Author: Freitas, André Ricardo Ribas; Donalisio, Maria Rita
Title: Respiratory syncytial virus seasonality in Brazil: implications for the immunisation policy for at-risk populations Document date: 2016_5_23
ID: 0ss52vfd_23
Snippet: Seasonality: time series -wavelet and Fourier analysis -Wavelet analysis permitted identifying a strong tendency for RSV annual cycles in all regions of the country; in addition one can suspect a lower second wave peak, especially in the early years of the series. It is unstable and not statistical significant, but present in Figs 1-3. This evidence may indicate a biannual (semiannual) periodicity, that is, six months after the main peak. This se.....
Document: Seasonality: time series -wavelet and Fourier analysis -Wavelet analysis permitted identifying a strong tendency for RSV annual cycles in all regions of the country; in addition one can suspect a lower second wave peak, especially in the early years of the series. It is unstable and not statistical significant, but present in Figs 1-3. This evidence may indicate a biannual (semiannual) periodicity, that is, six months after the main peak. This second peak is more evident in the North and Midwest regions in specific years (Fig. 1 ). As shown in Fig. 1 , there is a seasonal pattern evidenced by the wavelets. Any irregularity may be due to the small number of monthly samples.
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