PanickedSoIAteIt

Unless your fiance is a dude, it's spelled fiancee.

WHO recommends specific vaccine viruses for inclusion in influenza vaccines, but then each country makes their own decision about which viruses should be included in influenza vaccines licensed in their country. Source: https://www.cdc.gov/flu/about/season/vaccine-selection.htm

This is a website from the American Academy of Pediatrics and it a good place to start with many of these types of questions. I’ve linked to their topic on discipline. Healthy Children

In the US, most vaccines are quadrivalent and contain 2 A strains and 2 B strains