[Show abstract][Hide abstract] ABSTRACT: Two commercial polymerase chain reaction (PCR) assays (a real-time PCR [Cepheid] and an oligochromatographic test [Speed-oligo]) and 1 serology test (Serodia-Myco II) for detecting Mycoplasma pneumoniae in nasopharyngeal aspirates and serum samples were studied. Among the 145 samples, 32 serum pairs were serologically positive for M. pneumoniae. Of these, in 30 nasopharyngeal aspirates, M. pneumoniae was detected using the real-time PCR assay and 25 using Speed-oligo, corresponding to a sensitivity of 93.7% and 78.1%, respectively. Among the 94 samples with negative serology, we only obtained 1 positive result by real-time PCR assay. In the group of samples from healthy children, no positive results were obtained.
[Show abstract][Hide abstract] ABSTRACT: The outbreak of pandemic influenza A (H1N1) 2009 virus caused the first influenza pandemic disease of the 21st century. In August 2010, the pandemic moved into the post-pandemic period. However, localized outbreaks of various magnitudes continued with a higher rate of disease severity. The aim of this study was to assess a new polymerase chain reaction (PCR)-oligochromatographic assay (Speed-Oligo) in the diagnosis of novel influenza A (H1N1) 2009. A total of 405 nasopharyngeal aspirate specimens from 400 pediatric and adults patients with suspected infection of pandemic influenza A (H1N1) 2009 were analyzed. The sensitivity and specificity values of the Speed-Oligo assay in comparison to reverse transcriptase-PCR assay developed by the Centers for Disease Control and Prevention were 86.5% and 92.2%, respectively. The new assay is simple, rapid, and provides a good sensitivity for detection of influenza A (H1N1) 2009. This assay might be a good alternative to real-time PCR assays for laboratories not equipped with real-time PCR instruments.
[Show abstract][Hide abstract] ABSTRACT: Nasopharyngeal aspirates collected during outbreak of novel influenza A (H1N1) virus in Barcelona, were tested to compare the accuracy of a rapid antigen-based rapid test (Binax) with rRT-PCR assay developed by CDC. Sensitivity, specificity and positive predictive value (PPV) of rapid test are more elevated in patients lower than 18 years old and during the acute stage of epidemic, than adult patients.
Clinical Microbiology and Infection 10/2010; · 4.58 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Human metapneumovirus (hMPV) is associated with acute respiratory tract infections, mainly in paediatric patients. The aim of this study was to evaluate the usefulness of two new commercial techniques available for the detection of hMPV in clinical samples from children: an enzyme immunoassay, hMPV EIA (Biotrin International Ltd), and a molecular assay, real-time RT-PCR (Pro hMPV Real Time Assay Kit; Prodesse). A total of 184 nasopharyngeal aspirate specimens from 173 children aged less than 5 years who were hospitalized with acute wheezing were analysed. Respiratory syncytial virus was detected in 27% of the samples, followed by influenza A virus (6%), parainfluenza virus (PIV)3 (2.2%), adenovirus (2%), PIV1 (1.1%), PIV2 (1.1%), and influenza B virus (0.5%). The presence of hMPV was tested in all samples, using the real-time RT-PCR and EIA. Real-time RT-PCR detected 13 hMPV-positive samples (8%), and EIA detected 17 (9.3%). When the EIA results were compared with those of real-time RT-PCR for the detection of hMPV, a good correlation was found (94%). A relatively low co-infection rate (15%) was observed in our patients. RT-PCR and EIA provide robust methods for the diagnosis of hMPV infection in children.
Clinical Microbiology and Infection 02/2010; 16(11):1663-8. · 4.58 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: We have evaluated the quantitative T-cell response after specific Mycobacterium tuberculosis antigen stimulation in active tuberculosis (TB) and latent TB infection (LTBI) patients. In adults, the median number of T cells after RD1 antigen stimulation was significantly higher in active TB patients than in LTBI patients. In children, the number of responder T cells against the specific antigens was higher in active TB than in LTBI patients, although the differences were not significant. In summary, in patients with suspected clinical TB, although there is overlapping in the number of responder T cells between both groups, a T-cell count above the described threshold could suggest active TB, especially in patients with a high probability of having active TB and low probability of having LTBI. In addition, the results are consistent with the current evidence that T-cell response may indicate mycobacterial burden and disease activity.
[Show abstract][Hide abstract] ABSTRACT: The aim of the study was to assess a new latex agglutination (LA) stool antigen assay (PYLOGEN; CerTest Biotec, Zaragoza, Spain) in the diagnosis of Helicobacter pylori infection and to monitor its eradication after treatment. The LA test has been approved for sale in Europe, and its approval from the US Food and Drug Administration is still pending. The individuals enrolled were classified into 3 groups of patients: Group 1 consisted of 38 patients who are H. pylori positive. The diagnosis of H. pylori infection was established if there was concordance between 2 test results (urea breath test [UBT], rapid urease test, and histopathologic study) or if the culture alone was positive. Patients with only 1 positive test were considered indeterminate and were excluded from the study. Group 2 comprised 9 patients without positive tests and who were considered to be H. pylori negative. Group 3 consisted of 57 patients who received eradication treatment. The sensitivity and specificity of the test were 78.9% and 100%, respectively. The results of the UBT of the patients were studied 6 weeks after eradication therapy. The sensitivity and specificity of the LA test relative to UBT for patients after treatment were 75% and 93.3%, respectively.