血清倍比稀释，elisa测OD值后，抗体滴度怎么计算

For each serum sample, the dilution with an OD450/630 between

0.2 and 3.0 was used to calculate the antibody titer, and the antibody titers were calculated using the following formula: dilution fold * OD450/630/0.1.文献里的这个公式dilution fold * OD450/630/0.1.是啥意思