According to research done by scientists, onions can absorb the flu bacteria present in a room or house. The research states that, when the onions are placed in a room, they have a possibility of absorbing harmful bacteria and organisms present. Onions are also known to relieve flu symptoms by the World Health Organization. This is according to, http://www.globalhealingcenter.com/natural-health/onion-flu-remedy/.
Sherry - Snopes is not a great reference source for information. The couple that run the site are not investigators and use Google to fact check articles. There is plenty of information out there that says this email info passed around is a hoax or unproven, but there are just as many verifying the information. It has been scientifically proven that onions do absorb the flu virus, but how it works or helps has not as yet been determined.
Simply put:NO - Anyone that claims this is true would like to cast spells as well! I especially like when people use the World Health Organization as support. They Do not now, nor have they ever supported such nonsense!