Attacks include an incident 4 days ago involving burial workers in Forecariah.
Although response efforts have curbed exponential growth, getting to zero will be a 'long and bumpy road.'
Outbreak countries report 100 more confirmed cases but have made great progress placing orphans, UNICEF says.
The fund is expected to provide $100 million for the three Ebola-stricken nations.
Officials say $1 billion is needed now, ahead of the upcoming rainy season.
For the first time this year, all 3 nations see an increase in cases, while the CDC reports on a December lab incident.
A clinical trial of 2 Ebola vaccine candidates was launched today near Liberia's capital, but falling case numbers may pose problems.
UNMEER head calls the situation "perilous," because the disease is still present in 25 of 66 districts in the three outbreak nations.
The international relief group calls for a multimillion-dollar "Marshall Plan" to aid outbreak nations as cases in the region top 22,000.
The proposals aim to improve the agency's ability to handle global health emergencies.
