KPIX CBS Evening News with Jeff Glor March 2, 2018 01:46:00
>> glor: the f.d.a. today chose the four strains of the flu that will be targeted in the vaccine for next season. the four strains of the flu that will be targeted in the vaccine for next season. but scientists at the national institutes of health are looking far beyond next year as they try to develop a universal flu vaccine. here is our chief memory correspondent dr. jon lapook. >> reporter: it's the same problem each year: making a vaccine against a flu virus is like trying to hit a moving target. >> it changes. it mutates just enough to get it s t of the range of the vaccine. >> reporter: ...