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Why Omicron Was First Found in San Francisco

As soon as the first U.S. case of the Omicron variant of the coronavirus was reported in San Francisco, California officials began sounding the same message: Don’t panic.

“We are not surprised by this. This was predictable. This was predicted,” Gov. Gavin Newsom said in a news conference yesterday. “We should assume that it’s in other states as well.”

Omicron, a highly mutated version of the coronavirus that was first identified in South Africa, has been detected in more than 25 countries. But that still raises the question: If Omicron is spreading far and wide, why was the first U.S. case discovered in San Francisco?

As with most things, there’s an element of randomness here. If we think back to the spring of 2020, an early coronavirus outbreak at a Seattle nursing home signaled terrible luck — not that the city was the most infected in the nation.

It’s most likely a similar situation in San Francisco. The city is one of the most vaccinated places in the country — with 77 percent of residents fully immunized against Covid-19 — so it’s not particularly susceptible to coronavirus outbreaks.

But its popularity with global travelers does make it vulnerable to contagion imported from elsewhere.

On Tuesday, before the Bay Area case was identified, Dr. Rochelle Walensky, head of the Centers for Disease Control and Prevention, announced expanded Omicron screening at San Francisco International Airport, calling it one “of the busiest international airports in the country.”

Indeed, the San Franciscan infected with Omicron had returned from a trip to South Africa on Nov. 22. The patient’s symptoms began three days later.

That set off a rapid chain of events. The infected person, who is between the ages of 18 and 49, was tested on Sunday and got a positive result on Monday. In less than 24 hours, scientists at the University of California, San Francisco, had determined that it was Omicron.

Newsom chalked up the diagnosis to California having “the most robust testing program and protocols in the nation” as well as strong collaborations with major academic centers such as U.C.S.F.

Compared with the nation overall, California does perform genetic sequencing on a higher percentage of coronavirus samples — roughly one in five. (Since August, those tests have shown that at least 98 percent of Californians with Covid-19 have been infected with the Delta variant.)

Dr. Mark Ghaly, the state’s secretary of health and human services, said that the San Francisco patient was self-isolating and had mild symptoms that were improving, and that no close contacts had tested positive — what he called “a testimony to the importance of vaccinations.” The patient had received two doses of the Moderna vaccine but no booster.

Though scientists must still determine how well the shots will ultimately protect against Omicron, many experts expect they will ward off severe illness and death, if not infections altogether. Answers about whether Omicron is more contagious or deadly remain elusive.

In light of Omicron’s arrival in the United States, Dr. Anthony S. Fauci, the president’s top medical adviser, said that Americans should not wait for pharmaceutical companies to develop a booster shot designed for the new variant and that the available doses would provide extra protection.

“Get boosted now,” he said. “We may not need a variant-specific boost.”

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Today’s travel tip comes from Barry Naiditch:

“A four- or five-day trip from San Diego to the Central Coast is a favorite for this household. The beaches are clean and uncrowded, with wine tasting venues nearby.”

Tell us about your favorite places to visit in California. Email your suggestions to CAtoday@nytimes.com. We’ll be sharing more in upcoming editions of the newsletter.

Has your child been vaccinated against Covid-19?

Share stories of your children receiving their coronavirus shots and how it has affected your holiday plans. Please include your child’s name, age and city of residence — and even a photograph, if you’d like.

Email me at CAtoday@nytimes.com and your submission may be included in a future newsletter.

“The Hare With Amber Eyes.” “The Dangerous Book for Boys.” “Heart of Darkness.”

Those books and others are prized possessions for Tiffany Bey, but she doesn’t have a safe place to store them. So Bey, who lives in a tent in downtown Los Angeles, signed up for the Bin, a storage facility for homeless people in the city.

Each bin is a repurposed 60-gallon trash can where individuals can keep whatever they treasure most.

“I’m happy I found it because it really helped me out when I needed it,” she told Spectrum News 1 as she unloaded her books. “I store the items that are most valuable to me in here.”

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