Recent measles outbreaks in 2015 highlights which aspects of the spread of disease?

The aspects of the spread of a disease highlight:

Syntoms usually developed after 18 days of the exposure to the virus. The syntoms: runny nose, red eyes, mild to moderate fiver, cough. All this shows before the rush, which appears days later. The virus can be widley spread in places were a lot of people are together. Since the syntomos are presented after 18 days people do not always know they are sick and this is dangearous because it is very contagious.

Explanation:

In 2015 there was a spread of measles in Dinsneyland Park, were neraly 180 people were infected with the virus. It was the first case since 1997. Most cases of people that were infected with the virus was link to the exposure of Disneyland park. The spread of this virus is very fast and since the syntoms do not show up promptly, people can still infect other without knowing.