The delta variant is spreading much faster than other strains of COVID-19. Here's why

REPORTER: GOOD EVENING. HERE IN MASSACHUSETTS, MO THAN 280,000 PEOPLE HAVE RECEIVED THE JOHNSON & JOHONNS VACCINE. FOR NOW, EXPERTS ARE RECOMMENDING THAT MOST OF THEM SHOULD TAKE A DEEP BREAT ANDH RELAX. MORE THAN THREE MONTHS AFTER JODIE CUTTER GOT HER SHOT OFHE T JOHNSON AND JOHNSON VACCINE. SHE'S NOW READING REPORTS THAT IT MIGHT BE LESS EFFECTIVE THAN ETH OTHER VACCINES. >> I WAS AITE L WORRIED. REPORTER: RESEARCHERS AT NYU TOOK BLOOD SAMPLES FROM PEOPLE WHO'D EACH RECEIVED ONE OF THE THREE APPROVED VACCINES IN THE US. THEY FOUND PFIZER AND MODERNA VACCINES, THBO DEVELOPED WITH MRNA TECHNOLGODYPR, ODUCED FEWER ANTIBODIES AGAINST THE DELTA VARIANT. HOWEVER, THEY FOUND THE BIGGEST ANTIBODY DROP-OFF WAS FOR THE JJ& VACCI. THE MRNA VACCINES GENERATE WAY HHER.IG HAVING ANTIBODIES LOWER THAN THAT, DOESN'T MEAN ANYTHING. RE PORTER: ONE OF THE AUTHOR OF THE STUDY SAYS J&J RECIPIENTS MIGHT WANT TO CONSIDER GETTING A BOOSTER SHOT. BUT SO FAR THE CCD IS NOT RECOMMENDING THAT NEITHER ARE THE EXPERTS WE SPOKE WITH AT LEAST IN MOST CASES >> NOW FOR IMMUNO-COMPROMISED PATIENTS, THAT'S A LITTLE BIT OF A DIFFERENT STORY. I THINK IT'S VERY LIKELY THAT IF YOU' IREMMUNO-COMPROMISED, YOU WILL NEED A BOOSTER A SOME POT.IN REPORTER: JODIE CUTTER, WHO IS IN GOOD HEALTH, SAYS SHE TRIED TO GET A BOOSTER SHOT BUT WAS TURNED AWAY. SHE SAYS SHE'LL TAKE ONE IF RECOMMENDED BUT IN THE MEANTIME DOES NOT PLAN TO CHANGE HER ILDA ROUNE.TI >> I'LL SOCIAL DISTANCE IF IT'S APPROPRIATE. BUT I FEEL VERY CONFIDENT THAT THE VACCINE I GOT IS GOING TO PROTECT ME FROM HOSPITALIZATION AND DEA.TH PORERTER: COUPLE OF QUICK NOTES OUABT THIS STUDY, THE NYU STUDY HAS NOT BEEN VERIFIED BY OTHER SCIENTISTS AND IT'S NOT YET OFFICIALLY PUBLISHED. JOHNSON AND JOHNSON IS WORKING ON ITS OWN STUDY ABOUT WHETHER BOOSTER IS A SEAF AND EFFECTI.VE BUT THE RESULTS HAVE NOT BEEN RELEASED. LIVE IN NEWTON,AV

