are at high risk of developing TB in the absence of appropriate preventive therapy, with up to 50% of infants developing TB, 30% of whom will have progressive pulmonary or disseminated disease, following exposure and infection.[11]

Undiagnosed TB in mothers poses a serious risk of transmission, not only to their own infants but also to other infants in neonatal and paediatric wards, their parents and healthcare workers.[12] There is a clear need to improve TB control strategies in TB-endemic regions, especially in the antenatal, postnatal, neonatal and paedia-tric healthcare settings.[13] In this case report we report nosocomial TB transmission to a neonate in a KMC unit, describe the outbreak investigation that ensued, and present recommendations for the prevention of TB transmission in maternity, neonatal and paediatric care settings in SA.

 

Case report

The index case

A 9-week-old male infant, born at 34 weeks' gestational age with a birth weight of 2 040 g, presented to Tygerberg Hospital with a short history of fast breathing, poor feeding and lethargy. He was one of a set of HIV-unexposed twins who had recently been discharged from Karl Bremer Hospital, a district hospital, following a 17-day stay in the KMC unit. At the time of re-hospitalisation the index case's twin was asymptomatic. The index infant was admitted for investigation and treatment of presumed bacterial sepsis and pneumonia. Intravenous antibiotic therapy (ampicillin and cefotaxime) was commenced. He was transferred to the paediatric intensive care unit for mechanical ventilation after respiratory deterioration. A chest radiograph showed diffuse bilateral pulmonary infiltrates (Fig. 1, A) on the first day of admission. The infant subsequently deteriorated further, requiring high-frequency oscillatory ventilation and nitric oxide therapy. A subsequent chest radiograph 5 days later still showed diffuse bilateral infiltration with a right upper lobe collapse (Fig. 1, B). Poor response to treatment prompted TB investigations; the diagnosis was confirmed on Xpert MTB/RIF testing of a tracheal aspirate (confirming rifampicin-susceptible Mycobacterium tuberculosis). Four-drug anti-TB therapy was commenced with isoniazid, rifampicin, ethambutol and pyrazinamide on day 5 of admission. Owing to further clinical deterioration and increasing ventilation requirements, ganciclovir, high-dose co-trimoxazole, meropenem and vancomycin were also initiated. However, the baby died of multiorgan failure 2 days after the diagnosis of TB. On questioning the family, there were no known household TB source cases. However, the baby's mother reported having shared a room in the KMC unit with another mother who had coughed constantly during her 2-week stay.

 


 

The source case

After obtaining a more detailed history from the mother of the deceased twin and reviewing the hospital records, the possible adult TB source case was identified as a 38-year-old HIV-negative postpartum woman. She had delivered a baby girl (31 weeks' gestational age, 1 140 g) at Tygerberg Hospital and was transferred to a step-down KMC unit at Karl Bremer Hospital 2 weeks later. At the KMC unit, the source case had slept in the bed adjacent to the index case, his twin and their mother for the full hospital stay. The source case's continuous, productive coughing had been noticed by other KMC unit mothers and allegedly reported to the hospital staff, but unfortunately no further action to investigate her symptoms had been taken. As part of the contact tracing investigation, the source case's medical and laboratory investigations were reviewed and it was discovered that she had recently had sputum samples for TB investigation submitted from a community TB clinic. Her two specimens were microscopy 3+ smear-positive for acid-fast bacilli and Xpert MTB/RIF-positive for rifampicin-susceptible M. tuberculosis. On contacting the community TB clinic, we learnt that the source case had been recalled to commence TB therapy. Tragically, her own premature infant had been declared dead on arrival at a local clinic the week before, after a short history of cough and respiratory distress (probably TB disease).

Investigation and contact tracing

Liquid TB culture samples from the index case and the presumed source case were retrieved from the National Health Laboratory Service at Tygerberg Hospital and Green Point TB laboratories, respectively, for comparison. Spoligotyping (a rapid, polymerase chain reaction-based method for genotyping strains of the M. tuberculosis complex that could be used to compare strains) was performed at the Stellenbosch University biomolecular laboratory and confirmed that the strains were identical, belonging to Spoligo International Type 119 (Xl-family), confirming nosocomial transmission in the KMC unit. To minimise further potential morbidity and mortality among patients, a contact tracing investigation of mothers, their infants and staff was commenced at the two hospitals where the source case and her premature infant had been hospitalised. Potential TB contacts were defined as infants, mothers and staff whose admission/ service period on the KMC unit coincided with that of the source case (regardless of whether they had shared a room with the source case). The risk of TB transmission was assessed as low at the referral hospital, as the source case had not been an inpatient there and all the infants in the ward to which her baby had been admitted were in incubators, but telephonic follow-up was conducted (30/46 infants were thriving and asymptomatic, 15/46 could not be traced and 1 infant had died from other causes).

Thirty-four mother-infant pairs were identified from the district hospital KMC unit patient register (in total 36 infants, as there were two sets of twins). Contact tracing was conducted using postal communication, telephone calls and home visits by the local police service. Of the 36 infants, 23 (64%) were recalled and 13 could not be traced despite repeated attempts. A standardised screening method was followed for the mothers (TB symptom screening plus a chest radiograph) and for TB-exposed babies (growth chart weight plotting to identify failure to thrive, symptom screening for cough, lethargy, poor feeding and a chest radiograph). Any radiographic or clinical findings in keeping with possible TB prompted collection of two gastric aspirates for Xpert testing and mycobacterial culture. Of the 23 infants screened, 10 (43%) required TB investigation with gastric aspirates; all 10 were acid-fast bacilli smear- and mycobacterial culture-negative. After excluding TB disease, 21/23 (91%) of the traced infants were commenced on a 6-month course of isoniazid preventive therapy (IPT). Only the index case and his sibling (2/23, 9%) had been/were commenced on treatment for TB disease. The twin of the index case was placed on a three-drug TB regimen for 6 months owing to symptoms that included cough, a suspicious chest radiograph and failure to thrive. The source case's baby had died prior to TB investigations, bringing the total number of TB-exposed infants who had confirmed/presumed TB disease to 3/36 (8%).

