Remember the seasonal flu?
The last typical season was the winter of 2008-09. The pattern was upended by an out-of-season pandemic flu the following spring and fall, and hardly any flu at all last winter.
Now the best educated guess by public-health experts is that influenza will next appear in a more-or-less normal season that contains several strains, including the so-called swine flu.
And vaccine is starting to arrive.
Several retail drugstore chains are already offering vaccine or plan to start soon. (For locations and eligibility, go to http://go.philly.com/flu).
Most county health departments in the Philadelphia region have begun receiving vaccine, and all plan clinics in the fall. Shipments to private practices are harder to measure. But all five manufacturers reported two to three weeks ago that they had already started delivering what is anticipated to be a record 150 million to 180 million doses, vaccine expert William Schaffner of Vanderbilt University School of Medicine said Tuesday.