<prompt> Maximum exposure to HIV is seen in:Intrapartum periodBreastfeeding1st Trimester3rd Trimester  <response>: Ans: A Intrapartum period Ref: Ananthanarayan R. Paniker CKJ. Textbook of Microbiology. 8th Edition. Hyderabad: Universities Press: 2009. Pg. 575 WHO. A review of HIV transmission through breast feeding. 1998Explanation:About a third to half the number of babies horn to infected mothers are infected withTransmission of infection from mother to baby can take place before, during or after birth.HIV Virus transmission may occur to the fetus in pregnancy as early as the first trimester, but infection is more common during intrapartum period.Percentage HIV infection acquired by different routes Partially breastfed breastfedin fantsNon-breastfed infantsDuring intrauterine period2033During delivery45-5067Postpartum, by breastfeeding30-350 These rates are observed in the absence of interventions to reduce MTCT 