The Food and Drug Administration on Monday granted full approval of the Pfizer vaccine, becoming the first COVID-19 vaccine to transition from an emergency authorization status to full FDA approval.

The full approval indicates that Pfizer has shown enough effectiveness and safety data to meet the stringent Biologics License Application requirements, which includes at least six months of safety data from a majority of the volunteers in a large, final stage clinical trial.

Pfizer's full approval will pave the way for further vaccine mandates in both the public and private sector. Some businesses and state leaders have held off thus far, signaling they'd wait for full approval before imposing tighter requirements.

Federal, state and local health officials have also expressed optimism that full approval will help dissolve some of the lingering hesitancy around taking a shot that until now has been only authorized for emergency use.

Acting FDA Commissioner Janet Woodcock called Monday's announcement a "pivotal moment" made possible by a "rigorous and thorough review" done in record time.

"Working around the clock, FDA staff were able to complete the evaluation of this biologics license application in just over three months," she said. "This is an unprecedented timeline given the volume of review and the meticulous manner in which it was done, but we want to underscore that our efforts to move as quickly as possible have in no way sacrifice scientific standards for the integrity of our process."

President Joe Biden said Monday, "If you're one of the millions of Americans who've said that they will not get the shot until it has full and final approval of the FDA -- it has now happened.

-ABC News' Sasha Pezenik

More than 180,000 new COVID-19 cases were reported among kids last week, reaching levels of the previous winter surge of 2020-2021, according to a new report from the American Academy of Pediatrics and the Children’s Hospital Association.

More than 4.59 million children have tested positive for COVID-19 since the onset of the pandemic. Last week, children represented 22.4% of all reported cases.

Severe illness due to COVID-19 remains "uncommon" among children, the two organizations wrote in the report. In nearly two dozen states, 0.2%-1.9% of all child COVID-19 cases resulted in hospitalization.

AAP and CHA, however, warned that there is an urgent need to collect more data on the long-term consequences of the pandemic on children, "including ways the virus may harm the long-term physical health of infected children, as well as its emotional and mental health effects."

-ABC News' Arielle Mitropoulos

The Pentagon will move forward with making the Pfizer vaccine mandatory now that it has been fully approved by the FDA, Pentagon press secretary John Kirby said Monday.

Defense Secretary Lloyd Austin announced on Aug. 9 that he would seek authorization to mandate the vaccine for the military unless the FDA approved it before Sept. 15.

“Now that the Pfizer vaccine has been approved, the department is prepared to issue updated guidance, requiring all service members to be vaccinated," Kirby said at a briefing. "A timeline for vaccination completion will be provided in the coming days."

-ABC News' Luis Martinez

All of New York City’s nearly 150,000 public school employees must receive at least one vaccine dose by Sept. 27, Mayor Bill de Blasio will announce Monday. The new vaccination policy will not allow weekly testing as an option.

At least 63% of New York City's Department of Education employees are already vaccinated, Schools Chancellor Meisha Porter said.

The previous requirement allowed for weekly testing of the unvaccinated, with unpaid suspensions for workers who didn't comply.

New York City's school year starts on Sept. 13.

-ABC News' Aaron Katersky

A Tallahassee judge ruled Friday that Florida school boards can enact student mask mandates, going against Gov. Ron DeSantis, who in July issued an executive order that set off a public feud with school districts.

Judge John C. Cooper found that a blanket ban on face masks in schools "does not meet constitutional muster" and ordered the Florida Department of Education to stop enforcing a state rule that requires districts to allow parents to opt-out of mask mandates.

Cooper, over about two hours, picked apart the state's defense, saying the science presented during the weeklong trial did not support the state's argument against masking children.

Ten Florida school districts have adopted mask mandates for students this month. Two -- Broward and Alachua -- were sanctioned by the Florida commissioner of education, who said he would begin withholding the salaries of board members who voted to require masks.

DeSantis will "immediately appeal" the ruling, the governor's press secretary, Christina Pushaw, said in a statement. "This ruling was made with incoherent justifications, not based in science and facts," Pushaw said.

A spokesman for the Florida Department of Education said, "We are immensely disappointed that the ruling issued today by the Second Judicial Circuit discards the rule of law. This decision conflicts with basic and established rights of parents to make private health care and education decisions for children. ... We are committed to the fundamental rights of parents and will push forward on appeal to ensure that this foundation of democracy is upheld."

-ABC News' Will McDuffie