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2016 ; 63
(suppl 4
): S181-S186
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English Wikipedia
Comparing the Yield of Nasopharyngeal Swabs, Nasal Aspirates, and Induced Sputum
for Detection of Bordetella pertussis in Hospitalized Infants
#MMPMID27838671
Nunes MC
; Soofie N
; Downs S
; Tebeila N
; Mudau A
; de Gouveia L
; Madhi SA
Clin Infect Dis
2016[Dec]; 63
(suppl 4
): S181-S186
PMID27838671
show ga
BACKGROUND: ?Advances in molecular laboratory techniques are changing the
landscape of Bordetella pertussis illness diagnosis. Polymerase chain reaction
(PCR) assays have greatly improved the sensitivity detection and the turnaround
time to diagnosis compared to culture. Moreover, different respiratory specimens,
such as flocked nasopharyngeal swabs (NPSs), nasopharyngeal aspirates (NPAs), and
induced sputum, have been used for B. pertussis detection, although there is
limited head-to-head comparison to evaluating the PCR yield from the 3 sampling
methods. METHODS: ?Hospitalized infants <6 months of age who fulfilled a broad
syndromic criteria of respiratory illness were tested for B. pertussis infection
by PCR on paired NPSs and NPAs; or paired NPSs and induced sputum. An exploratory
analysis of B. pertussis culture was performed on induced sputum specimens and in
a subset of NPSs. RESULTS: ?From November 2014 to May 2015, 484 infants with
paired NPSs and NPAs were tested; 15 (3.1%) PCR-confirmed pertussis cases were
identified, 13 of which were PCR positive on both samples, while 1 each were
positive only on NPS or NPA. From March to October 2015, 320 infants had NPSs and
induced sputum collected, and 11 (3.4%) pertussis cases were identified by PCR,
including 8 (72.7%) positive on both samples, 1 (9.1%) only positive on NPS, and
2 (18.2%) only positive on induced sputum. The 3 types of specimens had similar
negative predictive value >99% and sensitivity >83%. Compared to PCR, culture
sensitivity was 60% in induced sputum and 40% in NPSs. CONCLUSIONS: ?Flocked
nasopharyngeal swabs, nasopharyngeal aspirates, and induced sputum performed
similarly for the detection of B. pertussis infection in young infants by PCR.