I got immunized from B before I went back to Vi39t Nam 20 years ago. I would not do it now because I do not trust needles or doctors any more. That shot is probably a good thing for people traveling to SEA who don’t stay in the tourist circuit. About 20% of Vietnamese are infected and liver cancer therefrom is a major health problem there. The problem stems from using chopsticks and dipping eating utensils for serving oneself from the common bowls of food in the middle of the spread.
My unit in RVN had to get a hepatitis shot, I do not recall the type of hepatitis it was for.
Rumor had it they used a SQUARE NEEDLE, cause it hurt like hell. I think it was called gamma globunim????
Widely hated.