CD40LG and Zika virus infectious disease: Changes included routinely testing tissue specimens for completed pregnancies where maternal Zika virus IgM was negative >12 weeks after possible exposure (beginning in August 2016) (3,4), and focusing testing of placental specimens from live births on those without a confirmed recent maternal Zika virus infection diagnosis (https://www.cdc.gov/zika/pdfs/placental-testing-guidance.pdf).