Final answer:
The most common type of hepatitis transmitted through blood transfusion is Hepatitis C (HCV), characterized by a higher proportion of infected individuals becoming chronic carriers and its frequent undiagnosed status.
Step-by-step explanation:
The most common type of hepatitis transmitted by blood transfusion is Hepatitis C (HCV). While HAV and HEV are primarily contracted through ingestion, HBV, HCV, and HDV are transmitted via parenteral contact. Hepatitis C is notable for being often undiagnosed, leading to a higher risk of transmission. Blood transfusion, intravenous drug use, and the sharing of personal items like toothbrushes and razors are common transmission routes. A significant share of HCV-infected individuals become chronic carriers, making it a persistent healthcare challenge.
Although hepatitis B (HBV) is also associated with bloodborne transmission, and carries risks for healthcare workers and others through blood and body fluid exposure, universal vaccination and improved screening have reduced its incidence relative to HCV in the context of blood transfusions.