What causes fever after receiving the fourth dose of the 13-valent pneumococcal vaccine?

Fever generally refers to an elevated body temperature. After receiving the fourth dose of the 13-valent pneumococcal vaccine, fever may occur as a possible adverse reaction to the vaccine or due to a coincidental viral cold. Therefore, symptoms such as fever, rash, diarrhea, and increased sleep may appear after vaccination.

1. Vaccine-related adverse reactions

Since vaccines are biological products made from pathogenic microorganisms, individuals with weakened immune systems may develop local immune responses or allergic reactions after vaccination, such as fever, rashes, laryngeal edema, or difficulty breathing. If symptoms are mild, increasing fluid intake, getting adequate rest, and avoiding fatigue and staying up late can help the adverse reactions resolve on their own.

2. Viral cold

When the body's immunity is low, it may become further weakened after vaccination, leaving the body vulnerable. Viruses may invade the respiratory tract, leading to upper respiratory tract infections and resulting in viral colds. Symptoms may include fever, runny nose, and sneezing. Under the guidance of a healthcare professional, patients may take antipyretic medications such as acetaminophen granules or ibuprofen suspension to relieve fever.

3. Precautions after vaccination

It is not recommended to bathe on the day of vaccination, as this helps reduce bacterial invasion at the injection site and lowers the risk of infection or pain. Avoid staying up late and overexertion; maintain a light and easily digestible diet.

If severe discomfort occurs after vaccination, prompt medical attention is advised.