What is the difference in reported versus estimated cases of polio between Sierra Leone and Thailand?

0 cases, with Sierra Leone ahead.

How many years of comparable data are there for Sierra Leone and Thailand?

43 years are reported by both, from 1980 to 2023.

Where does this data come from?

World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data, published as Reported versus estimated cases of polio. Statizoid refreshes it automatically from the source and publishes the full history for both places.

Sierra Leone vs Thailand: Reported versus estimated cases of polio

Sierra Leone

0 cases

in 2023

Thailand

0 cases

in 2023

Sierra Leone rank

26th

Thailand rank

26th

Reported versus estimated cases of polio over time

Sierra Leone
Thailand

How they compare

Sierra Leone currently reports 0 cases against 0 cases in Thailand, a difference of 0 cases.

The two have swapped places 10 times across 43 shared years of data; in 1980 it was Thailand ahead.

Sierra Leone ranks 26th and Thailand ranks 26th of 199 countries.

Across the 5 decades both report, Sierra Leone averaged higher in 4 and Thailand in 1.

Head to head by decade

Decade	Sierra Leone	Thailand	Difference	Ahead
1980s	39.3 cases	127.2 cases	87.9 cases	Thailand
1990s	14.33 cases	11.33 cases	3 cases	Sierra Leone
2000s	4.5 cases	2 cases	2.5 cases	Sierra Leone
2010s	0.1 cases	0 cases	0.1 cases	Sierra Leone
2020s	3.75 cases	0 cases	3.75 cases	Sierra Leone

Averages of every year both report within each decade.

Frequently asked questions

Which has higher reported versus estimated cases of polio, Sierra Leone or Thailand?: Sierra Leone, at 0 cases against 0 cases in Thailand as of 2023.
What is the difference in reported versus estimated cases of polio between Sierra Leone and Thailand?: 0 cases, with Sierra Leone ahead.
How many years of comparable data are there for Sierra Leone and Thailand?: 43 years are reported by both, from 1980 to 2023.
How do Sierra Leone and Thailand rank globally for reported versus estimated cases of polio?: Sierra Leone ranks 26th and Thailand ranks 26th of 199 countries.
Where does this data come from?: World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data, published as Reported versus estimated cases of polio. Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Sierra Leone vs Thailand: Reported versus estimated cases of polio. Statizoid, drawing on World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data. Retrieved 01 September 2026, from https://reference.statizoid.com/compare/reported-vs-estimated-total-number-of-paralytic-polio-cases-globally/sierra-leone/thailand/

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<a href="https://reference.statizoid.com/compare/reported-vs-estimated-total-number-of-paralytic-polio-cases-globally/sierra-leone/thailand/">Sierra Leone vs Thailand: Reported versus estimated cases of polio</a> — Statizoid

About this data

Indicator: Reported versus estimated cases of polio
Unit: cases
Source: World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data
Licence: CC BY 4.0 (Our World in Data)
Coverage: 199 places, 7,608 data points, 1980–2023
Last refreshed: 28 August 2026

Sum of wild poliovirus cases and circulating vaccine derived poliovirus cases.