How long after receiving the measles vaccine does fever usually occur?

Fever in clinical terms refers to an elevated body temperature, and the measles vaccine clinically refers to the measles attenuated live vaccine. It is not possible to definitively determine how long after receiving the measles attenuated live vaccine a fever might occur, as some individuals do not develop fever at all following vaccination. However, for those with weaker constitutions, fever may appear 1 to 2 days after vaccination. Details are as follows:

The measles attenuated live vaccine is a type of passive immunizing agent. After injection, it stimulates the body to produce corresponding antibodies, thereby providing protection against measles. When administered correctly according to standard protocols, the vaccine is generally effective, stable, and safe, and many recipients do not experience fever. However, individuals with poorer physical conditions may exhibit a more pronounced immune response after vaccination, leading to increased heat production over heat dissipation, resulting in fever. In people with faster metabolism, fever typically develops around one day after vaccination; in those with slower metabolism, fever may occur about two days post-vaccination.

Before receiving the measles attenuated live vaccine, individuals should honestly inform their doctor about their health status to avoid contraindications. If fever does occur, it can be managed with methods such as cold compresses, or by seeking timely medical attention at a hospital.