In an unprecedented attempt to contain the disease, the Chinese government has placed the hardest-hit cities — home to more than 60 million — under lockdown. Many countries including India, Australia, US have placed travel restrictions to China including visa restrictions as many air carriers have reduced or suspended routes to and from the country. Health and other concerned ministries in nations around the world have stepped up their efforts to curb the spread of the deadly virus. (Photo | NIAID - RML)