Dozens of high school students in California contracted COVID-19 after attending their prom.
San Mateo High School held the party on April 9 at the Asian Art Museum in San Francisco, about 18 miles away. Following the event, however, 90 out of the nearly 600 students who attended tested positive for the virus.
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“I was not very sick. I had a sore throat for a couple of days, like two, and then congestion,” junior Parker Del Balso, one of the 90 to contract COVID, told local affiliate ABC 7.
According to San Mateo Union High School District Superintendent Kevin Skelly, all of the cases were mild.
The outbreak comes as several other superspreader events have been reported, mostly recently this month’s Gridiron Club dinner in Washington, D.C., that saw several high-profile politicians test positive for the virus including House Speaker Nancy Pelosi, Attorney General Merrick Garland and Secretary of Commerce Gina Raimondo.
Google Maps Street ViewSan Mateo High School in San Mateo, Calif., is seen here in November 2020 on Google Maps Street View.
However, the cases were all reported to be either asymptomatic or mild, and no one required hospital care.
Experts said these outbreaks are a sign that BA.2 — a highly infectious subvariant of the original omicron variant and the predominant variant in the U.S — is not having a major impact on hospitalizations or deaths.
“These events, either among students or politicians, we are seeing signs of superspreader events,” said Dr. John Brownstein, an epidemiologist at Boston Children’s Hospital and an ABC News contributor. “But they’re not severe because of widespread vaccinations and people are overall protected from severe illness and death.”
Masks were optional at the event but “strongly recommended,” the district told ABC News in a statement. However, according to guidance from the Department of Public Health in San Francisco, where the prom was held, masking is only required in high-risk settings such as health care facilities and homeless shelters.
In other settings, masking is only recommended based on individual risk tolerance, where there is high levels of community spread and if someone is at high risk of severe illness.
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Despite the outbreak, school leaders and students said having the prom was worth it to provide a sense of normalcy during the pandemic.
“This has been a really hard year for kids, and we need to keep having as many activities as we can,” Skelly said.
Del Baso, the junior student, agreed, telling the local station, “Overall, I think it was worth it. It was a great, fun time.”
Skelly told ABC 7 that other schools in the district will be adding more mitigation measures to their proms so they don’t experience similar outbreaks.
“We’re going to be more careful about activities,” he said. “We’re going to test more students beforehand to make sure they’re not going into the dance COVID positive.”
Dr. Ali Mokdad, an epidemiologist with the University of Washington’s Institute for Health Metrics and Evaluation in Seattle, said the timing of the test before such events is very important.
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“If you are doing a rapid PCR test and the event happens within two to three hours, that’s a good idea,” he told ABC News. “The timing and quality of the test will give you a good sense of security.”
He continued: “But if you get tested 48 hours before the event, you could catch the virus within that time and spread it.”
In a statement to ABC News, Skelly said the district “cares deeply about the health and safety of members of our community and creating opportunities for students to enjoy and benefit from student activities such as performing arts, athletics, and senior rites of passage. We have been and will continue to be driven by these values.”
The Asian Art Museum did not immediately return ABC News’ request for comment.
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