The new tool provides near real-time availability information to help people find locations to schedule vaccine appointments.
Multisystem Inflammatory Syndrome in children is a rare condition characterized by inflammation in different parts of the body.
The vaccine could soon become the third COVID-19 shot to be approved for emergency use in the United States.
Researchers from the University of California, San Francisco, say it should be listed as a "variant of concern."
Fauci also said that the country would have enough vaccine doses to offer one to anyone in the country who wants it by July.
"The hearts of all Oregonians are with you today," Governor Kate Brown said in a statement addressing the family of the deceased infant.
Health authorities are urging immunized people to continue taking the standard precautions such as social distancing and wearing masks.
"It's a huge concern to see the resurgence of Ebola in Guinea, a country which has already suffered so much from the disease," said WHO Regional Director for Africa, Dr Matshidiso Moeti.
Walgreens is participating in the Federal Retail Pharmacy Program, which aims to increase access to COVID-19 vaccination across the United States.
More than 46 million vaccine doses have been administered across the country, according to the Centers for Disease Control and Prevention.
Scientists are investigating how emerging COVID variants may affect the protection provided by vaccines.
"This is not the time to be letting our guards down," the adviser said.
The website's founder has said that he set it up to ensure no vaccines against COVID-19 are wasted.
The United States has authorized two COVID-19 vaccines, Pfizer-BioNTech and Moderna, for emergency use to date.
Johnson & Johnson say their vaccine is 66 percent effective overall in preventing moderate to severe COVID-19.
Common side effects of COVID-19 vaccines, which tend to be minor and short-term, include pain and swelling at the injection site, fever, tiredness, chills or a headache.
The U.S. company's vaccine, which may require only one injection, is being assessed in a Phase III clinical trial involving about 45,000 people.
The B.1.1.7 variant has now been found in more than 20 U.S. states.
Almost 200 cases of the more infectious variant have been detected across the United States.
To date, the Food and Drug Administration has authorized two monoclonal antibody therapies for emergency use in the treatment of COVID-19.
Scientists say the variant is significantly more transmissible, although it does not appear to cause more severe disease.
"I think the vaccine is imperative," the woman, whose name is Raana Bell, said, while calling for there to be more transparency regarding the shots.
"It's definitely home-grown and widespread," said researcher Keith Gagnon from Southern Illinois University.
"We fear this mutation might have an impact, and what we don't know is the extent of the impact," said researcher Penny Moore.
Scientists say it is currently unclear whether or not the new variant is more transmissible and if vaccines will be less effective against it.
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The variant appears to be significantly more transmissible than the original, although it does not seem to cause more severe illness.
Fauci's comments come as the U.S. reported more than 4,000 COVID-19 deaths on Thursday—a new daily record for the pandemic.
"We are not where we want to be, there's no doubt about that," Fauci said.
The WHO official's comments come as U.S. airports recorded their busiest day of the pandemic over the weekend.