Lets clear up some things..
herd immunity isnt tat.. its where u hav immunity because a high proportion of a community has immunisation and hence no reservoirs to be 'stored' in..
but in humans its really only true of smallpox and polio... where ure more likely to get them from certain forms of the vaccine than a 'wild' infection
actualli being from asia is a risk factor for Hep B.. due to high numbers of ppl infected in asia ..its endemic.. with some ppl they got it and its not active atm.. so they show no symptoms (chronic Hepatitis B infection).. and may not show any till they are in their 40-60's or if their immune system drops.. but they are infectious.. very infectious.. 10000% that of HIV infectivity
normally they do a test to see what you have immunity to before they shot u up.. or its a real waste of the Hep B shots.. its available as a dual vaccine now.. with Hep A i think?..
hahah@ bubble tea needles.. (14 gauge reminds me of it.. but mabbe its cos i hate needles..)
interesting tale: i recall there was research done into US medical practitioners immunity .. and lots of them were immune/exposed to certain virus that they were never aware of... lik not a full blown sickness ("subclinical").. just from patient and hospital contact