Worldwide, there is an alarming surge in coronavirus cases — and health experts say a key factor in this latest wave is the highly contagious delta variant.The variant is spreading about 55% faster than the alpha strain that was first identified in the United Kingdom late last year, according to the World Health Organization (WHO) — and that strain spreads about 50% faster than the version that first began infecting people in late 2019."We should think about the delta variant as the 2020 version of COVID-19 on steroids," Andy Slavitt, a former senior adviser to President Joe Biden's COVID Response Team, told CNN last week.Here's what else you need to know about the variant, including why it's spreading so quickly.It was first identified in IndiaThe delta strain was first identified in India in December 2020.It rapidly became the dominant variant, overwhelming the country's health care system.It was identified in the United Kingdom soon after."This is the most contagious version of the virus we have seen throughout the whole pandemic," said Ashish Jha, dean of the Brown University School of Public Health. "It's really very contagious."Now, it's spread to all 50 US statesThe first case in the United States was identified in March, and by early July, it made up more than half of cases tested in the country. It now makes up 83% of U.S. cases, according to the U.S. Centers for Disease Control and Prevention."This is a dramatic increase, up from 50% for the week of July 3," CDC Director Dr. Rochelle Walensky said in a Senate committee hearing Tuesday.The delta variant has been found in all 50 U.S. states.That's behind a surge, mainly among unvaccinated people in the country — the average of new daily cases this week is up 55% from last week, with cases rising in 46 states as of Tuesday, according to data from Johns Hopkins University. Hospitalizations are up 52% over the past 14 days.The strain continues to spread rapidlyHow is the virus spreading so rapidly? One study suggests the delta variant may transmit faster than other strains because it makes more copies of itself inside our bodies at a faster rate.When scientists in China compared dozens of cases of delta to strains from early in the pandemic, they found that patients with the delta variant had viral loads that were 1,260 times higher."There's so much more virus around, people who are infected have such high viral loads, but even short periods of time — five minutes, seven minutes, you don't even have to be within six feet," Jha said."For people who are unvaccinated, they are getting infected with much, much shorter exposure."The vaccines available in the United States are proving to be effective against the delta variant. Although there are breakthrough cases, people who are fully vaccinated rarely become very sick.But less than half of the U.S. population is fully vaccinated, according to CDC data, and the CDC is warning of a "pandemic of the unvaccinated.""If you are unvaccinated, you are at great risk right now," Surgeon General Dr. Vivek Murthy said. "And you should take measures if you're unvaccinated, like masking, distancing, avoiding indoor gatherings."More than 97% of people getting hospitalized with COVID-19 now are unvaccinated, Walensky said last week.And 99.5% of deaths are among the unvaccinated, U.S. Surgeon General Dr. Vivek Murthy said Sunday.Getting people vaccinated as quickly as possible, Murthy said, "is our fastest, most effective way out of this pandemic."

Worldwide, there is an alarming surge in coronavirus cases — and health experts say a key factor in this latest wave is the highly contagious delta variant.

The variant is spreading about 55% faster than the alpha strain that was first identified in the United Kingdom late last year, according to the World Health Organization (WHO) — and that strain spreads than the version that first began infecting people in late 2019.

"We should think about the delta variant as the 2020 version of COVID-19 on steroids," Andy Slavitt, a former senior adviser to President Joe Biden's COVID Response Team, .

Here's what else you need to know about the variant, including why it's spreading so quickly.

It was first identified in India

The delta strain was in December 2020.

It rapidly became the dominant variant, overwhelming the country's health care system.

It was soon after.

"This is the most contagious version of the virus we have seen throughout the whole pandemic," said Ashish Jha, dean of the Brown University School of Public Health. "It's really very contagious."

Now, it's spread to all 50 US states

The first case in the United States was identified in March, and by early July, it made up more than half of cases tested in the country. It now makes up 83% of U.S. cases, according to the U.S. Centers for Disease Control and Prevention.

"This is a dramatic increase, up from 50% for the week of July 3," CDC Director Dr. Rochelle Walensky said in a Senate committee hearing Tuesday.

The delta variant has been found in all 50 U.S. states.

That's behind a surge, mainly among unvaccinated people in the country — the average of new daily cases this week is up 55% from last week, with cases rising in 46 states as of Tuesday, according to data from Johns Hopkins University. Hospitalizations are up 52% over the past 14 days.

The strain continues to spread rapidly

How is the virus spreading so rapidly? suggests the delta variant may transmit faster than other strains because it makes more copies of itself inside our bodies at a faster rate.

When scientists in China compared dozens of cases of delta to strains from early in the pandemic, they found that patients with the delta variant had viral loads that were 1,260 times higher.

"There's so much more virus around, people who are infected have such high viral loads, but even short periods of time — five minutes, seven minutes, you don't even have to be within six feet," Jha said.

"For people who are unvaccinated, they are getting infected with much, much shorter exposure."

The vaccines available in the United States are proving to be effective against the delta variant. Although there are breakthrough cases, people who are fully vaccinated rarely become very sick.

But less than half of the U.S. population is fully vaccinated, , and the CDC is warning of a "."

"If you are unvaccinated, you are at great risk right now," Surgeon General Dr. Vivek Murthy said. "And you should take measures if you're unvaccinated, like masking, distancing, avoiding indoor gatherings."

More than 97% of people getting hospitalized with COVID-19 now are unvaccinated, Walensky said last week.

And 99.5% of deaths are among the unvaccinated, U.S. Surgeon General Dr. Vivek Murthy said Sunday.

Getting people vaccinated as quickly as possible, Murthy said, "is our fastest, most effective way out of this pandemic."

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