Before revision:  We show using Markov chain Monte Carlo methods that within a simulation estimation framework, a model fitted to sequential infection data accurately captures the timing and extent of cross-protection , and attributes such cross-protection to the correct broad immune components .
After revision:  We show using Markov chain Monte Carlo methods that within a simulation estimation framework, a model fitted to sequential infection data accurately captures the timing and extent of cross-protection . Moreover, the broad immune components .