Los Angeles County has identified the first local cases of a newly emerging strain of COVID-19, the public health director said, although the numbers remain generally low and current vaccines are believed to be effective in preventing severe illness from it.
Commonly referred to as Arcturus, the strain is formally known as XBB.1.16, Barbara Ferrer told reporters in a briefing Thursday. According to the results of the most recent sequencing of select cases, the strain represented roughly 1.3% of the cases that were examined.
That’s a mere fraction of the currently dominant strain in the nation and county, known as XBB.1.5, which accounts for 71% of local cases according to the most recent testing data.
Modeling done by the U.S. Centers for Disease Control and Prevention suggests that Arcturus accounts for about 7% of cases nationwide, and nearly 10% of cases in the western region that includes California, Ferrer said.
Arcturus has primarily been seen in India, and Ferrer said experts are still analyzing its effects. While no formal studies have been done, she said that anecdotal evidence out of India suggests the variant appears to be infecting young children at higher rates than other strains.
She also said the strain appears to be more often linked to the development of pink eye, or conjunctivitis. But Ferrer said the evidence is still anecdotal, so it’s still too early to say definitively that pink eye is more common with XBB.1.16.
Ferrer said the county will be closely monitoring spread of the virus strain, but she noted that XBB.1.16 and all other currently circulating strains are offshoots of the Omicron variant, which is targeted by the currently available COVID-19 vaccine booster.