Epidemiology of tuberculosis among children in the United States: 1985 to 1994

A case report of a child with probable drug resistant tuberculous pericarditis with a review of challenges involved in diagnosis, treatment and follow up of children with DR-TB pericarditis

Background

There are unique challenges in the diagnosis and management of multi drug resistant tuberculosis (MDR-TB) in children. It is difficult to obtain confirmatory microbiological diagnosis in TB pericarditis. It is essential to differentiate between drug sensitive and drug resistant forms of TB as it has a major bearing on the regimen used, and inappropriate TB treatment combined with steroid use for pericarditis can lead to deterioration. With lack of samples, the treatment decision relies on the drug resistance pattern of the close contact if available. Therapeutic challenges of MDR-TB management in a child involve use of toxic drugs that need to be judiciously handled. We report a 2 years 4 months old male child who was diagnosed with TB pericarditis and treated based on the resistance pattern of his mother who was on treatment for pulmonary MDR-TB.

Case presentation

This 2 years 4 months old male child was diagnosed with TB involving his pericardium. Getting him started on an appropriate regimen was delayed due to the difficulty in establishing microbiological confirmation and drug susceptibility. He was commenced on a regimen based on his mother’s drug resistance pattern and required surgery due to cardiac failure during the course of his treatment. He successfully completed 2 years of therapy.

Conclusions

This child’s case demonstrates that despite unique challenges in diagnosis and management of drug resistant extra pulmonary tuberculosis in children, treatment of even complex forms can be successful. The need for high suspicion of MDR-TB, especially when there is close contact with pulmonary TB, careful design of an effective regimen that is tolerated by the child, indications for invasive surgical management of pericarditis, appropriate follow-up and management of adverse effects are emphasised.

Tuberculous lymphadenitis of the head and neck in Canadian children: Experience from a low-burden region

BACKGROUND

Children are more likely than adults to develop extra-pulmonary tuberculosis (EPTB), which often presents as cervical lymphadenopathy. The role of surgery in management is uncertain. We reviewed all head and neck EPTB cases presenting to our tertiary care pediatric institution over a twelve-year period.

METHODS

All children 18 years of age and younger with EPTB involving the head and neck were included. We recorded clinical data and age at diagnosis, birth country, BCG vaccination status, as well as radiographic, surgical, histological, and microbiological results.

RESULTS

All 16 patients presented with cervical lymphadenopathy. Fourteen were born outside of Canada in TB endemic areas and all had foreign-born parents. Diagnosis was confirmed microbiologically from lymph node biopsies in 14 cases. Multi-drug resistant TB was identified in two cases: both had previous excisional node biopsies that had not been cultured. Two patients had culture negative suppuration despite adequate anti-tuberculous treatment that required surgery for cure.

CONCLUSION

Ongoing suppuration despite appropriate drug therapy is seen in a minority of patients. We found that excisional lymph node biopsy of diseased cervical lymph nodes is diagnostic, and also therapeutic in some cases with ongoing suppuration despite appropriate drug therapy. Mycobacterial culture of lymph nodes is important for diagnosis and determination of drug resistance patterns.

Commentary: a targets framework: dismantling the invisibility trap for children with drug-resistant tuberculosis

Tuberculosis (TB) is an airborne infectious disease that is both preventable and curable, yet it kills more than a million people every year. Children are highly vulnerable, but often invisible casualties. Drug-resistant forms of TB are on the rise globally, and children are as vulnerable as adults but less likely to be counted as cases of drug-resistant disease if they become sick. Four factors make children with drug-resistant TB 'invisible': first, the nature of the disease in children; second, deficiencies in existing diagnostic tools; third, overreliance on these tools; and fourth, our collective failure to deploy one effective tool for finding and treating children - contact investigation. We describe a nascent science-advocacy network - the Sentinel Project on Pediatric Drug-Resistant Tuberculosis - whose goal is to end child deaths from this disease. Provisional annual targets, focused on children exposed at home to multidrug-resistant TB, to be updated every year, constitute a framework to focus attention and collective actions at the community, national, and global levels. The targets in two age groups, under 5 and 5-14 years old, tell us the number of: (i) children who require complete evaluation for TB disease and infection; (ii) children who require treatment for TB disease; and (iii) children who would benefit from preventive therapy.

Tuberculosis epidemiology and selection in an autochthonous Siberian population from the 16th-19th century

Tuberculosis is one of most ancient diseases affecting human populations. Although numerous studies have tried to detect pathogenic DNA in ancient skeletons, the successful identification of ancient tuberculosis strains remains rare. Here, we describe a study of 140 ancient subjects inhumed in Yakutia (Eastern Siberia) during a tuberculosis outbreak, dating from the 16(th)-19(th) century. For a long time, Yakut populations had remained isolated from European populations, and it was not until the beginning of the 17(th) century that first contacts were made with European settlers. Subsequently, tuberculosis spread throughout Yakutia, and the evolution of tuberculosis frequencies can be tracked until the 19(th) century. This study took a multidisciplinary approach, examining historical and paleo-epidemiological data to understand the impact of tuberculosis on ancient Yakut population. In addition, molecular identification of the ancient tuberculosis strain was realized to elucidate the natural history and host-pathogen co-evolution of human tuberculosis that was present in this population. This was achieved by the molecular detection of the IS6110 sequence and SNP genotyping by the SNaPshot technique. Results demonstrated that the strain belongs to cluster PGG2-SCG-5, evocating a European origin. Our study suggests that the Yakut population may have been shaped by selection pressures, exerted by several illnesses, including tuberculosis, over several centuries. This confirms the validity and necessity of using a multidisciplinary approach to understand the natural history of Mycobacterium tuberculosis infection and disease.

