"Our vaccination rates are not so low that I think we are going to be like Italy or Romania that had thousands of cases previous year but we could have a few hundred cases", Ludke said.
Clark County also reported three new exposure sites, all of which are medical facilities in Vancouver - the Vancouver Clinic Salmon Creek, the Sea Mar Medical Clinic Salmon Creek and the Legacy Salmon Creek Medical Center Emergency Department.
Washington state epidemiologist Dr. Scott Lindquist said he's seeing new cases every day.
"We know there's a link between two of the Houston-area cases, and public health is investigating to determine whether the others are linked or whether they occurred independently", Texas Department of State Health Services spokesman Chris Van Deusen said.
The number of people infected with measles in the European region during 2018 is the highest in a decade, the World Health Organization said Thursday.
The Texas cases follow dozens in Washington state, where 49 confirmed cases turned up last month. The measles vaccine is reported to be very effective; 97 percent of those who receive both vaccinations are immune.
Three cases were reported in Harris County and one case was reported in Bell, Galveston and Montgomery counties.
Health officials said it takes two doses of the MMR vaccine to protect you against Measles, Mumps and Rubella - and it will give you peace of mind if you come down with similar symptoms.
"Before the measles vaccine, we had an increase in measles, and then, when the measles vaccine was created, it started getting more and more people vaccinated", Beckham said.