Sri Lanka, April 7 -- Research to develop vaccines and treatments to fight the coronavirus has "accelerated at incredible speed," World Health Organization Director-General Dr. Tedros Adhanom Ghebreyesus said Monday.

He said more than 70 countries have joined WHO's trial to accelerate research on effective treatments and "about 20 institutions and companies are racing to develop a vaccine."

"The viral genome was mapped in early January and shared globally which enabled tests to be developed and vaccine research to start," Tedros said at a news conference at WHO headquarters in Geneva.

Dr. Mike Ryan, the WHO's executive director for emergencies program, said one trial underway will look at prophylaxis in health-care workers to see if th...