Swine flu: warning signs that someone is going sour

Category: CDC • Clinical • Infectious disease • Influenza treatment • Swine flu

Since I talk a lot about flu in my real life as well as on the blog, I get questions from moms and care givers who wonder when they should start to get worried about a sick child or relative. It's context dependent, of course. The same symptoms that would be shrugged off at any other time take on a different meaning during a flu outbreak, especially when everyone seems uncertain about what is happening or what might happen. There's nothing irrational about this. Infection with influenza virus is always potentially serious and when the young and healthy are in the cross-hairs even more so. Many other viruses can cause the same initial symptoms ("flu-like symptoms"), outside of flu outbreaks the likelihood those symptoms represent influenza infections is small. When flu is circulating in the community, however, the likelihood that the very same symptoms are from an influenza infection goes way up (the reasons can be found via an elementary application of Bayes Theorem in probability theory). So knowing when things are going sour is more important.