Risk factors for in-hospital mortality among children with tuberculosis: the 25-year experience in Peru

OBJECTIVE

We examined factors associated with in-hospital death among children with tuberculosis (TB). We hypothesized that a negative response to tuberculin skin testing (TST) would predict decreased survival.

METHODS

This retrospective cohort comprised 2392 children ages 0 to 14 years hospitalized with TB at a Peruvian referral hospital over the 25-year study period. Detailed chart abstraction captured clinical history including TB contacts, physical examination findings, diagnostic data, treatment regimen, and hospitalization outcome. We used Cox proportional hazards regression analyses to determine risk factors for mortality.

RESULTS

Of 2392 children, 2 (0.1%) were known to be HIV-positive, 5 (0.2%) had documented multidrug-resistant TB, and 266 (11%) died. The median time from hospitalization to death was 16 days (interquartile range: 4-44 days). Reaction of <5 mm induration on TST predicted death in a multivariable analysis (hazard ratio [HR]: 3.01; 95% confidence interval [CI]: 2.15-4.21; P < .0001). Younger age, period of admission, alteration of mental status (HR: 3.25; 95% CI: 2.48-4.27; P < .0001), respiratory distress (HR: 1.40; 95% CI: 1.07-1.83; P = .01), peripheral edema (HR: 1.97; 95% CI: 1.42-2.73; P < .0001), and hemoptysis (HR: 0.57; 95% CI: 0.32-1.00; P = .05) were associated with mortality. Treatment regimens that contained rifampicin (HR: 0.47; 95% CI: 0.33-0.68; P < .0001) were associated with improved survival.

CONCLUSIONS

Negative reaction to TST is highly predictive of death among children with active TB. In children with clinical and radiographic findings suggestive of TB, a negative TST should not preclude or delay anti-TB therapy.

Tuberculosis in childhood

There has been a recent global resurgence of tuberculosis (TB) fuelled by HIV infection and migration. Childhood TB represents a sentinel event in the community, suggesting recent transmission from an infectious adult. The diagnosis of TB in children is based on chest X-ray, tuberculin skin testing and mycobacterial staining/culture, although the diagnostic yield from these investigations is often lower than in adults. Newer diagnostic tests are being developed and may improve the diagnostic yield in childhood TB. Treatment of TB in children is similar to adults in that short-course multidrug treatment has been adopted as standard therapy in many national TB programmes. Compliance is a major determinant of the success of drug treatment and directly observed therapy has been adopted as a key component of TB treatment programmes. Although uncommon in children, multidrug-resistant TB is also increasing and treatment often involves longer courses of therapy with second-line drugs.

Toxoplasma, toxocara and tuberculosis co-infection in a four year old child

BACKGROUND

Tuberculosis. toxocariasis and toxoplasmosis are among the common infectious causes of lymphadenitis in children. Cases of Toxoplasma gondii and Toxocara spp co-infection have been reported.

CASE PRESENTATION

This case report describes a co-infection of Toxoplasma gondii, Toxocara spp and tuberculosis in a child with chronic lymphadenopathy and eosinophilia.

CONCLUSION

The case report highlights two important points. First is the diagnostic challenges that are encountered by clinicians in tropical countries such as Sri Lanka, where lymphadenopathy and eosinophilia with a positive serology commonly point towards a parasitic infection. Secondly the importance of proper history taking and performing the Mantoux test as a first line investigation in a country where the incidence of tuberculosis is low, even in the absence of a positive contact history.

Pediatric tuberculosis in Alberta: epidemiology and case characteristics (1990-2004)

BACKGROUND

Pediatric tuberculosis (TB) is important medically and indicative of a public health problem. An understanding of the epidemiology and case characteristics of pediatric TB, in a province that accepts large numbers of immigrants, can inform TB elimination strategy.

METHODS

All cases of pediatric TB notified in Alberta between 1990 and 2004 were identified in the TB Registry. Individual diagnostic criteria were reviewed and case patients were related to a population grid derived from Statistics Canada censuses and population estimates of Status Indians from the Department of Indian and Northern Affairs, Canada. Incidence rates were determined by ethnic group and gender. Clinical/mycobacteriologic case characteristics were compared by ethnic group and birth country.

RESULTS

Among 124 notified cases, 95 (96 episodes) met strict diagnostic criteria: 45 Status Indians, 30 Canadian-born 'other' and 21 foreign-born. Incidence rates were much higher in Status Indians and the foreign-born compared to the Canadian-born 'other'; 10.7, 5.4, and 0.4 per 100,000 person-years, respectively. Among Canadian-born 'other' cases, 12 were Métis and 11 were Canadian-born children of foreign-born parents. Compared to foreign-born cases, Canadian-born cases were more likely to have a source case in Alberta, to be detected through contact tracing, to have primary pulmonary TB, and to have a rural address.

CONCLUSION

Pediatric TB in Alberta is mainly the result of ongoing transmission in Aboriginal peoples and immigration to Canada of persons with latent TB infection. The elimination of pediatric TB will require interruption of transmission in Aboriginal peoples and prevention of disease in immigrants.

