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Publisher's Note: Correction and clarification

Posted by mlipsitch on 08 Jan 2010 at 18:50 GMT

Cases of novel influenza A/H1N1 among travelers to Mexico from three countries as of May 6, 2009 (Canada) or May 8, 2009 (US, UK, Spain) and associated estimates.

The figures in the last two lines (indicated by *) correspond to calculations based on only one case per possible cluster, and near border cases removed (as in line 3 of the table).

Also, the total travel volume for April (last column, line 4), should be 689,250, which is the total of the preceding columns and matches the text. This is an authors' error.

No competing interests declared.