Introduction

The novel Coronavirus disease (COVID-19) is caused by SARS-CoV-2 and represents the agent responsible for a respiratory and metabolic disease with a high fatality rate, remaining a public health problem to this day. There has been an exacerbation of social inequalities experienced in Brazil and worldwide. Notably, the absence of a consolidated and universal healthcare system has contributed to the increased inequalities and survival opportunities for those affected by SARS-CoV-2 infection and manifestation of COVID-19. The southern region has become the second region with the highest number of cases in Brazil.

Objective

To avaluate the epidemiological outcomes of incidence, lethality, and mortality among the states of Rio Grande do Sul and Paraná in the southern region of Brazil.

Methods

An ecological time-series study was conducted using official secondary data on COVID-19 cases and deaths publicly disclosed by the health departments of the states of Rio Grande do Sul and Paraná. Time series were constructed applying the Prais-Winsten regression model. Statistical analyses were performed using STATA 14.0 software.

Results

It was observed that for the state of Rio Grande do Sul, the trends regarding incidence were increasing in 2020 and decreasing in 2021 (p<0.05). Regarding mortality, it increased in 2020 and decreased in 2021 and 2022 (p<0.05). When assessing lethality, a decreasing trend was observed for the entire period (p<0.05). In relation to Paraná, incidence increased in 2020 and over the entire period, while it decreased in 2021 and 2022 (p<0.05). Mortality was stationary in 2020 and decreased in 2021 and 2022 (p<0.05).

Conclusion

The COVID-19 pandemic is a serious public health problem in the states of Paraná and Rio Grande do Sul. Paraná presented a more severe epidemiological outcome compared to Rio Grande do Sul.