1) Hi I am a Singaporean female, 21 years of age. I just got myself a typhoid vaccination today, but I forgot that I took one in 2012. I know it lasts 3 years, so should I be concerned? 2) Also, is it necessary for me to take doxycycline capsules? I would be travelling to Vietnam in May 2014, and I was prescribe those tablets. I googled and found that there are many side effects from taking doxycycline, so I am rather hesitant. 3) The GP I consulted adviced me to take more food items with pro-biotics like yoghurt and yakult to prevent me from getting thrush as a side effect from taking doxycycline. However, from googling, I was adviced not to take diary products. What should I do? And can I drink soya milk?