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Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.
Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.
Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
Individuals are never “cured” of addictions. Instead, they learn how to manage their disease to lead healthy, balanced lives.
Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
![Percentage of Foreign-Born Whites and Native Whites of Foreign or Mixed Parentage in Total Populatio](https://biology-forums.com/gallery/47/medium_6_24_08_15_12_36_53_224201087.png)
![Drug tolerance: A shift in the dose-response curve to the right as a result of exposure to the drug.](https://biology-forums.com/gallery/30/medium_548020_07_06_17_9_28_55_304431367.png)