Does prior infection provide lifelong immunity?

Comprehensive answer, prevention tips, related terms, and key take-aways.

No. Natural infection confers only partial, waning immunity:

• Dogs become susceptible again within 6–12 months.
• Human pertussis immunity decays after 4–12 years, whether from infection or vaccination.

Regular boosters or revaccination are required for sustained protection.

Key Take-Aways

  • Immunity fades—boosters are essential.
  • Dogs - annual; humans - Tdap every 10 years.
  • Natural infection is not lifelong insurance.