When you design a vaccine, you design it to produce antibodies that are very specific to the antigen you want to attack. When you test it, you use candidates that will likely generate high levels of antibody and with a very high potency for neutralization. Because you are engineering it, you are developing it, so you can choose what type of antibody response you want to get from that vaccine.
When these researchers looked at the overall duration of the immune responses, it's as I was saying before, the immune response is not equal from one person to the other. Some of them have a very weak immune response. We don't decide what kind of immune response we're going to have. It depends on our genetics and all kinds of virus-host interactions. But, when you design a vaccine, this is what you're looking for and you're engineering it to produce long-lasting....
If you're not successful in producing a vaccine that has a very durable response, you can also boost it—give booster doses. Because it is a virus that does not integrate our host's cells, even if you need to give two or three boosts for the vaccine to be efficacious in the population, it can still be done in a one-year or two-year time frame and then be successful in eradicating the virus.