Notes on Skin and Eye Infections

Overview of Skin and Eye Infections

Keratitis

Keratitis is an inflammation or infection of the cornea, the clear front layer of the eye. It can be caused by a variety of pathogens, including:

• Herpes simplex virus: A common viral cause known for its potential to cause recurrent infections.

• Acanthamoeba: A free-living amoeba that can cause severe keratitis, often associated with contact lens wear.

• Various bacteria: Including but not limited to Staphylococcus and Pseudomonas species, which can lead to serious complications if untreated.

Large Pustular Skin Lesions

These lesions can be indicative of severe infections and are caused by:

• Leishmania species: Parasites transmitted by sandfly bites, causing cutaneous leishmaniasis resulting in skin ulcers.

• Bacillus anthracis: The bacterium that causes anthrax, particularly in its cutaneous form, leads to severe skin ulcers and systemic disease if not promptly treated.

Conjunctivitis

Conjunctivitis, or pink eye, is the inflammation of the conjunctiva, often causing redness and discharge. Causes include:

• Neisseria gonorrhoeae: A bacterial pathogen responsible for purulent conjunctivitis, notably in newborns (ophthalmia neonatorum) if transmitted during birth.

• Chlamydia trachomatis: Another bacterial cause that may lead to chronic infection and potential vision loss if untreated.

• Various bacteria and viruses: Viral conjunctivitis is commonly due to adenoviruses, associated with watery discharge and often accompanying upper respiratory infections.

Staphylococcal Scalded Skin Syndrome

This condition is caused by Staphylococcus aureus, which produces exfoliative toxins leading to skin peeling, primarily affecting neonates and young children.

Maculopapular Rash Diseases

• Measles virus: A highly contagious virus causing fever, cough, and a characteristic rash.

• Rubella virus: Known for causing congenital anomalies when contracted during pregnancy.

• Parvovirus B19: Causes fifth disease, presenting as a