This document discusses several pathogenic bacteria and the diseases they cause. It notes that subtypes C of Chlamydia trachomatis cause trachoma, a chronic eye infection that can lead to blindness, and are often accompanied by secondary bacterial infections. Subtype K can cause eye infections from genital secretions. Neisseria gonorrhoeae causes gonococcal ophthalmia in newborns, leading to blindness if not treated promptly. Moraxella catarrhalis is a common cause of ear infections in children after age 2 months. Pseudomonas aeruginosa causes external ear infections like swimmer's ear but can also cause a life-threatening deep ear infection in diabetic patients called malignant otitis ex

2.  Attributes of pathogenicity. Some toxic
effects of antigens kill host cells.
 Clinical diseases
 Subtypes C
 cause a chronic keratoconjunctivitis (trachoma) that
can progress to conjunctival and corneal scarring and
blindness.
 are frequently accompanied by a concomitant
secondary bacterial infection.
 cause neonatal pneumonia.

3.  Subtypes K
 can be self-inoculated from genital secretions into the
eye, resulting in an inclusion conjunctivitis.
 Laboratory diagnosis is similar to that for
genital infections with this agent.
 Control. Treatment is with doxycycline or
erythromycin.

4.  causes gonococcal ophthalmia.
 is generally apparent in the first 5 days of
life; most often seen in babies born at home
without medical care and prophylaxis.
 is a hyperpurulent conjunctivitis.
 is rapidly destructive and, if not treated
promptly, leads to blindness.

5.  biotype aegyptius causes bacterial pinkeye
 is an epidemic, purulent conjunctivitis.
 occurs often in school-age children but also
spreads to adults.

6.  is the most common cause of otitis media in
infants older than 2 months of age.
 is treated with penicillin, although there are
resistant strains.

7.  is the second most common causative agent
of otitis media in children, after S
pneumoniae.
 often recurs, probably due to drug
resistance.
 is most commonly caused by
nonencapsulated strains.

8.  causes otitis externa (swimmer's ear•),
sometimes along with normal flora.
 causes malignant otitis externa, an invasive
pseudomonad infection that is generally
found in diabetic patients and may be life
threatening.