| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| why does active immunity last longer | 0.87 | 0.6 | 7352 | 57 |
| how long does active immunity last | 0.88 | 0.8 | 9817 | 62 |
| how long does immunity last | 1.69 | 0.8 | 2262 | 15 |
| why does adaptive immunity take so long | 0.71 | 0.2 | 9716 | 57 |
| why does passive immunity not last long | 1.16 | 0.6 | 4619 | 76 |
| natural immunity longer lasting | 0.56 | 0.6 | 7216 | 27 |
| what results in active immunity | 0.52 | 1 | 4419 | 9 |
| how long does natural immunity last | 1.36 | 0.1 | 3831 | 44 |
| when does active immunity occur | 0.73 | 0.5 | 8455 | 40 |
| why does immunity decrease with age | 1.12 | 0.4 | 7171 | 7 |
| is active immunity temporary | 0.62 | 0.9 | 4816 | 48 |
| does natural immunity last forever | 1.07 | 0.7 | 1253 | 79 |
| how does active immunity work | 1.97 | 0.6 | 9954 | 90 |
| what does active immunity give you | 1.19 | 0.6 | 9978 | 82 |
| long term immunity occurs when | 0.42 | 0.5 | 7810 | 43 |
| how long does the immune response last | 1.81 | 0.7 | 7002 | 74 |
| immunity you get over a lifetime | 1.7 | 0.4 | 8277 | 52 |
| long-term immunity is made possible by | 0.68 | 0.3 | 3535 | 82 |
| how does age affect immune system | 0.23 | 0.4 | 3157 | 4 |
| how long are you immune | 1.22 | 0.8 | 4960 | 92 |
