One study found Ebola RNA more stable in blood than in urine, and an animal vaccine study showed promise.
Guinea's last patient is likely the outbreak's youngest survivor, born to a mother who died from her infection.
Also, researchers note vaccine storage limitations, and Australia eases screening.
Although officials are still tracing high-risk contacts, they reported no new cases.
Nearly 18 months after the nation reported its first case, the WHO declared it Ebola-free.
Data management problems were linked to many challenges and presented a missed research opportunity, the team reported.
The child's case is the 4th—including a death—from the same family in Forecariah district.
The US Centers for Disease Control and Prevention (CDC) yesterday stepped down its travel warnings for both Sierra Leone and Liberia, with Ebola activity continuing at zero weekly cases in both countries.
Liberia was declared free of the disease for a second time on Sep 3, and Sierra Leone will reach that mark on Nov 7 if no new cases are detected before then.
Cases in a Liberian hot spot last summer may have been triple what was reported.
The group of 28 experts continues to offer Ebola vaccine guidance and says its concept could be used in other outbreaks.
