The World Health Organization declared the Zika outbreak, suspected of causing thousands of birth defects in Brazil, an international health emergency on Feb. 1.
Most of the cases were identified in the southern Mexican states of Chiapas and Oaxaca.
Pope Francis' remarks suggested artificial contraception can be used by women threatened by the Zika virus.
Brazil said it has confirmed more than 500 cases.
The crisis is putting pressure on Church doctrine that bans all forms of contraception, and has even stoked a debate over abortion in many conservative Latin American nations.
The virus has been linked to microcephaly, a condition in newborns marked by abnormally small heads and brains that have not developed properly.
Some “babymooners” - parents-to-be taking last-hurrah vacations - have backed out of trips and changed itineraries.
Mexico has so far confirmed 34 cases of Zika, up from 18 last week. It has not yet detected a case in a pregnant woman.
The county department said on Twitter that the person was infected through sexual contact with someone who had traveled to Venezuela.
The mosquito-borne virus is linked to birth defects in the Americas.