<prompt> Possibility of veical transfer of HIV infection if no prophylaxis is given: March 2007255075100  <response>: Ans. A: 25 Probability of veical transfer of HIV infection if no prophylactic antiretroviral therapy is given to the mother during pregnancy,labor and delivery and to the newborn ranges from 15-25 in the industrialized countries and from 25-35 in the developing countries. 