ABSTRACT
OBJECTIVES: To assess the performance of interferon-gamma release assays (IGRAs) in the differential diagnosis between Mycobacterium avium complex (MAC) and tuberculosis (TB) in children affected with subacute/chronic submandibular/cervical lymphadenitis. STUDY DESIGN: Multicenter observational study comparing children with microbiologically confirmed MAC lymphadenitis from the European NontuberculouS MycoBacterial Lymphadenitis in childrEn study with children with TB lymphadenitis from the Spanish Network for the Study of Pediatric TB database. RESULTS: Overall, 78 patients with MAC and 34 with TB lymphadenitis were included. Among MAC cases, 44 out of 74 (59.5%) had positive tuberculin skin test (TST) results at the 5-mm cut-off, compared with 32 out of 33 (97%) TB cases (P < .001); at the 10-mm cut-off TST results were positive in 23 out of 74 (31.1%) vs 26 out of 31 (83.9%), respectively (P < .001). IGRA results were positive in only 1 out of 32 (3.1%) patients with MAC who had undergone IGRA testing, compared with 21 out of 23 (91.3%) TB cases (P < .001). Agreement between TST and IGRA results was poor in MAC (23.3%; κ = 0.017), but good in TB cases (95.6%; κ = 0.646). IGRAs had a specificity of 96.9% (95% CI 84.3%-99.8%), positive predictive value of 95.4% (95% CI 78.2%-99.8%), and negative predictive value of 93.9% (95% CI 80.4%-98.9%) for TB lymphadenitis. CONCLUSIONS: In contrast to TST, IGRAs have high specificity, negative predictive value, and positive predictive value for TB lymphadenitis in children with subacute/chronic lymphadenopathy, and consequently can help to discriminate between TB and MAC disease. Therefore, IGRAs are useful tools in the diagnostic work-up of children with lymphadenopathy, particularly when culture and polymerase chain reaction results are negative.
Subject(s)
Interferon-gamma Release Tests , Mycobacterium avium Complex/isolation & purification , Mycobacterium avium-intracellulare Infection/diagnosis , Mycobacterium bovis/isolation & purification , Mycobacterium tuberculosis/isolation & purification , Tuberculosis, Lymph Node/diagnosis , Child , Child, Preschool , Cross-Sectional Studies , Diagnosis, Differential , Female , Humans , Male , Predictive Value of Tests , SpainABSTRACT
Nontuberculous mycobacteria (NTM) increasingly are recognized as opportunistic pathogens of humans. NTM species distribution is well documented in Europe and North America, but data from other regions are scarce. We assessed NTM isolation frequency and species distribution in Uruguay during 2006-2018.
Subject(s)
Mycobacterium Infections, Nontuberculous , Nontuberculous Mycobacteria , Europe , Humans , Mycobacterium Infections, Nontuberculous/epidemiology , North America , Uruguay/epidemiologyABSTRACT
BACKGROUND: Postoperative infections with non-tuberculous mycobacteria (NTM) are rare. Early diagnosis is important so tailored antibiotic therapy can be started. This can prevent unnecessary radiological and surgical interventions. CASE DESCRIPTION: A 40-year old woman underwent abdominoplasty and liposuction in Colombia. One and a half months postoperatively, she presented with a wound dehiscence followed by recurrent subcutaneous abscesses. She received multiple antibiotic courses and drainage procedures. Standard bacterial cultures remained negative. One and a half years later another abscess was drained and cultures grew Mycobacterium abscessus. Tailored antibiotic therapy was initiated and so far no large abscesses have re-occurred. CONCLUSION: Infections with NTM should be part of the differential diagnosis in patients with postoperative wound infections, especially after cosmetic surgery performed in Latin America and the Caribbean. Unsuccessful wound healing, infection recurrence, sterile standard bacterial cultures and the lack of response to conventional antibiotic regimens should raise the suspicion of an NTM infection.