Vaccination with Ixiaro against Japanese encephalitis?

Hey!

I asked this question to a couple of vaccination clinics in my country and I got two different answers. So I am comming here to try to get some understanding.

I am male, 28 yo, and in good health.

I took my first dose of Ixiaro in 2012 , but I never took the required second dose. Now I need to get vaccinated again, and my question is: Do I need to restart the vaccination and take two doses approx 1 month apart, or can I continue what I started in 2012 and take a single dose?

The replies I have gotten (from registered doctors in my country) is either "since you didn't complete your first vaccination within 11 months you have to restart" or "Because of the first dose you have immune memory that only needs to be reminded, so a single dose is enough"

So, what would you say? I will probably go with 'better safe than sorry' but I am curious of why I get two different answers.