Contact investigation and genotyping to identify tuberculosis transmission to children

BACKGROUND

Tuberculosis (TB) in young children is an indicator of ongoing community transmission. We examined contact investigations related to pediatric TB, yield for source case identifications and genotypes for relevant Mycobacterium tuberculosis isolates in a low-incidence setting.

METHODS

We reviewed public health data for all patients with TB aged <18 years reported to Montreal authorities during 1996 to 2000. M. tuberculosis isolates from patients of all ages were subjected to IS6110-based genotyping, supplemented by spoligotyping, to compare isolates from children and adults during the same years.

RESULTS

Sixty-six patients aged <18 years were diagnosed with active TB from 1996 to 2000. Mean age was 11.1 years (standard deviation 6.7 years). Twenty-five children (38%) were Canadian-born, all with at least one foreign-born parent. Nineteen children were diagnosed after contact investigations of known adult cases; 8 underwent no contact investigation. For the remaining 39 children, a total of 616 contacts were identified. The median number of contacts per child was 9 (interquartile range, 6-10). Four hundred eighty-one contacts (78%) underwent tuberculin testing; 188 (39%) were reactors and 186 (39%) began treatment of latent TB. Investigations uncovered 4 probable source cases, all involving parents or other relatives. M. tuberculosis genotyping for 38 children identified up to 14 additional possible source cases; in only one was a possible epidemiologic link evident from public health records.

CONCLUSIONS

Among largely foreign-born children with active TB, contact investigations were extensive and often identified latent tuberculosis infection--but rarely source cases. However, genotyping suggested substantial, previously unrecognized transmission to children despite low overall incidence.

Epidemiology of pediatric tuberculosis using traditional and molecular techniques: Houston, Texas

OBJECTIVE

To investigate the transmission dynamics of pediatric tuberculosis (TB) by analyzing the clinical characteristics with the molecular profiles of Mycobacterium tuberculosis isolates during a 5-year period.

METHODS

A retrospective review of a prospective population-based active surveillance and molecular epidemiology project was conducted in private and public pediatric clinics within Houston and Harris County, Texas. The study population consisted of patients who had pediatric TB diagnosed from October 1, 1995, through September 30, 2000. Cases and potential source cases (PSC) were interviewed using a standardized questionnaire. Available Mycobacterium tuberculosis isolates from cases and PSCs were characterized and compared by IS6110 restriction fragment length polymorphism, spoligotyping, and genetic group assignment. Clinical characteristics were described, and molecular characterizations were compared. Data were analyzed by using EpiInfo 6.02b and SAS 8.2.

RESULTS

A total of 220 (92%) of 238 pediatric TB cases were included. Epidemiologic and clinical findings were consistent with previous studies. Molecular profiles from 3 cases did not match the profile of PSC. Four previously unknown PSCs were identified using molecular techniques. Fifty-one (71.8%) of 71 isolates matched at least 1 other Houston Tuberculosis Initiative TB database isolate and were grouped into 33 molecular clusters. Cases were more likely to be clustered when the patients were younger than 5 years, identified a source case, or were US born.

CONCLUSIONS

Traditional contact tracing may not always be accurate, and molecular characterization can lead to identification of previously unrecognized source cases. Recent transmission plays a significant role in the transmission of TB to children as evident by the high degree of clustering found in our study population.

Current issues in global tuberculosis control

Despite attempts to standardize tuberculosis (TB) control strategies, there remains wide variation in the selection and implementation of control strategies within and among nations. Some of this variation is appropriate; based on wide variations in the available resources, the prevalence of TB infection, the incidence of TB disease, the relative contribution of reactivation versus recent transmission to incident cases, and the rate of HIV co-infection. This review will discuss three controversial questions relevant to global TB control: (1) What is the role of the treatment of latent TB infection in global TB control? (2) What are successful strategies to control immigrant TB in low incidence countries? (3) What are successful strategies to control TB in persons with HIV infection?

Tuberculosis in children

The epidemiology of pediatric tuberculosis (TB) is shaped by risk factors such as age, race, immigration, poverty, overcrowding, and HIV/AIDS. Once infected, young children are at increased risk of TB disease and progression to extrapulmonary disease. Primary disease and its complications are more common in children than in adults, leading to differences in clinical and radiographic manifestations. Difficulties in diagnosing children stem from the low yield of mycobacteriology cultures and the subsequent reliance on clinical case definitions. Inadequately treated TB infection and TB disease in children today is the future source of disease in adults.

Tuberculosis in children: considerations for children from developing countries

Although accurate data are scarce for children, tuberculosis (TB) represents one of the most common infectious causes of morbidity and mortality worldwide. TB case rates have declined among children in the United States in the last decade, but they remain high among children from low-income countries and racial or ethnic minorities. Establishing the definitive diagnosis of TB in a child remains difficult and frequently relies on a constellation of history, clinical findings, and bacteriology. Recently, updated national and international treatment recommendations have been published. Contact investigation and treatment using directly observed therapy are important components of the optimal case detection and management of TB in children.

