The incident took place in Seoul, South Korea, where masks have been required on public transport since May.
Maria Van Kerkhove, the WHO's technical lead on the COVID-19 pandemic, also said "it's possible" to catch coronavirus twice.
Abe is Japan's longest serving leader.
The incident comes after a man in Hong Kong tested positive for a second time, marking the first documented case of COVID-19 reinfection.
The FDA warned that ingesting alcohol-based hand sanitizer products can be deadly, especially for young children.
Nearly 20 people from Massachusetts tested positive for the virus after attending the Rhode Island event.
State has suspended testing as thousands of people evacuate their homes.
The team hopes the work brings us a step closer to new treatments.
Researchers from Britain's defense laboratory showed the product can kill the strain that causes COVID-19.
Nearly 40 other students in Oklahoma were also quarantined last week after a middle school volleyball player tested positive.
Study comes as China and Russia push ahead with their own vaccination campaigns.
Authorities said the two patients left Beijing Ditan Hospital on Tuesday.
The air quality in the Bay Area is expected to be at a moderate level from Thursday.
Cases have been confirmed in the Netherlands and Belgium after Hong Kong reported a man in his 30s had been infected with SARS-CoV-2 for a second time.
Howard Koh, who was assistant secretary for health under President Barack Obama, told Newsweek public trust needs to be at the "highest possible standard" for any future COVID-19 vaccine.
Local health officials have issued warnings that visitors must wear face masks and practice social distancing at the resort.
The doctor said he hadn't seen anything like it in his 30 year career.
Experts questioned claims by the administration that the treatment reduces mortality by 35 percent in some COVID-19 patients.
The weekly totals of new cases in Spain, Italy and France have increased for several consecutive weeks.
Average daily new cases have been on an upward trend in several states in the Midwest, including Iowa, Missouri, Kansas and Nebraska.
The incident happened at a county dubbed the shark attack capital of the world.