Havshield is an inactivated vaccine. So 2 doses (6 mnths apart, minimum age 12 mnths) are required
Biovac A is a live, attenuated vaccine. It's immunity is better. So only one dose required.
Next Steps
Both above provide long term protection
Health Tips
Drawback of live vaccine (eg Biovac A) is that it can't be given to children / adults with low immunity or if a family member has an immune deficiency