(LOS ANGELES) — COVID-19 cases are rising in Los Angeles County as the BA.2 variant continues to spread throughout the United States.

Data from the L.A. County Department of Public Health shows 1,088 new cases of the virus were recorded Thursday with a seven-day rolling average of 841 new cases per day.

That average is a 40% increase from the average of 601 cases per day recorded two weeks earlier, according to the data.

Additionally, the seven-day average of positive tests rose to 1.0% from 0.7% over the same period.

However, officials believe the number of positive cases is an “undercount” because many people who test positive use rapid at-home tests and don’t report their results.

During a press conference Thursday, L.A. County Public Health Director Dr. Barbara Ferrer said there were 14 new outbreaks in schools for the week ending Tuesday compared to four outbreaks the prior week.

One of the active outbreaks, which occurred at a high school, started with 26 cases and has since grown to 60 cases.

Health experts said the surge of cases is, in part, due to BA.2, a subvariant of the original omicron variant.

Ferrer revealed during the press conference that the highly infectious subvariant accounted for 46.5% of samples that underwent genomic sequencing, up from 31.8% the week prior.

Because the most recent date for which subvariant-specific data is available in Los Angeles is March 19, Ferrer said she expects BA.2 may now make up more than half of all COVID-19 infections in the county.

This is in line with data from Centers for Disease Control and Prevention, showing BA.2 makes up 75% of all cases in the Western region, which includes California, Arizona and Nevada.

“Given that BA.2 is more transmissible than the earlier strains of omicron, it’s very likely BA.2 is now the predominant subvariant in L.A. County,” Ferrer said.

The Los Angeles County Department of Public Health did not return ABC News’ request for comment.

The spread of the variant mirrors what’s been seen in several countries in Europe, including England, which hit a record-high 1 in 13 people being infected with the virus last week, according to the U.K.’s Office for National Statistics.

However, experts said the rise in cases can also be attributed to the relaxing of public health measures.

“People are letting down their guard in terms of distancing, masking and attending crowded events,” Dr. Otto Yang, associate chief of infectious diseases and a professor of medicine at the David Geffen School of Medicine at the University of California, Los Angeles, told ABC News. “It’s not rocket science. We know how the virus spreads. We know if we relax the measures, it will spread more.”

Ferrer said the relaxing of indoor masking is also one of the reasons behind school outbreaks.

However, hospitalizations and deaths due to the virus in L.A. County continue to remain low.

In the last two weeks, daily hospitalizations have dropped from 373 to 273, according to county data.

Meanwhile, the daily number of deaths currently sits at 15, down from 16 the week before, the data shows.

Yang said the low numbers are due to several factors including high vaccination rates, effective treatments and some prior immunity from infection during the previous omicron wave.

But he warned that these figures could rise in the next few weeks.

“These indicators lag so it takes time [during a surge] before people become seriously ill and die,” Yang said.

Yang also encouraged residents to get their booster shots if they haven’t already and to consider wearing masks around family members or friends at high risk of severe illness.

“If you are at risk of giving it to someone who would have a severe case, consider wearing a mask and avoiding indoors crowded events,” he said. “The same measures will still work. Even if your personal risk isn’t high, think about the people around you.”

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(NEW YORK) — Despite a recent increase in COVID-19 breakthrough infections, an updated report illustrates the significant impact the nation’s vaccine campaign has had in preventing millions of virus-related deaths, hospitalizations and infections.

The U.S. COVID-19 vaccine program is now estimated to have prevented 2.2 million deaths, 17 million hospitalizations and 66.1 million additional infections through March 2022, according to updated modeling from the Commonwealth Fund, an organization advocating for improved healthcare for marginalized communities.

In the analysis of recent trends, researchers estimated that the daily peak of deaths pre-omicron, and without vaccination, would have exceeded 24,000 per day, far surpassing the actual peak of 4,300 per day, experienced by the country during the winter of 2021.

Without the vaccines, the omicron wave could have been substantially larger, the study suggested.

In addition, the researchers estimate that without vaccines, there would have been nearly $900 billion in associated health care costs.

The model accounts for waning immunity and changes in population behavior over time, as schools and businesses have reopened and travel has increased. As immunity wanes, researchers stressed that “redoubling efforts to increase vaccine uptake, especially among the elderly and other vulnerable groups, will be critical to avert outbreaks as pandemic restrictions are lifted,” particularly as the omicron subvariant, BA.2, spreads.

“Our findings point to the tremendous power of vaccination to reduce disease burden from COVID-19. This may be even more important if newer variants arise or population immunity ebbs. Without continued funding, the lifesaving impact of vaccinations are at risk,” researchers said.

Former President Donald Trump and President Joe Biden have both taken credit for the development and implementation of the COVID-19 vaccine.

Following the release of the study, the White House said in a statement that the loss prevented by the vaccine is the “the result of the Biden Administration’s efforts to use every tool to make vaccinations easy and convenient for every American, Congress providing us the vital resources we needed, and the American people stepping up and doing their part.”

“Together, we’ve spared millions of families the immeasurable loss that too many others have suffered, and turned unthinkable pain into extraordinary purpose and progress,” the statement said.

Trump has also touted his administration’s leadership in the nation’s vaccine rollout, asserting that the vaccines would not have been developed at such a fast pace without his pressure on drug companies.

“There are some people that say my greatest achievement was getting the vaccine, because the vaccine was said to take three to five years, and most people said it wasn’t going to happen,” Trump said during a panel interview at Princeton University in July 2021. “We made maybe one of the best bets in history because we bought billions and billions of dollars worth of the vaccine by saving time long prior to knowing whether or not it was going to work.”

Despite Trump’s support of the COVID-19 vaccine, last month, an ABC News analysis of federal data found that on average, the death rates in states that voted for Trump were more than 38% higher than in states that voted for Biden, following the widespread availability of vaccines.

“The irony of course, is that the Trump administration was responsible for fighting for this pandemic funding, in fast-tracking the vaccine process that has really saved a lot of lives,” Peter Jacobson, professor emeritus of health law and policy at the University of Michigan School of Public Health, told ABC News.

In order to protect more Americans moving forward, the Biden administration and its top health officials, including Dr. Anthony Fauci, chief medical adviser to the White House, and Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, have continued to push for COVID-19 funding.

“COVID-19 is not over. And we have an obligation to protect our country, the American people and make sure we’re taking steps to prepare,” White House press secretary Jen Psaki said during a press conference this week.

The White House asserted inaction on funding for Covid-19 relief will leave the nation vulnerable to the emergence of future surges and variants. Weekly allocations of many COVID therapies have already been scaled down with the funding stalled in Congress.

“This is deeply disappointing – and it should be unacceptable to every American. We’ve worked too hard and come too far to leave ourselves and our economy vulnerable to an unpredictable virus,” the White House statement said.

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