Neutralizing Antibody Quantities
This chart shows neutralizing antibody quantities at their peak one month after the last dose. Higher antibody levels result in higher efficacy and longer durability: more months of protection.
Vaccine |
Levels of antibodies |
1. Novavax |
1400 |
2. Moderna |
1300 |
3. Pfizer |
500 |
4. J & J |
450 |
5. AstraZeneca |
300 |
6. Sinovac (China) |
- |
Declines in Antibody Quantities
Antibodies have a half-life of about 1 month. This means that each month, the quantity of antibodies drops in half. In other words, by 50%. The lower the quantity drops, the lower the efficacy.
Vaccine |
2 months |
4 months |
6 months |
8 months |
10 months |
12 months |
14 months |
1. Novavax |
700 |
350 | 175 | 87.5 | 43.8 | 21.9 | 10.9 |
2. Moderna |
650 |
325 | 162.5 | 81.3 | 40.6 | 20.3 | 10.2 |
3. Pfizer |
250 |
125 | 62.5 | 31.3 | 15.6 | 7.8 | 3.9 |
4. J & J |
225 |
112.5 | 56.3 | 28.1 | 14.1 | 7 | 3.5 |
5. AstraZeneca |
150 |
75 | 37.5 | 18.8 | 9.4 | 4.7 | 2.3 |
6. Sinovac (China) |
|