A nurse develops clinical symptoms consistent with hepatitis. She recalls sticking herself with a needle approximately 4 months before after drawing blood from a patient. Serologic tests for HBsAg, antibodies to HBsAg, and hepatitis A virus (HAV) are all negative; however, she is positive for IgM core antibody. The nurse
Does not have hepatitis B Has hepatitis A Is in the late stages of hepatitis B infection Is in the "window" (after the disappearance of HBsAg and before the appearance of anti-HBsAg)