The web or network of exposed people can quickly grow from one case if steps aren't taken early to avoid further onward transmission.
Epidemics can have massive social ramifications where prohibitions are imposed on travel, socio-cultural events and schooling.
Timing is everything when it comes to making a decision about declaring a disease outbreak a public health emergency of international concern.
Hernán Cortés owed his conquest of the Aztecs to his expedition's unknown, unseen secret weapon: the smallpox virus. Disease epidemics can set the course of human history.
In January, measles returned to the Pacific Northwest, while Ebola resurged in the Congo. It would take a lot more research for scientists to be able to stop threats like these in their tracks.
Did you ever consider that human beings might have a breeding season? Birth seasonality exists – and has interesting implications for childhood disease outbreaks.
In 18 states, parents can choose to exempt their children from vaccines for nonmedical 'philosophical' or 'personal belief' reasons.
The obesity epidemic, the flu epidemic, the opioid epidemic... in the 21st century, everything seems to be an "epidemic". But what does the term actually mean?
One hundred years after a strange and devastating pandemic, researchers comb for clues in dusty libraries, church records and long- forgotten books.
In a series of experiments, we showed the high value we place on happiness is not only associated with increased levels of depression, it may actually be the underlying factor.
President Trump wants to slash global health funding at a time when more investment is needed, not less. This spending can protect Americans – as well as foreigners – from deadly diseases.
When governments delay releasing information about disease outbreaks, algorithms come to the rescue.
Emerging research suggests that preexisting immunity to dengue virus, which is endemic in South America, could make a subsequent Zika infection worse.
Emerging diseases on which the experts are keeping a close eye.
In the future, consumers in the developed world could choose to purchase products from the companies that do the most to promote global health.
A computer model suggests that while more cases of Zika can be expected in the continental U.S. outbreaks will probably be small and are not projected to spread.
What could we do if a real-life zombie disease started to spread?
The chance the someone at the Rio games will import the virus to their home country is low.