Soo..........after several months of obtaining various angles on this........
1) Zika originating in Africa, but not
until last year, any association to microcephaly
2) Vaccines given to women around time of conception in Northeast Brazil
3) Followup health department analysis, from some impacted Latin American countries, saying some of the data was questionable
4) Spraying of a particular pesticide in impacted areas being considered
5) The release of genetically-modified mosquitoes in Latin America and Caribbean the last 2 years
I have still have no clue what the source of this really is and how true the data is

...........
so now that there are supposedly 157 pregnant women in the U.S. with Zika virus as of May 2016....I'm going to make a educated guess on the outcome of these pregnacies. If the majority of women have not visited Latin America in past 6 months I'm going to morbidly suggest very few babies will come down with microcephaly if any.

.....Regardless of results we gone get a idea of what may be contributing to microcephaly........

.
CDC says 157 pregnant women in U.S. test positive for Zika
CDC says 157 pregnant women in U.S. test positive for Zika
Friday, 20 May 2016 | 10:00 AM ET
May 20 (Reuters) - Some 157 pregnant women in the United States and another 122 in U.S. territories have tested positive for infection with the Zika virus, the U.S. Centers for Disease Control and Prevention said on Friday.
It was the first time the agency had disclosed the number of Zika-infected pregnant women in the U.S. and its territories.
U.S. health officials have previously said that the virus, which is spread through mosquitos and sexual contact, can cause microcephaly, a birth defect marked by small head size that can lead to severe developmental problems in babies.