original_query: What is the significance of opt-out diagnostic testing for pregnant women in Mozambique?
query: What is the significance of opt-out HIV diagnostic testing for pregnant women in Mozambique?
answer: Opt-out HIV testing for pregnant women in Mozambique, introduced in 2006, significantly aids in the prevention of mother-to-child transmission (PMTCT) of HIV.  It allows for early detection and treatment of HIV in pregnant women, reducing the risk of passing the virus to their newborns.