He's not Filipino....does that matter? We are in the US.
CALM DOWN
based on statistics 10-15% of Filipinos have it... That's a whopping 10M+ people and your husband, me, and countless other Filipinos have it too. Majority of them do not know it, and usually we get to know it via accident (i knew i have it via blood donation too)
To be sure your husband, his siblings, and mom should be checked, if her siblings have it then most likely his mom have it too and they got infected when their mom gave birth to them. Also, have your kids checked too, everyone living with someone who has HBV SHOULD be vaccinated ASAP.
ALSO, HBV is a unique disease, when an adult gets exposed to it he/ she has around 90-95% chance of clearing it assuming that the person is perfectly healthy, kumbaga parang tintrangkaso lang. On the other hand, if a person is exposed during infanthood (upon birth) where the immune system is still not fully developed the stats are reversed and only 5-10% clear it, the remaining becomes Chronic carriers like your husband .
Please... Dont make it hard for your husband, he's undergoing a LOT. Just be there to support him.