Hepatitis C virus is known to transmit through blood and blood products. The high prevalence of the disease among patients who take intramuscular vaccination supports this finding.
There is a high prevalence of the disease in Egypt as a result of parenteral antimonial treatment. Therefore, more contact with needles, greater the chance of getting the disease.
Surprisingly the disease prevalence among homosexual and bisexual people and prostitutes is lower than that of intravenous drug users, indicating the lesser chance of acquiring the disease by unprotected sex.
References:
Kumar and Clark’s Clinical Medicine 7th Edition
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