In 2000, the measles virus was declared eliminated in the United States because of the measles vaccine, a strong vaccination program that achieves high vaccine coverage in children and a strong public health system for detecting and responding to measles cases and outbreaks, according to the Centers for Disease Control and Prevention.
"I have a 2-year-old sister and 5-year-old brother and due to their age and vaccines can prevent them from getting a disease that's preventable, I do worry about them", said Lindenberger. "90 percent of people who aren't immunized will be infected with measles, so that just speaks volumes about how contagious it is and why it's so easily spread", said Katie Nelson, Mesa County Public Health. That's similar to Washington, which allows parents to opt-out of vaccinating their children because of personal beliefs. Many have been concentrated in Washington state, where the growing number of cases has driven local demand for vaccinesand fueled debate nationwide over vaccine exemptions for non-medical reasons. Four cases in Oregon's Multnomah County and one in Seattle-King County are linked to the outbreak in Vancouver.
The law requires the government to provide free immunization to infants and children up to 5 years of age for vaccine-preventable diseases such as measles, tuberculosis diphtheria, tetanus and pertussis; poliomyelitis; mumps; Hepatitis-B; and H. Influenza type B (HIB).
He said there are people who feel the vaccine isn't effective and don't want to be a part of it.
More than 70 people - mostly children - have died nationwide since January, with a high concentration of cases in the capital, Manila, and its surrounding provinces.
Consultants consider that that is one motive why anti-vaccination hot spots like Clark County, Washington have popped up. "We may see outbreaks of measles and then you're likely to see outbreaks of diphtheria".
Since getting vaccinated is a medical procedure, in most cases teens younger than 18 need the consent of a parent, guardian, or other adult family member.
In 2000, health officials declared measles eliminated in the US, mainly through vaccinations, according to the CDC. A very few who get both two doses of the measles vaccine will still get measles if exposed to the virus, albeit a milder form of the disease. The explanation? Her mom's place, 'vaccines are risky, that is one thing we don't do, depart it alone, ' the teenager instructed NBC Information.
"For 16 years I haven't received any vaccinations", Ethan Lindenberger told KTLA sister station WJW. on Monday.
In response, Duterte has called on his health officials to increase efforts to immunise children, urging parents to avail of basic vaccines they could get free at public health centres.
Caroline Radnofsky is a London-based reporter for NBC News.