A 9-month-old un-immunized child was brought to the dispensary, which vaccination should be given to this baby at first visit?
**Core Concept**
The question requires knowledge of the recommended vaccination schedule for infants in a country with typical immunization programs. The correct answer will be based on the standard schedule, which includes a series of vaccinations to protect against serious diseases such as diphtheria, tetanus, pertussis, polio, and Haemophilus influenzae type b (Hib).
**Why the Correct Answer is Right**
At 9 months of age, the child is due for a series of vaccinations, including the third dose of DTP (diphtheria, tetanus, and pertussis) vaccine, the third dose of Hib vaccine, and the second dose of poliovirus vaccine. The DTP vaccine is a combination vaccine that protects against diphtheria, tetanus, and pertussis, which are serious infections that can cause illness and even death. The Hib vaccine protects against Haemophilus influenzae type b, a bacterium that can cause severe infections such as meningitis and pneumonia.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely incorrect because the first visit is not typically when the child receives the third dose of DTP or Hib vaccines. The child may receive the first dose of these vaccines, but not the third.
**Option B:** This option may be incorrect because the child is not due for the first dose of the vaccine at 9 months of age. The child may have already received the first dose, or the question may be asking for a vaccine that is not typically given at this age.
**Option C:** This option is likely incorrect because the child is not due for the second dose of the vaccine at 9 months of age. The child may have already received the second dose, or the question may be asking for a vaccine that is not typically given at this age.
**Clinical Pearl / High-Yield Fact**
The recommended vaccination schedule for infants varies by country and region, but the DTP and Hib vaccines are typically given in a series of doses starting at 2 months of age, with boosters given at 4 and 6 months, and again at 12-18 months.
**Correct Answer: C. DTP vaccine (third dose)**