Scientists saw potential in some existing drugs and showed that mosquitoes can pass the virus to their offspring.
Also, another diagnostic test received an EUA and a vaccine trial launched in Puerto Rico.
No new local cases were reported in Florida for a second day, and studies revealed more on sexual transmission risks in asymptomatic infections, GBS patterns in Puerto Rico, and early problems for infected babies.
A mouse study shows that the virus replicates in vaginal tissue for several days, while CDC officials report increasing case numbers.
In another development today, the CDC announced $6.8 million more to help with outbreak response.
The money will be spent on added staff, spraying, and community outreach.
A 2nd confirmed transmission area in Miami causes federal officials to expand their travel advisory and alert health providers of the risks.
Health officials didn't confirm news reports that Zika is transmitting in Miami Beach, but said they are probing 8 areas outside the known hot spot.
Another study pinpoints placental cells that Zika can infect, and a report from Brazil describes 2 cases linked to platelet transfusion.
No illnesses have been detected in the woman's coworkers who traveled with her to Miami or in her household contacts.
