Many commentators have commented on this, so I will note this simply for posterity:

# curl http://cdc.gov/swineflu/
<html lang="EN">
<title>This Page Has Moved</title>
<script language="JavaScript1.1">
<meta name="robots" content="noindex">
<meta http-equiv="refresh" content="0;URL=/h1n1flu/">
<p>This page is found at <a href="https://ruk.ca/h1n1flu/">http://www.cdc.gov/h1n1flu/</a>.</p>

Here in Prince Edward Island they’ve decided to go the “more complicated still” route, with the official name now “Influenza A(H1N1) (Human Swine Influenza)” (which, to my ears, sounds like a flu that only contemptible people get).