The evaluation of school-based contact investigations in New York State, exclusive of New York City, 1997-2001

Tuberculosis contact investigations conducted in school settings in New York State (exclusive of New York City) from 1997-2001 were assessed to identify current practices and develop guidance for future investigations. Site visits were made to counties where 26 school-based contact investigations were conducted during the study period. Among the 4,070 individuals tested in the first round, the skin test positivity rate was 5.1%. Second round testing of 2,886 individuals produced 102 apparent converters for a rate of 3.5%. Many school contact investigations test more people than might be expected with community-based tuberculosis contact investigations, primarily due to parental concerns and "political" pressure on school and local public health officials. The study in this article identifies tuberculin positivity rates among school children and makes recommendations to improve the contact investigation process.

Epidemiology of childhood tuberculosis in the United States, 1993-2001: the need for continued vigilance

OBJECTIVE

To describe trends and highlight epidemiologic and clinical characteristics of childhood tuberculosis (TB) in the United States.

METHODS

All verified TB cases reported to the national TB surveillance system from 1993 to 2001 were included. A child was defined as a person younger than 15 years.

RESULTS

A total of 11,480 childhood TB cases were reported. Case rates (TB cases/100,000 population) in all children declined from 2.9 (n = 1663) in 1993 to 1.5 (n = 931) in 2001. Among children, those who were younger than 5 years had the highest rate. California, Texas, and New York accounted for 48% of all childhood TB cases. In 2001, TB case rates were higher for foreign-born (12.2) than US-born children (1.1). Hispanic and non-Hispanic black children accounted for nearly three quarters of all cases. Twenty-four percent of children with TB were foreign-born children, with the largest number originating from Mexico (39.8%), the Philippines (8.6%), and Vietnam (5.7%). Most children had evidence of pulmonary TB disease (78.9%). Among culture-positive cases without previous TB, drug resistance to at least isoniazid was 7.3% and to isoniazid and rifampin was 1.6%. In 1999, 82.9% of children received directly observed therapy for at least part of their treatment and 94.8% completed treatment.

CONCLUSIONS

Although the overall TB case number among children is declining in the United States, certain groups of children (eg, younger children, racial and ethnic minorities, foreign-born) are at higher risk for TB. As the United States moves toward the elimination of TB, future efforts should endeavor to prevent all cases of childhood TB.

Global epidemiology of paediatric tuberculosis

Tuberculosis is one of the major infections affecting children worldwide. It causes significant morbidity and mortality, especially in infants and young children. Factors such as overcrowding, poverty and the HIV epidemic have all contributed to the resurgence of tuberculosis globally. The highest rates of tuberculosis occur in resource-poor countries and over the last decade case notifications in children have been increasing steadily, particularly in Sub-Saharan Africa. Mycobacterium tuberculosis infects millions of children worldwide every year, yet accurate information on the extent and distribution of disease in children is not available for most of the world. We describe some of the unique aspects of tuberculosis infection in children and review the epidemiology of disease in children worldwide.

Tuberculosis among foreign-born children in the State of Florida, 1993–1999: A re-emergence phase after a sustained decline?

STUDY OBJECTIVE

To determine the temporal trend of tuberculosis disease among foreign-born children in the State of Florida.

DESIGN AND SETTING

Descriptive population-based study on data obtained from the Tuberculosis Control and Surveillance Program in the State of Florida. We employed Poisson assumption to derive estimates for rates of tuberculosis among US-born and foreign-born children in the studied population. We also applied linear and non-linear regression equations to describe the best trajectories for observed temporal trends in incidence cases of the disease.

PATIENTS

All cases of tuberculosis disease among children notified in the State of Florida between 1993 and 1999 inclusive.

MAIN RESULTS

The incidence rate of TB over the study period was five times higher among foreign-born children (11.3 per 10(5); CI = 8.0-14.6 per 10(5)) as compared to US-born (1.7 per 10(5); CI = 0.8-4.2 per 10(5)). Whereas, new cases of TB among US-born children have continuously and significantly dropped throughout the period of study, our data indicated that the decline achieved from 1993 to 1996 among foreign-born children has ceased, and a resurgence of tuberculosis in this population was apparent.

CONCLUSIONS

Our data tend to suggest a re-emergence of tuberculosis among foreign-born children in the State of Florida as from 1997 after several years of decline. There is a need for a more in-depth investigation to elucidate and address causes responsible for the resurgence if the current battle to eliminate tuberculosis from the State is to succeed.

Completeness of pediatric TB reporting in New York City

OBJECTIVE

Accurate surveillance of tuberculosis (TB) in children is critical because such cases represent recent transmission, but surveillance is difficult as only 10% to 50% of cases are culture-confirmed. Hospital-based sources were used to develop alternative surveillance to assess completeness of reporting for pediatric TB in northern Manhattan and Harlem from 1993 through 1995.

METHODS

Alternative surveillance sources included ICD-9-CM hospital discharge codes for active TB and gastric aspirate reports. Cases identified by alternative surveillance were compared with cases previously reported to the New York City Department of Health (NYC DOH).

RESULTS

Alternative surveillance detected 25 cases of possible pediatric TB, of which four (16%) had never been reported to the NYC DOH and three (12%) had been reported as suspect cases, but had not fulfilled the criteria for a reportable case of pediatric TB. Of these seven newly counted cases, three were detected by ICD-9-CM codes, three by a gastric aspirate log book, and one by both. In contrast, 13 other cases had been reported to the NYC DOH, but were undetected by our alternative surveillance; eight of these could be verified with available medical records. Thus, the demographic and clinical characteristics of the 25 detected and the eight undetected cases with available medical records were evaluated in this study.

