Which vaccine slightly increases the risk of febrile seizures in a 12-month-old child for up to 2 weeks after administration?

The MMR vaccine, which stands for measles, mumps, and rubella, has been associated with a slight increase in the risk of febrile seizures in young children, particularly those around 12 months of age. This risk is linked to the vaccine's ability to induce a mild fever as part of the immune response, which can occur within 1 to 2 weeks after vaccination.

Febrile seizures are generally benign and typically resolve quickly without causing long-term harm. It is important to note that while there is a slight increase in risk, the benefits of vaccination, such as preventing serious diseases like measles, mumps, and rubella, far outweigh the risks associated with febrile seizures.

In contrast, the other vaccines listed, such as DTaP, varicella, and influenza, do not have the same association with an increased risk of febrile seizures after administration. This specificity underlines the unique aspect of MMR in this context.