Abstract:
:From 1992 to 1999, we analyzed >2.5 million cases of influenzalike illness (ILI). Nationwide influenza epidemics generally lasted 3-4 months in winter. Kriging analysis, which illustrates geographic movement, showed that the starting areas of peak ILI activity were mostly found in western Japan. Two spreading patterns, monotonous and multitonous, were observed. Monotonous patterns in two seasons featured peak ILI activity that covered all of Japan within 3 to 5 weeks in larger epidemics with new antigenic variants of A/H3N2. Multitonous patterns, observed in the other five seasons, featured peak ILI activity within 12 to 15 weeks in small epidemics without new variants. Applying the kriging method allowed better visualization and understanding of spatiotemporal trends in seasonal ILI activity. This method will likely be an important tool for future influenza surveillance in Japan.
journal_name
Emerg Infect Disjournal_title
Emerging infectious diseasesauthors
Sakai T,Suzuki H,Sasaki A,Saito R,Tanabe N,Taniguchi Kdoi
10.3201/eid1010.040147subject
Has Abstractpub_date
2004-10-01 00:00:00pages
1822-6issue
10eissn
1080-6040issn
1080-6059journal_volume
10pub_type
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