CONCLUSION

Alternative surveillance proved effective, was complementary to the NYC DOH surveillance efforts, and increased the number of pediatric TB cases identified during the study period by 21%.

Treatment of childhood tuberculosis with a six month directly observed regimen of only two weeks of daily therapy

BACKGROUND

Recommended treatment of childhood tuberculosis is 6 months in duration with at least 3 drugs. We studied a regimen requiring as few as 58 doses, given entirely by directly observed therapy (DOT), under program conditions.

METHODS

An observational trial was conducted to determine the effectiveness of a completely DOT 6-month regimen for pulmonary, pleural and lymph node tuberculosis in children with the use of 2 weeks of daily isoniazid, rifampin and pyrazinamide therapy; then 6 weeks of twice weekly isoniazid, rifampin and pyrazinamide therapy; followed by 16 weeks of twice weekly isoniazid and rifampin. All therapy was given by workers from the health department, and patients were followed by the Children's Tuberculosis Clinic in Houston, TX. Patients were evaluated for changes in symptoms, weight, clinical or radiographic findings and adherence to therapy.

RESULTS

Of the 175 evaluable children (159 pulmonary/thoracic node, 4 pleural, 12 cervical lymph node), 81% of children completed treatment in 6 months. Of the 33 patients who received extended treatment, 3 did so because of physician choice, 17 had an inadequate response to initial therapy, 2 had significant adverse reactions to drugs and 16 had poor adherence to the DOT. Only 37% of patients had complete resolution of disease at the end of treatment, but all continued to improve after therapy was stopped. There was only 1 patient who relapsed after 4 years.

CONCLUSION

This regimen had results comparable with those of 6-month regimens with longer durations of daily therapy. Determining treatment response in pediatric tuberculosis is difficult because of the slow resolution of chest radiograph abnormalities. DOT is an important aspect of treatment but does not solve all problems with treatment adherence.

Scrofuloderma with multiple organ involvement in a 5-year-old child

Cutaneous tuberculosis is a rare form of extrapulmonary tuberculosis seen in children in developing countries. We report a 5-year-old child with cutaneous tuberculosis with involvement of lymph nodes, lungs, and the musculoskeletal and central nervous systems, which was not clinically obvious. Antituberculous treatment led to marked clinical improvement. The importance of a thorough search for internal organ involvement in patients presenting with cutaneous tuberculosis is emphasized.

Targeted testing of children for tuberculosis: validation of a risk assessment questionnaire

OBJECTIVE

Given the directive of the American Academy of Pediatrics to test children for tuberculosis (TB) only if they are at high risk for the disease, we sought to determine how well a risk assessment questionnaire can predict a positive tuberculin skin test (TST) result among children seen in a medical office setting.

METHODS

In a prospective observational study, we identified 31 926 children who received well-child care in 18 pediatric offices of the Kaiser Permanente Northern California Region from August 1996 through November 1998 and who were due to receive a routine TST (Mantoux method) as part of universal screening. Parents were asked to complete a questionnaire about risk factors for TB infection that included demographic information. The TST result at 48 to 72 hours was compared with questionnaire responses to identify responses that were most highly associated with a positive TST result at both the 10-mm and 15-mm cutoffs. A concurrent study was conducted to determine whether parents can recognize induration.

RESULTS

This population was diverse in age (range: 0-18 years), race/ethnicity (white: 37%; Hispanic: 26.4%; Asian: 15.0%; black: 11.8%; other: 8.4%; not stated by parent: 1.6%), and household annual income (range: $10 524-$175 282). Overall incidence of positive TST results was 1.0% at the 10-mm cutoff and 0.5% at the 15-mm cutoff. Positive predictive value of selected individual risk factors at the 10-mm cutoff were: child born outside the United States, 10.4%; history of receiving bacille Calmette-Guérin vaccine, 5.5%; and child having lived outside the United States, 5.3%. Using multivariate analysis, we selected a subset of risk factors that were independently and significantly associated with a positive TST result >/=10 mm: history of receiving bacille Calmette-Guérin vaccine (odds ratio [OR]: 2.31; 95% confidence interval [CI]: 1.70-3.13); household member with history of positive TST result or TB disease (OR: 1.53; 95% CI: 1.14-2.04); child born outside the United States (OR: 8.63; 95% CI: 6.16-12.09); child having lived outside the United States (OR: 2.06; 95% CI: 1.49-2.85); and race/ethnicity reported by parent as Asian (OR: 2.28; 95% CI: 1.59-3.27) or Hispanic (OR: 1.57; 95% CI: 1.09-2.26). Several factors were not statistically significant predictors of a positive TST result: age, sex, household annual income, household member infected with human immunodeficiency virus or who had stayed in a homeless shelter, and being an adopted or foster child. Overall sensitivity of the 9 main items on the questionnaire was 80.9%; when a subset of 4 of these questions plus the race/ethnicity questions were used, sensitivity of responses was 83.5%. Parents failed to recognize positive TST results at a rate of 9.9% (for the 10-mm cutoff) and 5.9% (at the 15-mm cutoff).

CONCLUSION

A 5-question risk assessment questionnaire completed by parents can be used to accurately identify risk factors associated with TB infection in children. In our population, some risk factors suggested by the American Academy of Pediatrics could not be validated. Parents cannot be relied on to read TST results accurately. Screening for TB can be enabled by using a standardized, validated questionnaire to identify children who should be given tuberculin skin testing.

