A deadly coronavirus or 2019-nCoV outbreak, which has infected more than 4,500 people and spread to 15 countries since emerging in China, has also spawned many false claims on social media.
Here's a selection of misinformation debunked by AFP's Fact Check service.
Sydney food not contaminated
In Australia, multiple Facebook posts shared hundreds of times claimed to show a list of foods and locations in Sydney which have been contaminated by the new coronavirus strain first discovered in the Chinese city of Wuhan in late December.
One post, published on January 27, identified different types of rice, cookies and onion rings that allegedly contain traces of the virus. It also claimed that a "bureau of diseasology" had run tests and discovered the strain in several Sydney suburbs.
But the local health authority told AFP the locations listed posed no risk to visitors, and the foods named did not appear in the New South Wales food authority's list of recalls and advisories.
Not Wuhan market
A video viewed more than 88,000 times on Facebook purported to show the market in Wuhan where the virus strain materialized. In reality, it was filmed at an Indonesian market.
The misleading post was published on an account in the Philippines on January 26, 2020. The footage showed bats, rats, snakes and an assortment of other animal meat products being sold at a bustling market.
However, a reverse image search using key frames extracted from the video led to another identical YouTube clip uploaded on July 20, 2019.
AFP was able to confirm the video was in fact captured at the Langowan market in Indonesia's North Sulawesi province.
Fake death projections
In Sri Lanka, a Facebook post shared thousands of times claimed doctors were projecting that the entire population of Wuhan -- a city of 11 million people -- would likely die of the novel coronavirus.
This is false; Chinese authorities have made no such projection.
There is currently no vaccine for the new strain of coronavirus. But the US Centres for Disease Control and Prevention stated that most people will recover on their own.
The post also claimed the virus could be caught by eating the meat of the Chinese cobra but this has not yet been established.
Salt water can't kill virus
Multiple posts on Weibo, Twitter and Facebook shared in January claimed top Chinese respiratory expert Zhong Nanshan had told people to rinse their mouths with salt water solution to prevent infection from a new virus outbreak.
But the claim is bogus; the expert's team said saline would not "kill" the new virus and urged people not to believe or share medically-inaccurate online rumors.
The World Health Organization also told AFP there was no evidence that saline solution would protect against infection from the new coronavirus.
Multiple posts on Facebook and Twitter alleged that the novel coronavirus was created on purpose -- with theories including that it was manufactured by the US Centers for Disease Control and Prevention.
The posts included patents to buffer their claim. But these were in fact patents registered in an effort to combat different strains of coronavirus, for example by developing vaccines.
False alarm in France
In France, several social media posts have circulated with claims that people had been contaminated with the novel coronavirus in the departments of Val d'Oise, Savoie, Lot-et-Garonne and Pyrenees-Orientales.
These false reports were accompanied by images made to look like they were screenshots from several French news sources -- including AFP.
However, these images were digitally manipulated. No cases have been confirmed in these departments.
See AFP's Fact Check blog https://factcheck.afp.com