Chicken pox is highly contagious ( ie. it spreads very rapidly). Post Vaccine, it takes around 6 weeks to develop full immunity, so it is better to isolate your husband till his lesions crust and no new lesions appear. Reinfection after having a infection is rare, but is possible, so do not take an chance.
Next Steps
Isolate your husband, take all precaution as you did on covid times