Concurrent detection of other respiratory viruses in children shedding viable human respiratory syncytial virus.

Human respiratory syncytial virus (HRSV) is an important cause of respiratory disease. The majority of studies addressing the importance of virus co-infections to the HRSV-disease have been based on the detection of HRSV by RT-PCR, which may not distinguish current replication from prolonged shedding of remnant RNA from previous HRSV infections. To assess whether co-detections of other common respiratory viruses are associated with increased severity of HRSV illnesses from patients who were shedding viable-HRSV, nasopharyngeal aspirates from children younger than 5 years who sought medical care for respiratory infections in Ribeirão Preto (Brazil) were tested for HRSV by immunofluorescence, RT-PCR and virus isolation in cell culture. All samples with viable-HRSV were tested further by PCR for other respiratory viruses. HRSV-disease severity was assessed by a clinical score scale. A total of 266 samples from 247 children were collected and 111 (42%) were HRSV-positive. HRSV was isolated from 70 (63%), and 52 (74%) of them were positive for at least one additional virus. HRSV-positive diseases were more severe than HRSV-negative ones, but there was no difference in disease severity between patients with viable-HRSV and those HRSV-positives by RT-PCR. Co-detection of other viruses did not correlate with increased disease severity. HRSV isolation in cell culture does not seem to be superior to RT-PCR to distinguish infections associated with HRSV replication in studies of clinical impact of HRSV. A high rate of co-detection of other respiratory viruses was found in samples with viable-HRSV, but this was not associated with more severe HRSV infection.

Human bocavirus respiratory infections in children.

Human bocavirus (HBoV) was recently identified in respiratory samples from patients with acute respiratory infections and has been reported in different regions of the world. To the best of our knowledge, HBoV has never been reported in respiratory infections in Brazil. Nasopharyngeal aspirates were collected from patients aged <5 years hospitalized in 2005 with respiratory infections in Ribeirão Preto, southeast Brazil, and tested by polymerase chain reaction (PCR) for HBoV. HBoV-positive samples were further tested by PCR for human respiratory syncytial virus, human metapneumovirus, human coronaviruses 229E and OC43, human influenza viruses A and B, human parainfluenza viruses 1, 2 and 3, human rhinovirus and human adenovirus. HBoV was detected in 26/248 (10.5%) children of which 21 (81%) also tested positive for other respiratory viruses. Despite the high rates of co-infections, no significant differences were found between HBoV-positive patients with and without co-infections with regard to symptoms.

[Etiological profile of bacterial meningitis in a small hospital] / Perfil etiológico das meningites bacterianas em um hospital de pequeno porte.

OBJECTIVE: To determine the etiologic profile of cases of meningitis treated at a small hospital in Ribeirão Preto, State of São Paulo, and to compare it to those reported for other communities.METHODS: a retrospective study was conducted on 103 patients admitted from January 1992 to July 1996 with clinical and laboratory diagnosis of bacterial meningitis. The clinical criteria for diagnosis were based on patient history and physical signs and symptoms, and the laboratory criteria were based on cerebrospinal fluid examination (aspect, cytology, biochemistry, Gram staining, culture and countercurrent immunoelectrophoresis) and blood culture.RESULTS: The etiologic agent was identified in 81.5% of cases: Haemophilus influenzae type b in 32%, Neisseria meningitides in 25.2%, Streptococcus pneumoniae in 8.7%, Staphylococcus aureus and epidermidis in 8.7%, and others agents in 6.9%. CONCLUSIONS: The study showed that the cases of bacterial meningitis treated at the Santa Lydia Hospital of Ribeirão Preto are caused by the same agents detected in other places, with Haemophilus influenzae type b being the predominant one. The study also suggests that when many people are involved in the collection of material for laboratory tests, recovery of the agent may become difficult.