CNN Profiles - Elizabeth Cohen - Senior Medical Correspondent - CNN

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A boy receives a dose of the Pfizer/BioNTech Covid-19 vaccine at the Clalit Healthcare Services in the Israeli city of Holon near Tel Aviv on June 21, 2021, as Israel begins coronavirus vaccination campaign for 12 to 15-year-olds. - Israel is now urging more 12- to 15-year-olds to be vaccinated, citing new outbreaks attributed to the more infectious Delta variant. (Photo by JACK GUEZ / AFP) (Photo by JACK GUEZ/AFP via Getty Images)

CDC warns of 'pandemic of the unvaccinated'

Tablets believed to be laced with fentanyl are displayed at the Drug Enforcement Administration Northeast Regional Laboratory on October 8, 2019 in New York. - According to US government data, about 32,000 Americans died from opioid overdoses in 2018. That accounts for 46 percent of all fatal overdoses. Fentanyl, a powerful painkiller approved by the US Food and Drug Administration for a range of conditions, has been central to the American opioid crisis which began in the late 1990s. (Photo by Don EMMERT / AFP) (Photo by DON EMMERT/AFP via Getty Images)

During the pandemic, another devastating health crisis was growing

Karen Martin receives a COVID-19 vaccine at a vaccination clinic hosted by James River Church West Campus in conjunction with Jordan Valley Community Health Center in Springfield, Mo. on Monday, July 12, 2021.

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CDC warns Covid-19 vaccines might not protect people who are immunocompromised

Five undervaccinated clusters put the entire United States at risk

TOPSHOT - US Vice President Kamala Harris receives her second dose of the Moderna Covid-19 vaccine from National Institutes of Health (NIH) Nurse Practitioner Judy Lai Yee Chan, at the NIH in Bethesda, Maryland, on January 26, 2021. (Photo by Brendan Smialowski / AFP) (Photo by BRENDAN SMIALOWSKI/AFP via Getty Images)

Data identifies 5 undervaccinated clusters in the US. See where they are

Man with Alzheimer's falls in love with wife all over again

A healthcare worker administers a dose of the Pfizer-BioNTech Covid-19 vaccine to a teenager at Holtz Children's Hospital in Miami, Florida, U.S., on Wednesday, May 18, 2021. Coronavirus cases in the U.S. increased 0.1% as compared to the same time yesterday to 33 million, as of 5:49 a.m. New York time, according to data collected by Johns Hopkins University and Bloomberg News. Photographer: Eva Marie Uzcategui/Bloomberg via Getty Images.

To fully vaccinate children against Covid-19 by the time school starts, many pa