Here's an insight into what it takes to become a pandemic, and what will define whether the 2019-nCov outbreak is at risk of becoming the next global health disaster.
The World Health Organization has concerns that conditions in the violence-plagued region are conducive to the outbreak of diseases.
Samoa's island population of just 200,000 has been gripped by the highly infectious disease that has killed 81 people, most of them babies and young children, and infected more than 5,600 people.
The immunisation, carried out under emergency powers, is a desperate bid to halt measles infection rates that have been inexorably rising since mid-October, with most of the victims young children.
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.
Growing scepticism of vaccines in Europe, especially in countries like France should be a cause for concern.
Research shows for the first time how measles – one of the world's most contagious diseases – erases the body's memory of previous pathogens, effectively wiping its immunity memory.
Globally, nearly three times as many measles cases were reported from January to July this year than in the same period in 2018, the WHO said.
Social media companies have struggled to combat fake news of all sorts, from political propaganda to bogus warnings about vaccines such as MMR for measles, mumps, and rubella.
Mexico's Ministry of Health has issued a travel alert to the United States after a Mexican was infected with measles while visiting New York.
By Friday afternoon, two days after Los Angeles County ordered the precautions, about 325 of those affected had been cleared to return after proving their immunity to the disease, through either medical records or tests, health officials said.
A total of 555 cases of measles have been recorded in the United States since January 1 with an Orthodox Jewish community in New York City being hardest hit who were infected by visitors from Israel, where a measles outbreak began a year ago.
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