Match the pathogen with the listed disease(s) it causes.


___ Chlamydophila psittaci
___ Chlamydophila pneumoniae
___ Chlamydia trachomatis
___ Treponema pallidum pallidum
___ Treponema pallidum pertenue
___ Treponema pallidum endemicum
___ Treponema carateum
___ Borrelia burgdorferi


A. Syphilis
B. Trachoma
C. Sinusitis
D. Lymphogranuloma venereum
E. Proctitis
F. Pelvic inflammatory disease
G. Ornithosis
H. Yaws
I. Bejel
J. Pinta
K. Lyme disease

Verified step by step guidance

1. Step 1: Understand the pathogens and their general disease associations. For example, Chlamydophila and Chlamydia species are bacteria known to cause respiratory and sexually transmitted infections, while Treponema species are spirochetes associated with various treponemal diseases, and Borrelia burgdorferi is the causative agent of Lyme disease.
2. Step 2: Match Chlamydophila psittaci with its disease. This pathogen is primarily linked to a zoonotic respiratory infection transmitted from birds, known as ornithosis.
3. Step 3: Identify diseases caused by Chlamydophila pneumoniae and Chlamydia trachomatis. Chlamydophila pneumoniae is often associated with respiratory conditions such as sinusitis, while Chlamydia trachomatis causes several diseases including trachoma (an eye infection), lymphogranuloma venereum (a sexually transmitted infection), proctitis, and pelvic inflammatory disease.
4. Step 4: Match the Treponema pallidum subspecies with their respective diseases. Treponema pallidum pallidum causes syphilis; Treponema pallidum pertenue causes yaws; Treponema pallidum endemicum causes bejel; and Treponema carateum causes pinta. Each of these diseases has distinct epidemiological and clinical features.
5. Step 5: Assign Borrelia burgdorferi to Lyme disease, a tick-borne illness characterized by multisystem involvement including skin, joints, and nervous system.

Key Concepts

Pathogen-Disease Specificity

Each pathogen species or subspecies is associated with specific diseases due to unique virulence factors and tissue tropisms. Understanding which microorganism causes which disease helps in diagnosis and treatment. For example, different Treponema pallidum subspecies cause distinct diseases like syphilis, yaws, and bejel.

Chlamydophila and Chlamydia Infections

Chlamydophila and Chlamydia are obligate intracellular bacteria causing various diseases. Chlamydophila psittaci causes ornithosis, a zoonotic respiratory infection, while Chlamydophila pneumoniae is linked to respiratory illnesses like sinusitis. Chlamydia trachomatis causes sexually transmitted infections and trachoma, an eye disease.

Spirochete Bacteria and Their Diseases

Spirochetes like Treponema and Borrelia species cause distinct diseases characterized by chronic infection and systemic symptoms. Treponema pallidum subspecies cause syphilis and related endemic treponematoses, while Borrelia burgdorferi is the agent of Lyme disease, transmitted by ticks and causing multisystem illness.