Amazon said Wednesday it has closed its $3.9 billion acquisition of the primary care organization One Medical.

The e-commerce giant has said the buyout, which was announced in July, is a key component of its growing health care business, which includes its online drugstore Amazon Pharmacy and a patient to doctor messaging service called Amazon Clinic.

One Medical, which was owned by an Francisco-based 1Life Healthcare Inc, has about 815,000 members and 214 medical offices in more than 20 markets. Its membership-based service offers virtual care as well as in-person visits.

The two companies said Wednesday membership to the service will be available to new U.S. customers for $144 � a 28% discount – for the first year.

Anti-monopoly groups have been calling on the Federal Trade Commission to block Amazon�s purchase of the company, arguing it would endanger patient privacy and give the online retailer more dominance in the marketplace.

Last September, both One Medical and Amazon received a request for additional information from the FTC in connection with a review of the merger. Though the agency hasn�t brought forth a lawsuit to block the merger, its not ruling out any challenges in the future.

�The FTC�s investigation of Amazon�s acquisition of One Medical continues,� FTC spokesperson Peter Kaplan said in a statement. �The commission will continue to look at possible harms to competition created by this merger as well as possible harms to consumers that may result from Amazon�s control and use of sensitive consumer health information held by One Medical.�

The One Medical purchase is the first acquisition made under Amazon CEO Andy Jassy, who took over from founder Jeff Bezos in 2021 and sees health care as a growth opportunity for the company.

�Customers want and deserve better, and that�s what One Medical has been working and innovating on for more than a decade. Together, we believe we can make the health care experience easier, faster, more personal, and more convenient for everyone,� Jassy said in a statement.

The FTC is also reviewing Amazon�s $1.65 billion planned purchase of iRobot, which was announced last August.

(AP)