The update raised the number of deaths in mainland China to 1,886 and the total confirmed cases to 72,436.
Although viruses are small enough to get through a typical strap-on medical mask, masks can block large droplets that viruses can latch onto.
Out of 50 US service members diagnosed with traumatic brain injuries, 31 were treated in Iraq and returned to duty, says Pentagon official
The researchers were able to replicate the development of the disease in mice, and showcased the disease's ability to transfer between different species.
In all, 53 people have died since late October. Most of those who have died have been babies and young infants, including 23 babies aged under 12 months and another 25 children aged between 1 and 4 years.
Officials declared a state of emergency and said a compulsory immunisation programme was making progress, with more than 17,000 people vaccinated in the past five days.
Dengue fever is a mosquito-borne disease. But new research shows that the bacteria Wolbachia can turn mosquitoes against themselves.
The vaccine is supposed to complement the Merck vaccine which has been administered to 250,000 people since the 2018 Ebola outbreak and will be administered to an additional 50,000.
Growing scepticism of vaccines in Europe, especially in countries like France should be a cause for concern.
The motive for the murder in the town of Lwemba in the troubled Ituri region was unknown, but it came as health authorities were set to introduce a new vaccine against the disease in unaffected areas.
Pakistan, Afghanistan and Nigeria are the only countries in the world, where polio is endemic. And in contrast to recent years of gradual improvement, this year there have been at least 72 cases of polio in Pakistan after only eight in 2018.
The mosquito-borne viral infection, that is found in tropical countries worldwide, kills dozens of people every year in Pakistan.
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