Your post includes several questions.<\/p>\n
Firstly, your sister is at risk of catching HIV is she continues to have unprotected sex with her HIV-positive partner.<\/p>\n
It is also possible that she may already have caught HIV, as other sexually transmitted infections like herpes increase this risk. It is important that she speaks to a doctor about her own health, if she has not already done this.<\/p>\n
HIV and chlamydia are sexually transmitted infections, and are not spread by casual contact, so your baby is not at risk.<\/p>\n
Herpes is also generally a sexually transmitted infection, but can sometimes be passed by casual contact. For example if your sister has a cold sore which she touches and then touches the baby. Brushing her teeth will make no difference but washing her hands will stop this risk.<\/p>\n
Information on transmission and prevention are included on these links, but there is plenty of other information about this on the internet.<\/p>\n
Try these first:<\/p>\n
Information on chlamydia from NHS website<\/a><\/p>\n