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

0 cases, with Russian Federation ahead.

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

32 years are reported by both, from 1991 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.

Russian Federation vs Sierra Leone: Reported versus estimated cases of polio

Russian Federation

0 cases

in 2023

Sierra Leone

0 cases

in 2023

Russian Federation rank

26th

Sierra Leone rank

26th

Reported versus estimated cases of polio over time

Russian Federation
Sierra Leone

How they compare

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

The two have swapped places 6 times across 32 shared years of data; in 1991 it was Sierra Leone ahead.

Russian Federation ranks 26th and Sierra Leone ranks 26th of 199 countries.

Across the 4 decades both report, Russian Federation averaged higher in 2 and Sierra Leone in 2.

Head to head by decade

Decade	Russian Federation	Sierra Leone	Difference	Ahead
1990s	24 cases	11.38 cases	12.62 cases	Russian Federation
2000s	0 cases	4.5 cases	4.5 cases	Sierra Leone
2010s	1.4 cases	0.1 cases	1.3 cases	Russian Federation
2020s	0 cases	3.75 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, Russian Federation or Sierra Leone?: Russian Federation, at 0 cases against 0 cases in Sierra Leone as of 2023.
What is the difference in reported versus estimated cases of polio between Russian Federation and Sierra Leone?: 0 cases, with Russian Federation ahead.
How many years of comparable data are there for Russian Federation and Sierra Leone?: 32 years are reported by both, from 1991 to 2023.
How do Russian Federation and Sierra Leone rank globally for reported versus estimated cases of polio?: Russian Federation ranks 26th and Sierra Leone 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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Russian Federation vs Sierra Leone: Reported versus estimated cases of polio. Statizoid, drawing on World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data. Retrieved 03 September 2026, from https://reference.statizoid.com/compare/reported-vs-estimated-total-number-of-paralytic-polio-cases-globally/russian-federation/sierra-leone/

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<a href="https://reference.statizoid.com/compare/reported-vs-estimated-total-number-of-paralytic-polio-cases-globally/russian-federation/sierra-leone/">Russian Federation vs Sierra Leone: 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.