In response to a cluster of five cases of measles in northwest Harris, Galveston and Montgomery counties, the San Antonio Metropolitan Health District is trying to raise awareness of the risk and the need for up-to-date vaccinations.
"Vaccination is the most effective way to prevent measles", Denton County public health director Dr. Matt Richardson said in a written statement.
There is one additional King County measles case, who contracted the disease after traveling to Clark County.
The Centers for Disease Control and Prevention (CDC) recommends two doses of measles vaccine, one given at between 12 months and 15 months of age and one between ages 4 and 6.
All four people are under 18 years old and never received the measles vaccine.
Clark County Public Health has been regularly updating its list of locations where people may have been exposed to measles. As a highly contagious infection, measles can live in an airspace where an infected person was for up to two hours.
The vaccines include MMR, which protects against measles, mumps and rubella, and MMR-V, which also protects against the varicella-zoster virus, which causes chickenpox. It is important that you do not visit your GP without first letting him or her know that you or your child may have measles. The CDC notes that two doses of the MMR vaccine are 97 percent effective, while one dose is 93 percent effective.
The department did not release any information about the person who contracted measles, citing patient confidentiality.
The three individuals involved in the new cases were in close contact with the first Multnomah County resident who tested positive for measles January 25, according to the Oregon Health Authority.
To prevent further infections, people who are diagnosed with measles are advised to stay away from school, college, work, and public places for four days following the onset of their rash. There were 200 vaccinations given per day last year in that last week of January, and 600 per day this year.