Latino child health: need for inclusion in the US national discourse

The "rediscovery" of poverty, as echoed in concepts of social inequality, has contributed to the goal of eliminating racial/ethnic and social class disparities in the United States. This commentary focuses on what we know about the pressing health care needs and issues relevant to Latino children and families and how extant knowledge can be linked to priority policy recommendations to ensure the inclusion of Latino health issues in the national discourse. A systematic review of the literature on Latino children and of expert opinion revealed 4 evidence-based themes focused on poverty: economic factors, family and community resources, health system factors, and pitfalls in Latino subgroup data collection. Consensus was found on 4 priority policy recommendations: (1) reduce poverty and increase access to health care coverage, (2) increase funding in targeted primary and preventive health care services, (3) provide funds needed to fully implement relevant health legislation, and (4) improve measurement and quality of data collection. If these recommendations are not instituted, the goals of Healthy People 2010 will not be achieved for the Latino population.

Mycobacterium bovis as a significant cause of tuberculosis in children residing along the United States-Mexico border in the Baja California region

OBJECTIVE

To determine the role of Mycobacterium bovis in active pediatric tuberculosis (TB) in a United States-Mexico border region.

METHOD

We reviewed all new cases of pediatric (<15 years old) TB presenting to San Diego hospitals and clinics from 1980 to 1997. Patients were categorized by age, ethnicity, country of origin, culture results, and disease manifestations. Case definitions were similar to those used by the Centers for Disease Control and Prevention. M bovis was distinguished from Mycobacterium tuberculosis by standard biochemical tests.

RESULTS

The median age of the 563 identified patients was 4.1 years old. The yearly incidence began rising in 1989 and peaked in the mid-1990s. Hispanics constituted 78.9% of the patients, but they were less likely to be foreign-born (21.6%) than were black children and Asian/Pacific Islanders. Overall, M bovis caused 10.8% of all TB during this period. Of the 180 patients with positive culture results, however, M bovis accounted for 33.9% and M tuberculosis 66. 1%. This high percentage of M bovis infections was largely attributable to its contribution to extrapulmonary TB (55.2% of all culture-positive specimens). M bovis patients were also even more likely to be Hispanic (90.2%), to present with extrapulmonary disease (95.1%), and to be older than 12 months (96.8%).

CONCLUSION

These data demonstrate the dramatic impact of this underappreciated cause of zoonotic TB on US children at the Mexican border and underscore the need for cross-collaboration to enforce existing Mexican pasteurization laws.

Phthisiology at the dawn of the new century

Tuberculosis (TB) has been and continues to be one of the most significant pathogens in terms of human morbidity and mortality. Although the resurgence of TB has been held in check in most developed countries, the epidemic rages on in most developing countries of the world. The specter of drug resistance is becoming a more credible challenge in many parts of the world, dimming the prospects of eventual elimination. However, great opportunities are arising as well, with an unprecedented focus on the global aspects of TB control. This article will review the status of TB today and put into perspective the prospects for its elimination in the coming century.

Costs associated with tuberculosis control programs at hospitals caring for children

OBJECTIVE

No data are available on the costs of implementing infection control measures for the control of Mycobacterium tuberculosis (MTB) in pediatric settings. In this study we determined the cost of MTB control measures at three hospitals caring for children.

DESIGN

Infection control and tuberculosis (TB) coordinators obtained cost data retrospectively for the years 1994 to 1995 for tuberculin skin test programs, respiratory protection programs and the retrofit or new construction of environmental controls in pediatric settings.

SETTING

Two pediatric hospitals and one pediatric ward in a large tertiary care hospital.

RESULTS

Total expenditures for TB controls ranged from $15270 to $28158 for the 2-year study period. Engineering controls involved the largest capital outlay at two of three facilities. Average yearly tuberculin skin test costs ranged from $949 to $12504/hospital. Respiratory protection programs cost from $480 to $1680 during the 2-year study period.

CONCLUSIONS

Costs associated with implementing control measures varied slightly by hospital but were less than those incurred by hospitals caring for adults. These costs represent improvements made to upgrade selected aspects of hospital TB control programs, not the cost of an optimal TB control program. Optimal TB control programs in pediatric settings have yet to be described.

Childhood tuberculosis in an urban population in South Africa: burden and risk factor

AIM

To study the epidemiology of childhood tuberculosis (TB) in a developing country.

SETTING

Two urban communities of Cape Town, South Africa with a TB case notification rate of 1149/100 000.

DESIGN

Retrospective descriptive study using the national population census (1991), 10 year official TB notification records, and a geographical information system.

RESULTS

The case notification rate of TB in children 0-5 years old was 3588 cases/100 000 children aged 0-5 years, 3.5 times the case notification rate in adults. Children (0-14 years) accounted for 39% of the total case load. Childhood TB case notification rate correlated with parental education (r = -0.64), annual household income (r = -0.6), and crowding (r = 0.32).

CONCLUSION

Children, especially those living in poor socioeconomic conditions, form an important epidemiological group and account for a notable proportion of the morbidity caused by TB. Efforts to improve TB control must therefore not only target adults (case detection and cure of infectious cases) but also children (screening of child contacts of adult cases) and the socioeconomic living conditions.

Diagnosis of pediatric tuberculosis in the modern era

BACKGROUND

Correctly diagnosing tuberculosis (TB) in children is critical to provide appropriate treatment and to detect undiagnosed source cases. However, diagnosing TB in children may be difficult.

