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Here is a post I found on another site dealing with Hepatitis C genotypes and where they originate adn are more prevalent.


Classifications

Biologists are generally not known for creativity when it comes to naming things - hence hepatitis C virus. The most commonly used classification of hepatitis C virus has HCV divided into the following genotypes (main types): 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11. As we've highlighted, HCV genotypes can be broken down into sub-types, some of which include:


1a, 1b, 1c
2a, 2b, 2c
3a, 3b
4a, 4b, 4c, 4d, 4e
5a
6a
7a, 7b
8a, 8b
9a
10a
11a

Genotype patterns

It is believed that the hepatitis C virus has evolved over a period of several thousand years. This would explain the current general global patterns of genotypes and subtypes:


1a - mostly found in North & South America; also common in Australia
1b - mostly found in Europe and Asia.
2a - is the most common genotype 2 in Japan and China.
2b - is the most common genotype 2 in the US and Northern Europe.
2c - the most common genotype 2 in Western and Southern Europe.
3a - highly prevalent here in Australia (40% of cases) and South Asia.
4a - highly prevalent in Egypt
4c - highly prevalent in Central Africa
5a - highly prevalent only in South Africa
6a - restricted to Hong Kong, Macau and Vietnam
7a and 7b - common in Thailand
8a, 8b & 9a - prevalent in Vietnam
10a & 11a - found in Indonesia


It's believed that of the estimated 160,000 Australians with HCV, approx. 35% have subtype '1a', 15% have '1b', 7% have '2', 35% have '3' (mostly being 3a). The remaining people would have other genotypes.


Genotype and treatment


Current scientific belief is that factors such as duration of a person's HCV infection, their HCV viral load, age, grade of liver inflammation or stage of fibrosis may play an important role in determining response to interferon treatment. Recent studies have suggested that a person's HCV subtype (or subtypes) may influence their possible response to interferon, or interferon-ribavirin combination treatment. World-wide trials are being conducted which will soon shed more light on this belief.





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