U.S. Food and Drug Administration

Agriculture Commissioner Nikki Fried said the pesticide, used to combat citrus greening disease, poses health and environmental risks.

Pfizer said in late March that clinical trials found "100% efficacy and robust antibody responses" to the coronavirus in 12- to 15-year-olds.

The third COVID-19 vaccine authorized for use in the U.S. requires one shot instead of two, and works a slightly different way from the others. Here's what we know about its safety and effectiveness.

The new deal effectively doubles the federal government's order from the company. Pfizer said the U.S. government has agreed to pay $1.95 billion for the additional doses.

The Food and Drug Administration greenlights the biotech firm's vaccine for emergency use in the U.S. The move bolsters a vast inoculation effort that's already underway.

Advisers to the Food and Drug Administration voted 20-0 to recommend that the agency authorize Moderna's vaccine for emergency use during the pandemic. There was a single abstention.

Two days before a panel of experts is set to review Moderna's COVID-19 vaccine and advise the Food and Drug Administration, documents show the vaccine is 94% effective and well-tolerated.

In a 17-4 vote, an expert committee concluded that the scientific evidence supports the authorization of the COVID-19 vaccine from Pfizer and BioNTech for emergency use during the pandemic.

A Pfizer board member says the government declined to buy more doses beyond the initial 100 million already agreed upon. Demand from other countries could complicate future purchases.

The Food and Drug Administration finds "no specific safety concerns" that would stand in the way of authorization of the vaccine for emergency use. Effectiveness is 95% after two doses.

Operation Warp Speed is allocating the first batch of 6.4 million COVID vaccines to states, based on population. This circumvents a CDC advisory committee, which proposed allocation based on risk.

The drug, which has been named Veklury, works by inhibiting a substance the coronavirus uses to make copies of itself. A large U.S. study found that the antiviral cut the recovery time by five days.