Adverse reactions to polyvalent pneumococcal vaccine

Area of Science:

• Immunology
• Vaccinology
• Public Health

Background:

• Polyvalent pneumococcal polysaccharide vaccine is crucial for preventing pneumococcal infections.
• Understanding vaccine adverse reactions is vital for vaccine safety and public trust.

Purpose of the Study:

• To evaluate adverse reactions to the polyvalent pneumococcal polysaccharide vaccine.
• To assess the influence of vaccinee age and route of administration on reaction profiles.

Main Methods:

• A randomized single-blind study involving 181 older adults (60-85 years) receiving subcutaneous pneumococcal or influenza vaccine.
• Comparison of reactions in 100 younger healthy firemen (mean age 31 years) receiving pneumococcal vaccine.
• Analysis of local reactions (soreness, erythema, induration) and systemic reactions (fever) based on age and administration route (subcutaneous vs. intramuscular).

Main Results:

• Older adults receiving subcutaneous vaccines reported local reactions in 90% of cases, with mild fever in 3.3%.
• Younger adults experienced significantly more local soreness (76% vs. ~33%, p<0.001) and fever (12% vs. 3.3%, p<0.05).
• Intramuscular injections led to longer-lasting soreness (42.5h vs. 32.5h, p<0.05), while subcutaneous injections caused more erythema (80% vs. 38%, p<0.001).

Conclusions:

• Adverse reaction profiles for pneumococcal vaccines differ significantly between younger and older populations.
• Route of administration impacts local reaction characteristics, with implications for vaccine administration guidelines.
• Higher antibody concentrations correlated with the presence of vaccine reactions.