Hi Ewan,

In Rubella virus it was shown that in natural infection, the initial acute immune response was higher in males against the potent neutralizing domain. Whereas the females retained higher overall mean response compared to males in convalescent phase.

But, in vaccination with live-attenuated virus, there was initially a difference in immune response (in early weeks) but then after re-immunization, no difference was observed in males or females. 

Hope this will be helpful.

Thank you Lav