US gets almost all of the world's supply of key Covid-19 drug

Vials of the antiviral drug remdesivir, which is made by Gilead Sciences.

(CNN)The United States has been allocated almost all of the next few months' supply of remdesivir, the only drug that's known to work directly against Covid-19.

The Department of Health and Human Services (HHS) announced Monday that it had secured 100% of drug-maker Gilead's projected production for July, and 90% of its production for August and September -- plus more for clinical trials.
"President Trump has struck an amazing deal to ensure Americans have access to the first authorized therapeutic for Covid-19," said HHS Secretary Alex Azar in a news release.
    HHS has secured more than 500,000 treatment courses of the antiviral drug for US hospitals through September, according to the release. Remdesivir is the only drug that has an emergency use authorization from the US Food and Drug Administration to treat coronavirus, and it is patented by Gilead Sciences.
    Another drug, the widely available steroid dexamethasone, is useful for providing supportive care to the sickest Covid-19 patients who require ventilation or oxygen, according to preliminary research from the UK.
    Gilead had donated a supply of 1.5 million doses of remdesivir to countries across the world, which it says is enough for around 140,000 treatment courses. Almost a million doses were reserved for the US, according to the HHS, but the supply is now running out.
    The US government's last shipment of the donated antiviral drug went out this week. Gilead is ramping up to make more, but it's unclear how much will be available this summer.
    The company has said it plans to have more than 500,000 treatment courses available by October, and more than 2 million by December, but it is uncle