How many years of comparable data are there for Brazil and Iran, Islamic Republic of?

44 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.

Brazil vs Iran, Islamic Republic of: Reported versus estimated cases of polio

Brazil

0 cases

in 2023

Iran, Islamic Republic of

0 cases

in 2023

Brazil rank

26th

Iran, Islamic Republic of rank

26th

Reported versus estimated cases of polio over time

Brazil
Iran, Islamic Republic of

How they compare

Brazil currently reports 0 cases against 0 cases in Iran, Islamic Republic of, a difference of 0 cases.

The two have swapped places 3 times across 44 shared years of data; in 1980 it was Brazil ahead.

Brazil ranks 26th and Iran, Islamic Republic of ranks 26th of 199 countries.

Across the 5 decades both report, Brazil averaged higher in 1 and Iran, Islamic Republic of in 2.

Head to head by decade

Decade	Brazil	Iran, Islamic Republic of	Difference	Ahead
1980s	293 cases	87.1 cases	205.9 cases	Brazil
1990s	0 cases	44.7 cases	44.7 cases	Iran, Islamic Republic of
2000s	0 cases	0.3 cases	0.3 cases	Iran, Islamic Republic of
2010s	0 cases	0 cases	0 cases	—
2020s	0 cases	0 cases	0 cases	—

Averages of every year both report within each decade.

Frequently asked questions

Which has higher reported versus estimated cases of polio, Brazil or Iran, Islamic Republic of?: Brazil, at 0 cases against 0 cases in Iran, Islamic Republic of as of 2023.
What is the difference in reported versus estimated cases of polio between Brazil and Iran, Islamic Republic of?: 0 cases, with Brazil ahead.
How many years of comparable data are there for Brazil and Iran, Islamic Republic of?: 44 years are reported by both, from 1980 to 2023.
How do Brazil and Iran, Islamic Republic of rank globally for reported versus estimated cases of polio?: Brazil ranks 26th and Iran, Islamic Republic of 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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Brazil vs Iran, Islamic Republic of: Reported versus estimated cases of polio. Statizoid, drawing on World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data. Retrieved 31 August 2026, from https://reference.statizoid.com/compare/reported-vs-estimated-total-number-of-paralytic-polio-cases-globally/brazil/iran-islamic-rep/

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<a href="https://reference.statizoid.com/compare/reported-vs-estimated-total-number-of-paralytic-polio-cases-globally/brazil/iran-islamic-rep/">Brazil vs Iran, Islamic Republic of: 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.