Amazon is removing listings from its online marketplace that claim to help stop the spread of the coronavirus.

The company notified third-party merchants this week that it was taking down listings claiming to be a treatment, cure or remedy for the coronavirus, according to an email obtained by CNBC.

It comes as the coronavirus outbreak has continued to worsen. The coronavirus has spread to more than two dozen countries, infecting more than 75,700 people and killing at least 2,130, as of Thursday.

Last week, CNBC reported that Amazon was one of several tech giants that met with the World Health Organization at Facebook's Menlo Park, Calif. offices to discuss how to stop misinformation about the coronavirus on their platforms. Bad actors have attempted to make money off of fears around the coronavirus. On Amazon, sellers have offered books that stoke fears about the virus, while vitamin C products have increasingly surfaced because of false reports it can cure the coronavirus.

Now, Amazon appears to be cracking down on mentions of the coronavirus in products listed on its marketplace. In one case, Amazon told a seller it would remove their listing for a surgical face masks because it made "unapproved medical marketing claims." As of Thursday afternoon, the product was available for purchase on Amazon. The company told third-party sellers it would consider reinstating the flagged listings if they removed the "prohibited medical claims."

Here's an example of an email Amazon is sending to sellers who list products making claims about curing the coronavirus:

Hello from Amazon,

We are writing to let you know that the following detail pages have been removed from our catalog:

...

This product has been identified as a face mask or related product that makes unapproved medical marketing claims regarding coronavirus or the flu. Products that make medical marketing claims may not be legally marketed in the U.S. without prior review and approval by the Food & Drug Administration (FDA). Amazon policy prohibits the listing or sale of products that are marketed as unapproved or unregistered medical devices

We took this action because this product is not permitted for sale on Amazon.com. It is your obligation to make sure the products you offer comply with all applicable laws, regulations, and Amazon's policies.

Users in Facebook groups for Amazon sellers have shared similar stories of warnings they received from Amazon this week.

Although Amazon has taken steps to remove some listings mentioning the coronavirus, CNBC conducted a few quick searches and found several examples of products that appeared to flout these rules, including disinfectant sprays and cleaners that claimed to "kill" the coronavirus.

One listing for a spray disinfectant claimed it met the Center for Disease Control's (CDC) criteria "for use against the coronavirus." Peter Dornau, President and CEO of Star brite, which makes the product, said the CDC statement was added to the listing by a third-party seller, which resulted in Amazon taking down the listing for several days. The listing was later reinstated after Star brite removed the claim, Dornau said. Star brite is monitoring any third-party listings of its products to make sure the descriptions are accurate, Dornau added.

Another listing for a disinfectant from Kinzua Environmental also showed up for searches related to coronavirus on Amazon. It was not certified to kill the strain of virus that's currently causing the outbreak, but could kill other types of the virus. A representative from the company said he removed the listing.

Representatives from Amazon did not respond to requests for comment.