Skip to main content Accessibility help
×
Home

Contents:

Information:

  • Access

Actions:

      • Send article to Kindle

        To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

        Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

        Find out more about the Kindle Personal Document Service.

        The authors reply:
        Available formats
        ×

        Send article to Dropbox

        To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

        The authors reply:
        Available formats
        ×

        Send article to Google Drive

        To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

        The authors reply:
        Available formats
        ×
Export citation

We thank Nauta [1] for providing further explanation on the need to control calendar time in TNDs. We agree that such adjustment is probably redundant in temperate climates with well-defined influenza seasons and well-defined influenza vaccination campaigns. However, we caution those researchers conducting TND studies in tropical and sub-tropical regions where there may be multiple influenza seasons. A vaccination campaign scheduled for April or September, when the Southern and Northern hemisphere vaccines are typically available, may fall before, during or even after the peak of the influenza season. When the campaign and influenza season coincide, vaccination status would not be in steady state and the need to adjust for calendar time persists.

Reference

1. Nauta, JJP. Adjusting for calendar time in a TND influenza study [Letter]. Epidemiology and Infection. doi:10.1017/S0950268816000832.