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Glossary explainerWorldwide

What does endemic mean for a tick-borne disease?

Endemic means a disease or pathogen is consistently present at an expected level in a particular population or area; it does not mean every tick or resident is infected.

Reviewed by VuxLore® Knowledge Team For Everyone

Short answer

Endemic means a disease or pathogen is consistently present at an expected level in a particular population or area; it does not mean every tick or resident is infected.

At a glance

Endemicity is specific to place, time, pathogen and population.

Key takeaways

• Endemic is not the same as universal.

• Risk still varies within an endemic region.

• Surveillance can change the recognised boundary.

A population-level term

Public-health authorities use surveillance over time to describe expected occurrence. An endemic disease may have seasonal peaks, local hotspots and years with unusual activity.

Use the term with a boundary

State which disease, geographic unit and period are meant. Travellers should use current advice because vector and pathogen distributions can change.

Sources and further reading