Clostridium botulinum is spor former bacterium which exists in soil, spring water and sea. Canned foods are the important source of C. botulinum, because it easily can multiply in anaerobic conditions. C. botulinum causes causes the flaccid muscular paralysis seen in botulism by producing neurotoxin botulin.
Clostridium botulinum Protection

When you buy canned foods, you must not [...]

L. monocytogenes is a foodborne pathogen that causes human listeriosis. It is stubborn pathogen which can tolerate salt, pH changes, refrigerated temperatures and inadequate thermal pasteurisation.
Scientist have been developed several test kits which use antibodies to determine L. monocytogenes. But according to US and Indian scientists, these test kits are not sensitive and rapid enough.
The [...]

Listeria monocytogenes causes infection. This is the most common bacterium founded in environment. It can even multiply freeze temperatures. Raw meat, frozen foods, chicken, cheese and cream are may sources of L. monocytogenes.

Listeria monocytogenes Protection

After you buy frozen foods, you should keep them cold. You should not buy foods that include ice crystals in or [...]