Those mostly at risk are people who are unvaccinated, people with compromised immune systems and people who travel internationally.
WHO named vaccine hesitancy as one of the 10 biggest threats to global health in 2019 in a report last January.
The number is just shy of the record 667 cases reported in all of 2014 - fourteen years after the disease was officially eliminated in the United States.
Caplan also said that when the country is facing health crises like the opioid epidemic, it is "tragic" to spend money on preventable diseases like the measles.
Health officials gave each of the locations the all-clear but issued a stern warning to others not to go out in public without first calling a hospital or physician to prevent spreading the disease. Many adults born before 1989 have not had the recommended two rounds of measles vaccination. The vaccine is 97 percent effective against the disease.
The case of measles was confirmed last week for a senior who had been travelling in Southeast Asia, which is an atypical occurrence, Cholewa said. In Butte County, health workers are scrambling to manage both the measles outbreak and the fallout from November's massive wildfire, the Los Angeles Times reported.
"It is especially important to check your vaccinations if planning overseas travel". The majority of the cases were unvaccinated.
Complications, which are more likely in patients younger than 5 and older than 20, can include ear infections with permanent hearing loss, diarrhea, pneumonia and swelling of the brain.
Infected people can infect those around them before they have symptoms and know they are infected.
Almost 110,000 deaths were attributed to measles n 2017 and, according to World Health Organization, complications from the disease even in high-income countries can result in hospitalization in up to a quarter of cases.
"The unvarnished truth is that these diagnoses represent the most significant spike in incidences of measles in the United States in many years and that the Williamsburg section of Brooklyn is at its epicenter", Judge Lawrence Knipel wrote in his ruling. Symptoms usually appear 10-12 days after exposure but may appear as early as seven days and as late as 21 days after exposure.
These five cases are the first cases of measles confirmed by Public Health among Los Angeles County residents and the first cases of transmission within LA County in 2019.
He also backs people facing fines who refuse to vaccinate their children and cause an outbreak, as well as putting in place a requirement for immigrants to provide vaccination records. You might experience a high fever, cough, runny nose and/or a rash.
"This is often but not always followed a few days later by a blotchy, red rash".