Distribution and risk factors of 2009 pandemic influenza A (H1N1) in mainland China.

The density of medical facilities could have influenced pandemic influenza patient reporting, and this effect seemed more important for the reporting of local transmission (a highly significant positive association) than for reporting of the invasion (borderline significance).

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The significant effect of being intersected by railways disappeared, and the density of medical facilities showed borderline significance after correction for other factors in multivariate analysis, whereas being intersected by national highways and freeways and proximity to airports and higher population density remained as significant factors, all showing a positive association ( Table 1 ).

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