Actually a significant population in the US was infected by blood transfusion; the US didn't start properly/universally screening blood and taking precautions for hep C until 1992.
This is why there's a spike in infection rate among older people, and why hep C is considered a looming cost crisis for Medicare -- we don't yet know the full extent of the infectious disaster that was unscreened blood, but it's ticking away inside anyone who received a transfusion prior to 1992.
This is why there's a spike in infection rate among older people, and why hep C is considered a looming cost crisis for Medicare -- we don't yet know the full extent of the infectious disaster that was unscreened blood, but it's ticking away inside anyone who received a transfusion prior to 1992.