Keyword | CPC | PCC | Volume | Score |
---|---|---|---|---|
when was the spanish flu vaccine created | 1.49 | 0.3 | 2967 | 6 |
how was the spanish flu vaccine created | 1.59 | 0.9 | 3308 | 38 |
was there a spanish flu vaccine | 0.74 | 0.2 | 3954 | 56 |
when was the flu vaccine created | 0.63 | 0.4 | 6646 | 10 |
when was the influenza vaccine created | 1.89 | 0.5 | 2769 | 72 |
what year was the flu vaccine created | 0.69 | 0.2 | 4397 | 41 |
when was the flu vaccine invented | 1.96 | 0.2 | 1785 | 72 |
spanish flu vaccine development | 1.94 | 0.5 | 2744 | 35 |
vaccine for spanish flu in 1918 | 1.62 | 0.1 | 4684 | 80 |
when was the influenza vaccine invented | 1.95 | 0.3 | 700 | 70 |
when did the spanish flu started | 1.8 | 0.7 | 7329 | 75 |
spanish flu vaccines 1918 | 1.7 | 0.3 | 7230 | 38 |
spanish flu vaccine information | 1.01 | 0.6 | 7742 | 24 |
history of the flu vaccine | 1.42 | 0.3 | 371 | 64 |
what year did the spanish flu start | 1.55 | 0.1 | 1897 | 71 |