OBJECTIVE

We sought to determine whether Amplicor, a Food and Drug Administration-approved polymerase chain reaction (PCR) assay used to detect Mycobacterium tuberculosis in sputum and computerized tomography (CT) would facilitate the diagnosis of TB in children. We also examined the applicability of the Centers for Disease Control and Prevention clinical case definition for TB.

SETTING

A university-affiliated pediatric hospital in New York City.

SUBJECTS

From March, 1995, to November, 1997, 27 children < 15 years of age (mean age, 3.9 years) were evaluated for suspected TB.

RESULTS

M. tuberculosis was cultured from 5 of 76 (6.6%) gastric aspirate specimens, and PCR detected M. tuberculosis DNA in 3 (4.1%) of these specimens. There was poor correlation between culture and PCR because 6 specimens were discordant. CT scans were diagnostic of mediastinal or hilar adenopathy in 6 children with equivocal or negative chest radiographs and confirmed adenopathy in 8 others. Six children received alternative diagnoses.

CONCLUSIONS

We conclude that the commercially available PCR technology had very limited utility in detecting M. tuberculosis from gastric aspirates, but CT scans were useful in assessing pediatric patients with suspected TB.

APIC and CDC survey of Mycobacterium tuberculosis isolation and control practices in hospitals caring for children. Part 1: Patient and family isolation policies and procedures. Association for Professionals in Infection and Epidemiology, Inc

BACKGROUND

The 1994 Centers for Disease Control and Prevention draft Guidelines for Preventing the Transmission of Mycobacterium tuberculosis in Health-Care Facilities did not exempt pediatric facilities from instituting controls to prevent nosocomial tuberculosis (TB) transmission. Many researchers contend that TB disease in children does not require such rigid controls. We surveyed acute-care pediatric facilities in the United States to determine adherence to patient and family isolation policies and procedures.

METHODS

The study included 4 mailings of a survey to infection control professionals at 284 US children's hospitals and adult acute-care hospitals with > 30 pediatric beds.

RESULTS

The overall response rate was 69%. Only 41% of respondents reported having a written TB policy specifically designed for pediatric patients. Whereas 98% of respondents isolated pediatric patients with confirmed pulmonary TB, only 69% reported isolation of patients with miliary TB, and 79% reported isolation of patients with positive gastric aspirates. TB isolation policies for adult visitors were in place at 69% of hospitals, and 50% of hospitals evaluated adults for TB as part of the child's TB treatment plan. A median of 3 contact investigations occurred at each of 47% of respondent hospitals in the preceding 5 years.

CONCLUSIONS

Isolation and infection control policies for children with pulmonary TB largely conformed to published guidelines but varied for children with nonpulmonary TB. Because the greatest risk of nosocomial TB transmission in pediatric facilities comes from adults with TB, a rapid TB screening process for parents and adult contacts accompanying affected children should be instituted at facilities caring for children.

Childhood tuberculosis in a Scandinavian metropolitan area 1984-93

This study was undertaken to describe the epidemiology, clinical manifestations and prognosis of childhood tuberculosis in Copenhagen, with special attention to differences between Danish children and children of foreign origin. From 1984-93, 66 children, aged 0-14 years, in the Copenhagen area were notified for tuberculosis. More than two-thirds of the children of foreign origin, including 5 patients from Greenland, who were transferred to Denmark for treatment. A close adult contact with contagious tuberculosis was identified in only a few patients born to foreign parents, but more than one-third had travelled to their homeland within 1 y prior to diagnosis. 48 patients (73%) were reported to have only respiratory tuberculosis. Tuberculosis located in cervical lymph glands was the most frequent nonrespiratory manifestation, but was found only in children of foreign origin. Five patients had meningitis. The high incidence among foreign children reflects the incidence in their home countries, but poorer and more crowded living conditions among ethnic minorities in Denmark may also facilitate transmission of tuberculosis. Severe manifestations of tuberculosis still occur, even in a low incidence country.

Evaluation of transmission of Mycobacterium tuberculosis in a pediatric setting

OBJECTIVE

To determine the extent of transmission of Mycobacterium tuberculosis to pediatric patients exposed to a pediatrician with smear- and culture-positive pulmonary tuberculosis (TB).

METHODS

Clinic billing and hospital admission records were used to identify patients seen during the pediatrician's infectious period. Patients were notified of the potential exposure and were offered screening.

RESULTS

A total of 1416 pediatric patients were identified as exposed. Of the 606 who completed screening, 12 (2%) had a skin test result > or = 10 mm, 2 (0.3 had a result 5 to 9 mm, and 592 (98%) had a negative test result (0 to 4 mm). No active TB cases were identified. Of the 14 children with a skin test result > or = 5 mm, 7 were U.S.-born and had no other risk for a positive skin test. The remaining seven had either been exposed to another person with infections TB or were from countries with a high prevalence of TB.

CONCLUSION

We found evidence of limited transmission of Mycobacterium tuberculosis in the outpatient pediatric setting. Despite extensive resources dedication, only 43% of exposed children completed screening. In similar situations decision should balance the responsibility to protect children exposed to Mycobacterium tuberculosis with other public health priorities and available resources.

Tuberculosis in children and adolescents: California, 1985 to 1995

OBJECTIVES

To describe the epidemiology and clinical characteristics of tuberculosis (TB) among children and adolescents and to define children at risk for TB.

