Not worth the gamble, but the odds are for them to be safe in Iran.  It is all in the odds.  One percent of pregnant women with the Zika virus will have their newborn affected detrimentally.  Of the thousands of zika cases of pregnant women in Mexico, as reported by Bajazika virus, it will be a remote case for one's child to be affected there.  Would that allow myself or my wife to travel to Cancun amidst the over 350 cases of Zika in pregnant women in that state;  or the possibility of myself being affected and carry the virus to Canada wth redistribution, with a 6 month timeline.  Odds are no harm done for the Canadian traveller to that Mexican State, with regard to Zika.   But why would I gamble?   Sending the team to Iran will be a much greater gamble.