A dangerous new Covid variant from China is surging in California, health officials warn.

The California Department of Public Health warned this week the highly contagious

NB.1.8.1 strain has been detected in the state, making it the sixth US state to be exposed.

The variant has also been detected in international travelers arriving in Washington state, Virginia, Hawaii, Rhode Island and New York City since March.

Health officials said the variant was first detected in March and has been on the rise since May 1.

Since April, NB.1.8.1 has increased from two percent of Covid cases in California to 19 percent, according to health department data.

Lab tests suggest NB.1.8.1, which was first detected in January in China, is more infectious than currently circulating strains, which means it could lead to a spike in infections and hospital admissions.

World Health Organization data also suggests it makes up more than half the variants currently circulating.

The warning comes as some physicians in California have called for the return of mask mandates to emulate countries like Hong Kong.

he California Department of Public Health told The Sacremento Bee: ‘COVID-19 continues to circulate in California and future seasonal increases in disease levels are likely.’

NB.1.8.1 is not yet prevalent enough in the US to be publicly tracked by the CDC. Strain LP.8.1 is currently the most dominant in the US, making up 73 percent of Covid infections.

The latest vaccines target the JN.1 variant, which LP.8.1 is descended from.

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The California Public Health Department said: ‘Currently available vaccines are expected to remain effective.’

However, health secretary Robert F Kennedy Jr has moved to remove access to the Covid vaccine for healthy children and pregnant women.

However, it is currently still on the CDC’s children’s vaccine schedule.

Covid tests in California as of April 19, the latest data available, show 2.1 percent of tests came back positive, a steady rate compared to weeks prior.

The rate of hospitalizations from Covid during the week of April 19 in California was 1.3 per 100,000 people, a slight decrease from 1.6 per 100,000 the week before.

There is usually a delay of several weeks for the most recent data, and infections can take several weeks to result in hospitalization.

Nationally, Covid test positivity has decreased from 2.9 percent May 17 to 2.7 percent the week of May 24. Covid-related emergency department visits have also decreased 6.5 percent during that time frame.