Secondary syphilis can cause swollen lymph nodes, fever, and fatigue.
Chlamydia during pregnancy can cause premature birth, and adversely affect the health of the mother and the newborn.
The efficacy of COVID-19 vaccines declines over time but the vaccines still have a protective effect.
Chest pain can be caused by heart conditions, gastrointestinal disorders, lung problems, or respiratory infections.
Flu can cause heart damage by reducing oxygen supply to the heart. The flu virus may also directly attack cardiac muscle cells.
Flu and stomach flu are caused by different pathogens, and have different symptoms and modes of transmission.
Untreated syphilis can destroy nasal cartilage and collapse the nose.
Syphilitic tonsillitis is the infection of the tonsils by the pathogen that causes syphilis.
Not all ticks carry Lyme disease, it depends on the animals they have been feeding on.
X-rays are useful to detect arthritis, but they can miss the early signs of the disease.
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