Errata: Vol. 55, No. 40
On page 1121, in the Table, the date of vaccination for patient 2 should read, "March 22," and for patient 3, "March 24."
On page 1123, the third footnote beneath the Figure should read, "§ Cluster at 9--15 days statistically significant (p = 0.012; temporal scan statistics )."
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