The genus Listeria contains six species, two of which are pathogenic: Listeria monocytogenes, the food-borne human pathogen responsible for listeriosis, on which this chapter is focused, and L. ivanovii, an animal pathogen.. Phages of Listeria monocytogenes are, with a few exceptions, specific with respect to the serogroup of the host cells. The major serogroups (1/2 and 4) can be differentiated on the basis of somatic antigen composition and sugar substitution of cell wall teichoic acids (TAs) (. ).
Eyelid swelling has many causes (see Table: Some Causes and Features of Eyelid Swelling). It usually results from an eyelid disorder but may result from disorders in and around the eye socket (orbit) or from disorders elsewhere in the body that cause widespread swelling. Common causes.
When these glands don't function properly, known as Meibomian gland dysfunction (MGD), it can result in dry patches on your eyes. These become sore, and extra tears are produced as a reflex. This is the most likely cause of watering eyes. Other causes. Other problems that can cause extra tears to be produced include: the lower eyelid sagging away from the eye â this makes it difficult for tears to reach the drainage ducts ; eyelids that roll inwards inflammation of the edges of the eyelids (blepharitis) blocked or narrowed tear ducts ; eye irritation (for example, from chemical fumes or grit)