SETTING

4607 children 0 to 14 years of age and 1615 adolescents 15 to 19 years of age reported with TB in California.

METHODS

We analyzed surveillance data reported to the California Department of Health Services TB Control Branch from 1985 through 1995.

RESULTS

TB cases increased 22% among children 0 to 4 years of age and 66% among children 5 to 14 from 1985 through 1995. Case rates were highest among children 0 to 4 years of age (13/ 100000 children), but declined from 1993 to 1995, except for black children 0 to 4 years of age. Minority children 0 to 14 years of age had case rates 6- to 34-fold higher than did white children. Pulmonary TB was the most common site of disease in all age groups (71 to 82%). TB meningitis was most common in children 0 to 4 years of age (5%). Most children (64%) did not have cultures done; however, among culture-proved cases isoniazid-resistant Mycobacterium tuberculosis was isolated in 7%. Adolescents were more likely to have cavitary pulmonary disease (24%), to be foreign-born (78%) or homeless (4%) and to have an isoniazid-resistant strain isolated (13%) than were children 0 to 14 years of age (P < 0.05).

CONCLUSIONS

TB in children and adolescents increased substantially in the mid-1980s and early 1990s. Pediatric TB remains a serious health problem, especially among minority children and adolescents. Our findings indicate that TB control programs need improved strategies to prevent infection and detect disease in this population.

Risk factors for pediatric tuberculosis infection and disease after household exposure to adult index cases in Alaska

OBJECTIVES

To determine risk factors for pediatric tuberculosis infection and active tuberculosis.

STUDY DESIGN

We examined medical records from multiple sources for all 282 children younger than 15 years in Alaska during the period 1987 to 1994 who were household contacts of an adult with culture-positive pulmonary tuberculosis.

RESULTS

Infection developed in 25% of the children and progressed to active disease in 9.6%. Risk factors for pediatric infection included exposure to a parent who had active tuberculosis and exposure to any adult with active tuberculosis who had a cough, smear positivity, or a left upper lobe (LUL) chest lesion (odds ratios, 2.1 to 2.8). Among the 71 children in whom infection developed, Alaska Natives and younger children were more likely to progress to active tuberculosis, as were children exposed to a parent who had active tuberculosis and children exposed to any adult who had a LUL chest lesion (odds ratios, 1.5 to 12).

CONCLUSIONS

Although all children with household exposure to adults with active tuberculosis have a high risk of contracting the infection and disease, specific risk factors can be identified and differ for infection and disease. Alaska Natives have an increased risk of progression to disease once infected.

Infection control challenges in child-care centers

The child-care environment predisposes young children to infection with a variety of pathogens. Factors contributing to increased incidence of certain infections include age-specific hygiene behaviors, immunologic immaturity of young children, and exposure to pathogens with high infectivity. Respiratory tract and enteric pathogens are responsible for most illnesses, but a number of other agents are also important. Hygienic interventions, especially handwashing, remain important in infection control, but maintenance of appropriate immunization levels plays a crucial role in disease prevention in the child-care setting. Future interventions will center on development of new vaccines to eliminate susceptibility of young children to as many infectious agents as possible and continued evaluation of other preventive measures.

Epidemiology of pediatric tuberculosis in Chicago, 1974 to 1994: a continuing public health problem

Despite downward trends in the overall rate of tuberculosis in the United States for 1993 to 1994, the rate among children (0 to 14 years) has increased. To evaluate the trend in pediatric tuberculosis in Chicago and better direct public health efforts to control tuberculosis, we analyzed summary data for 1974 to 1981 and detailed data for 1982 to 1994 from surveillance case reports. These data were compared to the 1980 and 1990 census data for the 77 community areas in Chicago. Of the 18,700 cases of tuberculosis reported in Chicago for the study period, 702 (3.8%) occurred in children. Children accounted for a significantly increasing proportion of reported cases, 204/7093 (2.9%) in 1974 to 1981 versus 498/11,607 (4.3%) in 1982 to 1994, a trend which began in 1982. The number of cases among immigrants remained low throughout the study. Sites of infection were as follows: 73% pulmonary parenchymal disease, 9% hilar adenopathy, 9% extrathoracic lymph adenopathy, 3% meningitis, 3% miliary, and 3% other. From 1982 to 1994, 13 communities had a total of 224 cases (45%); average rates were > 10/100,000 in the population under 15 years old, and 7 of these communities had 127 cases (25%); average rates were > 15/100,000. Of the 77 community areas, 16 (21%) had no pediatric tuberculosis. Comparison of case rates with socioeconomic and health indicators showed the highest rates in communities with multiple indicators of poverty, including overcrowded housing units, low median income, and high infant mortality rates. Pediatric tuberculosis in Chicago remains a significant public health problem. Efforts to address this problem should provide resources to the community areas with the highest incidence rates.

Unique aspects of tuberculosis in the pediatric population

Therapeutic drug monitoring is a process that allows clinicians to quantitate and control drug therapy. Serum concentration data allow for the explicit determination of pharmacokinetic and pharmacodynamic parameters for individual patients. This information assists the clinician in designing treatment regimens that produce a therapeutic response while minimizing avoidable toxicity. In particular, patients with clinically advanced mycobacterial infections, those with infections caused by strains of M. tuberculosis with acquired drug resistance, or species of nontuberculosis which are inherently drug-resistant, and those with co-morbid conditions such as AIDS may benefit from this process.