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Role of viruses and atypical bacteria in asthma exacerbations among children in Oporto (Portugal).
Allergol Immunopathol (Madr). 2007 Jan-Feb; 35(1):4-9.AI

Abstract

BACKGROUND

Upper respiratory tract infections are known to be a significant precipitant of acute asthma exacerbations. The aim of this study was to evaluate seasonal trends and the role of these pathogens in asthma exacerbations in school-aged children from Oporto (Portugal).

METHODS

Nasal aspirates were collected from children aged 6 to 12 years old with asthma exacerbations attended in the Pediatric Emergency Department one day per week from January 1 to December 31, 2003. Demographic data, severity of asthma and asthma exacerbations, and current treatment were recorded. Samples were obtained through nasal wash with 1 ml saline and were processed by immunofluorescence assays (respiratory syncytial virus, adenovirus, parainfluenza and influenza virus), retrotranscription polymerase chain reaction (rhinovirus) and polymerase chain reaction (enterovirus, Chlamydia pneumoniae and Mycoplasma pneumoniae).

RESULTS

In 54 eligible children, 37 nasal samples were obtained. Infectious agents were detected in 78 % of the patients. Rhinovirus was detected in 70.3 %, Mycoplasma pneumoniae in 16.2 %, enterovirus in 10.8 %, and Chlamydia pneumoniae in 2.7 %. Coinfection was identified in 21.6 % of the samples. There was no significant correlation between current treatment status, severity of asthma or exacerbations and the isolated agents. Two distinct peaks of asthma exacerbation were found, 40.5 % in spring and 32.4 % in autumn [corrected] The highest number of cases was recorded in March and the lowest in August and January. Rhinoviruses was detected in 27 % of the cases in autumn and in 24.3 % in spring [corrected]

CONCLUSIONS

These results confirm the previously reported high frequency of rhinovirus detection in asthma exacerbations in children and provide evidence that asthma exacerbations and rhinovirus infections follow a seasonal pattern, occurring mostly in spring and autumn. The findings also underscore the frequency of Mycoplasma pneumoniae detection, and emphasize the importance of this agent as a possible trigger of asthma exacerbations.

Authors+Show Affiliations

Department of Pediatrics, Hospital de São João, Oporto, Portugal. martajoaosilva@iol.ptNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17338895

Citation

João Silva, M, et al. "Role of Viruses and Atypical Bacteria in Asthma Exacerbations Among Children in Oporto (Portugal)." Allergologia Et Immunopathologia, vol. 35, no. 1, 2007, pp. 4-9.
João Silva M, Ferraz C, Pissarra S, et al. Role of viruses and atypical bacteria in asthma exacerbations among children in Oporto (Portugal). Allergol Immunopathol (Madr). 2007;35(1):4-9.
João Silva, M., Ferraz, C., Pissarra, S., Cardoso, M. J., Simões, J., & Bonito Vítor, A. (2007). Role of viruses and atypical bacteria in asthma exacerbations among children in Oporto (Portugal). Allergologia Et Immunopathologia, 35(1), 4-9.
João Silva M, et al. Role of Viruses and Atypical Bacteria in Asthma Exacerbations Among Children in Oporto (Portugal). Allergol Immunopathol (Madr). 2007 Jan-Feb;35(1):4-9. PubMed PMID: 17338895.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Role of viruses and atypical bacteria in asthma exacerbations among children in Oporto (Portugal). AU - João Silva,M, AU - Ferraz,C, AU - Pissarra,S, AU - Cardoso,M J, AU - Simões,J, AU - Bonito Vítor,A, PY - 2007/3/7/pubmed PY - 2007/5/26/medline PY - 2007/3/7/entrez SP - 4 EP - 9 JF - Allergologia et immunopathologia JO - Allergol Immunopathol (Madr) VL - 35 IS - 1 N2 - BACKGROUND: Upper respiratory tract infections are known to be a significant precipitant of acute asthma exacerbations. The aim of this study was to evaluate seasonal trends and the role of these pathogens in asthma exacerbations in school-aged children from Oporto (Portugal). METHODS: Nasal aspirates were collected from children aged 6 to 12 years old with asthma exacerbations attended in the Pediatric Emergency Department one day per week from January 1 to December 31, 2003. Demographic data, severity of asthma and asthma exacerbations, and current treatment were recorded. Samples were obtained through nasal wash with 1 ml saline and were processed by immunofluorescence assays (respiratory syncytial virus, adenovirus, parainfluenza and influenza virus), retrotranscription polymerase chain reaction (rhinovirus) and polymerase chain reaction (enterovirus, Chlamydia pneumoniae and Mycoplasma pneumoniae). RESULTS: In 54 eligible children, 37 nasal samples were obtained. Infectious agents were detected in 78 % of the patients. Rhinovirus was detected in 70.3 %, Mycoplasma pneumoniae in 16.2 %, enterovirus in 10.8 %, and Chlamydia pneumoniae in 2.7 %. Coinfection was identified in 21.6 % of the samples. There was no significant correlation between current treatment status, severity of asthma or exacerbations and the isolated agents. Two distinct peaks of asthma exacerbation were found, 40.5 % in spring and 32.4 % in autumn [corrected] The highest number of cases was recorded in March and the lowest in August and January. Rhinoviruses was detected in 27 % of the cases in autumn and in 24.3 % in spring [corrected] CONCLUSIONS: These results confirm the previously reported high frequency of rhinovirus detection in asthma exacerbations in children and provide evidence that asthma exacerbations and rhinovirus infections follow a seasonal pattern, occurring mostly in spring and autumn. The findings also underscore the frequency of Mycoplasma pneumoniae detection, and emphasize the importance of this agent as a possible trigger of asthma exacerbations. SN - 0301-0546 UR - https://www.unboundmedicine.com/medline/citation/17338895/Role_of_viruses_and_atypical_bacteria_in_asthma_exacerbations_among_children_in_Oporto__Portugal__ L2 - http://www.elsevier.es/en/linksolver/ft/ivp/0301-0546/35/4 DB - PRIME DP - Unbound Medicine ER -