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There are vaccines to prevent infectious hepatitis and serum hepatitis, but none to prevent chronic hepatitis. Discuss why this is so.
Yield
The income return on an investment, such as the interest or dividends received, expressed annually as a percentage based on the investment's cost, its current market value, or its face value.
Quoted Price
The last price at which a security or commodity traded, often used as a reference to gauge market value.
Current Yield
The annual income (interest or dividends) divided by the current price of the security.
Semiannually
Occurring twice a year; typically every six months.
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