1.   And a new vaccine strain from Johannesburg appeared to stop influenza B strains that were becoming resistant to the current vaccine.

2.   And still other adults will queue up for yearly vaccinations tailored to the latest influenza strain.

3.   But the overall results were considered a failure because the vaccine-Adjumer combination did worse with the third influenza strain.

4.   Flu watchers worldwide are forever on the lookout for substantial shifts in influenza strains, which could devastate populations with no immunity to a new strain.

5.   In seeking such clues, scientists at the centers are studying the temperatures at which the influenza strains replicate most efficiently.

6.   No one knows why influenza strains move as they do.

7.   The vaccine with Adjumer provided positive immune responses to two of the three influenza strains, according to Ward.

8.   Unlike influenza strains, which circle the globe annually, different types of polio tend to circulate in specific regions.

9.   What this influenza strain is doing is unsettling to scientists.

10.   People need a flu shot annually because different influenza virus strains circle the globe each year.