Flares of the virus are tempering encouragement from a report saying both countries were making progress toward zero cases.
The Italian nurse's infection represents the first exported case since March.
Researchers study alternatives for quick licensure and how stepped-up strategies might help.
Immunizing pregnant women rated as best pertussis defense for infants
Experts in Geneva map out research plans, and US advisors meet about vaccine licensure.
The ongoing outbreak of cholera in Haiti that began in late 2010 has led to a dramatic rise in cases over the past 6 months, with nearly 12,000 reported already this year. The rate is only expected to soar further when the rainy season starts next month and as international aid dries up, according to an Agence France-Presse (AFP) story yesterday.
Experts say lessons learned should make the world more prepared for future emergencies.
The two nations saw only 18 cases last week from just a few hot spots.
Evidence includes a gene signature match from the woman's blood and Ebola RNA in the man's semen.
Lab-confirmed cases held steady last week, while some response statistics show reason for concern.
