# Immunization errors of COVID-19 vaccines in Minas Gerais

**Authors:** Wiara Viana Ferreira, Thayane Ingrid Xavier de Andrade, Thays Cristina Pereira Barbosa, Rillary Carvalho dos Santos, Stênio Henrique Oliveira, Vinícius Carvalho Guimarães, Eliete Albano de Azevedo Guimarães, Valeria Conceição de Oliveira, Wiara Viana Ferreira, Thayane Ingrid Xavier de Andrade, Thays Cristina Pereira Barbosa, Rillary Carvalho dos Santos, Stênio Henrique Oliveira, Vinícius Carvalho Guimarães, Eliete Albano de Azevedo Guimarães, Valeria Conceição de Oliveira

PMC · DOI: 10.1590/0034-7167-2023-0525 · Revista Brasileira de Enfermagem · 2025-08-08

## TL;DR

This study analyzed vaccination errors for COVID-19 in Minas Gerais, finding regional differences and underreporting.

## Contribution

It highlights regional disparities in vaccine error reporting and identifies underreporting in the state.

## Key findings

- Only 44.7% of municipalities reported immunization errors, totaling 2,724 reports.
- The Vale do Aço region had the highest error rate at 14.4 per 100,000 doses.
- Pfizer had the lowest error rate, and vaccine type errors were most common at 37.3%.

## Abstract

to analyze immunization errors related to COVID-19 vaccines in Minas Gerais.

a descriptive epidemiological study, carried out in Minas Gerais with data from e-SUS Notifica in 2021. Descriptive analysis and calculation of the incidence rate by health macro-regions of the state were performed.

of the 853 municipalities, only 381 (44.7%) reported some immunization error, totaling 2,724 reports. The incidence of errors reported in the state was 7.8/100 thousand doses applied, with the Vale do Aço macro-region (14.4/100 thousand) having the highest incidence. The most frequent error was the type of vaccine used (37.3%), and the Pfizer vaccine had the lowest incidence of error.

the COVID-19 vaccine immunization errors reported in Minas Gerais point to the heterogeneity in incidence rates in the various macro-regions of the state, in addition to the underreporting of these errors.

analisar os erros de imunização relacionados às vacinas contra COVID-19 em Minas Gerais.

estudo epidemiológico descritivo, realizado em Minas Gerais com dados do e-SUS Notifica no ano de 2021. Foram realizados análise descritiva e cálculo da taxa de incidência por macrorregiões de saúde do estado.

dos 853 municípios, apenas 381 (44,7%) notificaram algum erro de imunização, totalizando 2.724 notificações. A incidência dos erros notificados no estado foi de 7,8/100 mil doses aplicadas, sendo a macrorregião do Vale do Aço (14,4/100 mil) a de maior incidência. O erro mais frequente foi o tipo de imunológico utilizado (37,3%), e a vacina da Pfizer teve a menor incidência de erro.

os erros de imunização da vacina contra COVID-19 notificados em Minas Gerais apontam para a heterogeneidade nas taxas de incidência das diversas macrorregionais do estado, além da subnotificação desses erros.

## Linked entities

- **Diseases:** COVID-19 (MONDO:0100096)

## Full-text entities

- **Diseases:** COVID-19 (MESH:D000086382)

## Full text

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## Figures

2 figures with captions in the complete paper: https://tomesphere.com/paper/PMC12334198/full.md

## References

35 references — full list in the complete paper: https://tomesphere.com/paper/PMC12334198/full.md

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Source: https://tomesphere.com/paper/PMC12334198