Prevention of HIV Transmittance to Babies Last year, it was cause for celebration. The cause of celebration was for the results that several clinical trials of zidovudine cut the risk for mother to child transmission of human immune deficiency virus (HIV) by two thirds. Although, this year, it is the basis for new federal recommendations that all pregnant women should receive HIV testing and counseling. But, these findings have been cause of protests by several activist groups. Activists fear that conservative legislators and policy makers will use the clinical data to justify mandatory testing and treatme