What is Hepatitis C from a Medical Perspective?
Hepatitis C is a viral infection caused by the hepatitis C virus (HCV), an RNA virus primarily transmitted through blood-to-blood contact. It is a leading cause of chronic liver disease globally, with:
Acute Hepatitis C: 15-25% of cases resolve spontaneously within 6 months.
Chronic Hepatitis C:…
What is Hepatitis B from a Medical Perspective?
Hepatitis B is a viral infection caused by the hepatitis B virus (HBV), a DNA virus that primarily targets the liver. It is classified as a global health concern and is transmitted through exposure to infected bodily fluids (blood, semen, vaginal secretions). The disease can manifest as:
…
What is Syphilis from a Medical Perspective?
Syphilis is a chronic, systemic infectious disease caused by the bacterium Treponema pallidum. It progresses in distinct stages and primarily spreads through sexual contact,母婴 transmission, and rarely via blood transfusions or direct contact with infected lesions. The disease is classified into:
Primary Syphilis: Initial infection marked by a…
What is HIV/AIDS from a Medical Perspective?
HIV (Human Immunodeficiency Virus) is a lentivirus that attacks the immune system, specifically targeting CD4+ T-cells. This progressive destruction weakens the body's ability to fight infections and cancers. AIDS (Acquired Immunodeficiency Syndrome) represents the final stage of HIV infection when the immune system is severely compromised, typically defined…
What is Gonorrhea?
Gonorrhea, also known as "the clap," is a sexually transmitted infection (STI) caused by the bacterium Neisseria gonorrhoeae. It primarily affects the mucous membranes of the reproductive and urinary tracts, including the cervix, urethra, rectum, throat, and eyes. The infection spreads through:
Unprotected sexual contact (vaginal, anal, or oral)
Blood transfusions…
Professional Medical Interpretation of Chlamydia Infection (2023 Updated Edition)
Author: Dr. Zhang Weiming, Chief Physician Certified by: Infectious Diseases Branch of Chinese Medical Association Last Updated: August 20, 2023
I. Pathogenic Characteristics of Chlamydia
Medical Definition: Chlamydia (Chlamydia trachomatis) is a Gram-negative obligate intracellular bacterium with unique developmental cycles:
Elementary Body (EB): Infectious phase, diameter 0.2-0.4μm
Reticulate Body…