The order was issued in UCLA and Cal State LA for students and employees exposed to a confirmed case of measles who can not prove they have been vaccinated against the highly contagious disease.
These students and university staff, numbering more than 100, they are ordered to stay at home, avoid contact with other people, and notify civil servants if they develop symptoms.
"Both universities support the execution of quarantine orders and determine how best to support students who have to be quarantined and who live in college," said the Los Angeles County Public Health Department.
US Centers for Disease Control and Prevention confirmed on Wednesday the important event, stating that the agency had counted 695 cases in 22 countries this year.
Los Angeles health officials say the measures at both universities are being implemented "to raise awareness amongst pupils, teachers and staff about the risks of measles following potential exposure to measles".
"The quarantine for measles may be up to 21 days from the date of the last exposure, where the exposed person is no longer at risk of developing the disease and spreading measles to other people," the statement said.
Measles is a highly contagious disease caused by a virus that can spread in the air when an infected person coughs or sneezes or if someone comes into direct contact or shares microbes by touching the same objects or surfaces. Symptoms of measles may include fever, cough, runny nose, eye watery, and rash of red spots.
Measles can remain in the air for up to two hours after a sick person coughs or sneezes and can remain on the surface for many hours, making college campus particularly susceptible to spreading the disease due to the large number of people entering and leaving buildings.
In a letter to students and lecturers, UCLA Chancellor Gene Blok said the university was told on Monday that a student had a measles infection. The student attended classes in Franz Hall and Boelter Hall three days – April 2, 4 and 9 – while he was infected, said Blok.
"Having learned about this incident, UCLA immediately identified and notified more than 500 students, teachers and staff with whom the student may have come into contact or who would otherwise be at risk," Bloch said. "They were provided with detailed information on treatment and prevention."
Most people have been cleansed, the Chancellor said, "but we still expect medical data from 119 students and 8 lecturers to determine if they are immune to measles."
"We expect the patients to be quarantined for approximately 24 to 48 hours until their evidence of immunity is established," said Bloch. "Few may have to be quarantined for up to seven days." We are staged for those living in the university to be cared for in Los Angeles while under quarantine. "
In the Los Angeles state of California, school officials said there may have been exposure to measles in the North Library on April 11, between 11:00 and 15:00.
Library staff, including student workers, "are sent home under quarantine orders and ordered to stay at home and avoid as far as possible contacting other people," the university said.
The university did not say how many people were affected by the quarantine.
"The Department of Public Health has determined that currently there is no known risk associated with measles in the library," the university said.
Meanwhile public health officials urged Californians to make sure they were vaccinated against measles before traveling, especially in international locations.
The number of measles cases in California has increased more than twice in the last week, from 15 to 38, the California Department of Public Health said. Last year, there were a total of 11 cases.
Of 2019 cases, 14 cases were international travelers, 22 were due to people traveling to California, and two cases were from an unknown source, the agency said.
Health officials also said that a passenger who flew from Los Angeles International Airport on 18 April was confirmed in a case of measles, the fourth such case at the airport.
"Vaccination is the only way to ensure that you and your family members do not get measles," said Dr. Karen Smith, director of the Department of Public Health in California. "Many countries are currently experiencing widespread measles activity, making sure you and your family are fully vaccinated before traveling abroad."