What determines if a person has "immune due to natural infection" status?

What determines if a person has "immune due to natural infection" status?

• A. HBsAg: pos, Anti-HBc: neg, Anti-HBs: pos
• B. HBsAg: neg, Anti-HBc: neg, Anti-HBs: pos
• C. HBsAg: neg, Anti-HBc: pos, Anti-HBs: neg
• D. HBsAg: pos, Anti-HBc: pos, IgM anti-HBc: neg, Anti-HBs: neg

Answer: (B)

The correct answer is that a person has "immune due to natural infection" status when specific serological markers are present or absent indicating their immunity and history of infection. In this case, the individual presents with HBsAg negative, Anti-HBc positive, and Anti-HBs positive. Having HBsAg negative indicates that there is no active hepatitis B virus in the bloodstream, suggesting the person is not currently infected. The presence of Anti-HBc indicates past exposure to the hepatitis B virus, reflecting a previous infection. The presence of Anti-HBs signifies the development of antibodies as a result of recovering from the infection, indicating immunity. Together, these serological markers confirm that the individual has experienced natural infection with hepatitis B and has since developed immunity due to that infection. Thus, the presence of Anti-HBc and Anti-HBs, coupled with the absence of HBsAg, determines the status of having achieved immunity from natural infection.

The correct answer is that a person has "immune due to natural infection" status when specific serological markers are present or absent indicating their immunity and history of infection. In this case, the individual presents with HBsAg negative, Anti-HBc positive, and Anti-HBs positive.

Having HBsAg negative indicates that there is no active hepatitis B virus in the bloodstream, suggesting the person is not currently infected. The presence of Anti-HBc indicates past exposure to the hepatitis B virus, reflecting a previous infection. The presence of Anti-HBs signifies the development of antibodies as a result of recovering from the infection, indicating immunity.

Together, these serological markers confirm that the individual has experienced natural infection with hepatitis B and has since developed immunity due to that infection. Thus, the presence of Anti-HBc and Anti-HBs, coupled with the absence of HBsAg, determines the status of having achieved immunity from natural infection.