According to Paragraph 9, the effects of vaccination can be described as______.A.if you ge
According to Paragraph 9, the effects of vaccination can be described as______.
A.if you get a flu shot this year, you won't need it next year
B.the vaccine you take this year will be more effective next year
C.certain vaccines can work against all viral strains
D.you still need vaccines for new strains after being infected with one strain