Was non-severe pneumonia (239/362:66.0 ), followed by severe pneumonia (77/362:21.3 ) and very severe pneumonia (46/362:12.7 ). RSV-associated pneumonia was more severe in the youngest age group, with 24/26 (92.3 ) of infants less than two months having severe disease. There was no association with severity of the pneumonia and the 2?1 month age group (p = 0.7). In the 12 month age group there was an association with non-severe disease, with 116/155 (74.8 ) KS 176 web episodes being non severe pneumonia (p = 0.002).Ethics StatementEthical approval was granted by the Ethics Committee of The Faculty of Tropical Medicine, Mahidol University, Thailand (MUTM 2009-306) and the Oxford Tropical Research Ethics Committee, Oxford University, UK (031-06). All women gave written informed consent to participate in the study.Multiple EpisodesMultiple episodes of RSV-associated pneumonia were common. Two hundred and ninety eight children had at least one episode: 50 of these (16.8 ) had two episodes and 7/298 (2.3 ) had three episodes. Subsequent episodes of RSV-associated pneumonia occurred in the older age groups, with no second episode occurring in infants less than two months of age and no third episode occurring in children aged less than one year (Figure 2). The first episode of RSV associated pneumonia was not associated with more severe disease as compared to subsequent episodes (p = 0.4). Multiple episodes of clinical pneumonia were also common: 206/298 (69.1 ) of RSV-associated pneumonia represented the child’s first episode of pneumonia, although the range was the first to the FCCP chemical information seventh episode.Results PopulationOf the 965 infants included in the cohort, 955 were live born; the neonatal mortality rate was 26.2 per 1000 live births and the infant mortality rate 30.4 per 1000 live births. Only one child died of complications of pneumonia (in addition to a congenital abnormality). Relocation of refugees to the USA led to 290 infants being lost to follow up over the two year study period. However, there were a total of 18,449 follow up visits, with a mean of 19 follow up visits per child.IncidenceThere were a total of 1,085 episodes of clinical pneumonia diagnosed in the cohort and RSV was detected in 362 (33.4 ) of these episodes. The median RSV cT value in those NPA specimens considered positive was 18.1 (IQR 15.5?3.4) and only 6.4 (23/362) had cT values 35. The incidence of RSVassociated pneumonia was 0.24 (95 CI 0.22?.26) episodes per child year. The highest incidence was 0.26 (95 CI 0.23?.30) episodes per child year in the 2?1 month age group, compared with 0.23 (95 CI 0.20?.27) in the 12 months age group (95 CI 0.20?.27) and 0.17 (95 CI 0.11?.24) in the under two month age group. However, RSV was detected in 26/48 (54.2 ) of all the pneumonia episodes that occurred in children less than two months of age. In the younger age group there were more boys than girls (57.7 vs 42.3 ) but this did not reach statistical significance (p = 0.4). There was also no statistical association between the age at which the child or infant had RSV-associated pneumonia and birth weight or gestation, although there was a trend to significance between developing pneumonia aged 2?1 months and being born prematurely (p = 0.06) (Table 1).Clinical FeaturesClinical signs associated with lower respiratory tract infection were analysed to determine whether they were predictive of RSV infection. Of the 12 1662274 clinical signs assessed, five were significantly associated with RS.Was non-severe pneumonia (239/362:66.0 ), followed by severe pneumonia (77/362:21.3 ) and very severe pneumonia (46/362:12.7 ). RSV-associated pneumonia was more severe in the youngest age group, with 24/26 (92.3 ) of infants less than two months having severe disease. There was no association with severity of the pneumonia and the 2?1 month age group (p = 0.7). In the 12 month age group there was an association with non-severe disease, with 116/155 (74.8 ) episodes being non severe pneumonia (p = 0.002).Ethics StatementEthical approval was granted by the Ethics Committee of The Faculty of Tropical Medicine, Mahidol University, Thailand (MUTM 2009-306) and the Oxford Tropical Research Ethics Committee, Oxford University, UK (031-06). All women gave written informed consent to participate in the study.Multiple EpisodesMultiple episodes of RSV-associated pneumonia were common. Two hundred and ninety eight children had at least one episode: 50 of these (16.8 ) had two episodes and 7/298 (2.3 ) had three episodes. Subsequent episodes of RSV-associated pneumonia occurred in the older age groups, with no second episode occurring in infants less than two months of age and no third episode occurring in children aged less than one year (Figure 2). The first episode of RSV associated pneumonia was not associated with more severe disease as compared to subsequent episodes (p = 0.4). Multiple episodes of clinical pneumonia were also common: 206/298 (69.1 ) of RSV-associated pneumonia represented the child’s first episode of pneumonia, although the range was the first to the seventh episode.Results PopulationOf the 965 infants included in the cohort, 955 were live born; the neonatal mortality rate was 26.2 per 1000 live births and the infant mortality rate 30.4 per 1000 live births. Only one child died of complications of pneumonia (in addition to a congenital abnormality). Relocation of refugees to the USA led to 290 infants being lost to follow up over the two year study period. However, there were a total of 18,449 follow up visits, with a mean of 19 follow up visits per child.IncidenceThere were a total of 1,085 episodes of clinical pneumonia diagnosed in the cohort and RSV was detected in 362 (33.4 ) of these episodes. The median RSV cT value in those NPA specimens considered positive was 18.1 (IQR 15.5?3.4) and only 6.4 (23/362) had cT values 35. The incidence of RSVassociated pneumonia was 0.24 (95 CI 0.22?.26) episodes per child year. The highest incidence was 0.26 (95 CI 0.23?.30) episodes per child year in the 2?1 month age group, compared with 0.23 (95 CI 0.20?.27) in the 12 months age group (95 CI 0.20?.27) and 0.17 (95 CI 0.11?.24) in the under two month age group. However, RSV was detected in 26/48 (54.2 ) of all the pneumonia episodes that occurred in children less than two months of age. In the younger age group there were more boys than girls (57.7 vs 42.3 ) but this did not reach statistical significance (p = 0.4). There was also no statistical association between the age at which the child or infant had RSV-associated pneumonia and birth weight or gestation, although there was a trend to significance between developing pneumonia aged 2?1 months and being born prematurely (p = 0.06) (Table 1).Clinical FeaturesClinical signs associated with lower respiratory tract infection were analysed to determine whether they were predictive of RSV infection. Of the 12 1662274 clinical signs assessed, five were significantly associated with RS.
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