The number of cases has jumped 73 cases over a three-day period. State officials said their team focused on completing open investigations of measles this week.

When Texas officials first discovered measles cases this year, they were among the Mennonite population. Now, officials say cases are spreading to other communities.

Measles is considered one of the most contagious viruses in the world. It spreads through the air when an infected person coughs, sneezes or even breathes. Particles can linger in a room up to two hours after an infected person has gone.