Post exposure active immunization can be done fora) Rabiesb) Measlesc) Cholerad) Yellow fever
First, I remember that active immunization involves administering a vaccine to stimulate the body's immune response. Post-exposure prophylaxis (PEP) is when you give the vaccine after someone has been exposed to a pathogen to prevent the disease.
Rabies: I know that rabies is usually given as PEP. It's a post-exposure treatment, which includes both passive immunization (like rabies immune globulin) and active with the vaccine. So rabies (option a) is correct.
Measles: Measles vaccine is typically given pre-exposure, but if someone is exposed and hasn't been vaccinated, they might get the vaccine within a certain time frame. I think the measles vaccine can be given post-exposure to prevent or mitigate the disease if administered within 72 hours. So option b might be correct too.
Cholera: Cholera vaccines are usually given to people traveling to endemic areas as pre-exposure. I don't recall post-exposure cholera vaccines being a standard practice. So option c is probably incorrect.
Yellow fever: The vaccine is given pre-exposure, but if someone is exposed, they might get the vaccine quickly to prevent infection. However, yellow fever is usually considered a pre-travel vaccine. Maybe there's some post-exposure use, but I'm not sure.
Wait, the question is about active immunization. Passive immunization involves antibodies, but active is the vaccine. So for rabies, after exposure, you get both the vaccine (active) and immune globulin (passive). For measles, post-exposure vaccination can prevent or reduce severity if given within 72 hours. Yellow fever's post-exposure use is less common. Cholera's vaccine isn't used post-exposure.
So the correct answers are a and b. But the options are a, b, c, d. The question is multiple-choice with options a to d. The correct answer might be both a and b, but the options are separate. Wait, the original question is presented as a single correct answer? Or is it multiple? The way the question is written, it's four options, and the correct answer is likely a and b. But the user's correct answer is given as A. B. C. D., so maybe the correct answer is a and b. However, in the original question, the options are a) Rabies, b) Measles, c) Cholera, d) Yellow fever. So the correct answer is a and b. But the user's correct answer section is left blank. Wait, the user provided the correct answer as "A. B. C. D." but then the correct answer is to be filled. Let me check again.
Wait, the user provided the question with options a to d and then the correct answer as "A. B. C. D." but in the problem statement, the correct answer is given as "Correct Answer: .". So the user is expecting me to determine the correct answer among the options. The options are a) Rabies, b) Measles, c) Cholera, d) Yellow fever.
So, the