 

Discussion

This case report from an SA neonatal KMC unit demonstrates the vulnerability of neonates to nosocomial TB infection and highlights the need for prompt identification of TB in pregnant and postpartum women in TB-endemic countries. Despite several published reports of TB transmission to hospitalised neonates, most TB-endemic settings have yet to implement standardised TB screening that is integrated into existing antenatal, intrapartum, postpartum, neonatal and paediatric healthcare services.[7-10,14,15] TB is also the leading cause of non-obstetric-related maternal death.[16-18]

There are various reasons for the lack of maternal TB screening recommendations and implementation in low-resource, TB-endemic countries.

Most countries do not screen routinely for TB in pregnancy, or report the pregnancy status of female TB patients. In 2011, there were an estimated 216 500 cases of TB in pregnant women, with the highest burden in Africa (41% of cases globally).[17] Pregnant women are at increased risk of developing TB disease,[19] but may present nonspecifically and/or have overlap of TB symptoms (fatigue and malaise) with normal pregnancy-related complaints, making the clinical diagnosis of TB in pregnancy difficult.[16,17] As a result, pulmonary TB and extrapulmonary TB disease is often not appropriately investi-gated,[16,17,20] with a delay in TB diagnosis of 4 - 26 weeks on average.[16,21-23] Increased awareness of TB risk and clinical presentation in pregnant and postpartum women is needed for both healthcare staff and patients, especially in countries with a high TB burden.

Additional challenges to the prompt diagnosis of TB in pregnant women include poor access to high-quality maternity services, lack of integrated TB screening in maternity services, presentation for antenatal care late in pregnancy, and TB-related stigma.[24-26] Furthermore, the evidence base to inform best practices for maternal TB screening is limited. Most TB programmes use the World Health Organization-recommended TB four-symptom screen to identify the presence of any cough, fever, night sweats or weight loss.[27-29] The presence of any symptom prompts further investigation with TB sputum smear microscopy/Xpert test and chest radiography when indicated. However, the sensitivity of clinical screening for TB in pregnant women can be as low as 28%, particularly among HIV-infected women.[30] Chest radiography in addition to clinical symptom screening may be a more effective way to identify TB in pregnancy, particularly in settings with a high TB/HIV burden.[12,15,28,2931l

In many cases, discovery of an episode of inadvertent TB exposure in a hospital setting occurs only after recognition of the disease in an index case (often occurring long after the TB exposure event). There are several challenges in deciding on the approach for the exposure/outbreak investigations, including establishing the identity, location and TB treatment status of the source case/s; the infectivity, exposure time and TB drug resistance pattern of the source case/s; the number of exposed infants, staff and parents; the best method to trace and recall affected patients; the best method of screening for TB disease; and whether to provide IPT. For infants with TB disease and no known household TB source case, nosocomial TB exposure during hospitalisation episodes is a strong possibility. A major challenge in our management of this TB-exposure incident was the tracing of babies from the two KMC units, as phone numbers and addresses were incorrect in many hospital folders, and many patients had relocated to other provinces following the birth of their baby. Among babies who were successfully traced, underwent TB screening and received IPT, there were no further readmissions and the prophylaxis was well tolerated. Both hospitals' KMC units sensitised staff to screen for TB in postpartum women being admitted on the neonatal wards, and a TB screening protocol was implemented at the district hospital (Fig. 2).

 

 

Inadvertent TB exposure in neonatal/KMC wards in SA is likely to occur frequently given our high TB incidence and HIV prevalence rates among pregnant women. In order to reduce the risk of TB transmission to hospitalised infants, SA should encourage routine TB screening in antenatal care settings and implement postpartum TB screening in neonatal wards before women are moved to KMC units (Table 1).

 

Conclusions

Hospitalised infants and healthcare staff in TB-endemic settings are at high risk of TB exposure in healthcare facilities where maternal TB screening is not routinely conducted. Active TB screening and case-finding programmes for pregnant women are an important way to improve maternal/infant health and survival in TB-endemic settings. Standardised recommendations for TB/HIV screening of pregnant and postpartum women should be developed to ensure prompt identification of infectious individuals and prevent TB transmission in SA healthcare facilities.

Declaration. None.

Acknowledgements. The authors thank the parents of the index case, who consented to publication of this case report, the clinicians who cared for the index baby in the paediatric intensive care unit (Dr Noor Parker and Prof. Pierre Goussard), the National Health Laboratory Service for obtaining the specimens (Dr Adre Lourens and Cornelia Rautenbach), the Stellenbosch University TB laboratory for performing the spoligotyping (Dr Lizma Streicher and Prof. Rob Warren), the staff of the neonatal units (Sr Fila Abrahams) and infection prevention services at Karl Bremer and Tygerberg hospitals (Sr Anri van Rooyen and Sr Marina Aucamp) who assisted with the contact tracing investigation, and Sr Rula at the local TB clinic. A special thanks also to Dr Liezl Smit, who designed the first version of the TB screening tool.

Author contributions. JZ, AD and AB drafted the first version of the manuscript. JZ and MW conducted the contact investigation at the district hospital KMC unit. AB, HSS and AD supervised the contact tracing at the referral hospital. All authors gave input on and approved the final version of the manuscript.

Funding. None.

Conflicts of interest. None.

 

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Correspondence:
J Zenhäusern
janinezen@gmail.com

Accepted 21 February 2019

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