Background COVID-19 is a highly transmissible illness caused by SARS-CoV-2. The disease has affected more than 200 countries, and the measures that have been implemented to combat its spread, as there is still no vaccine or definitive medication, have been based on supportive interventions and drug repositioning. Brazil, the largest country in South America, has had more than 140,000 recorded deaths and is one of the most affected countries. Despite the extensive quantity of scientifically recognized information, there are still conflicting discussions on how best to face the disease and the virus, especially with regard to social distancing, preventive methods, and the use of medications. Objective The main purpose of this study is to evaluate the Brazilian population’s basic knowledge about COVID-19 to demonstrate how Brazilians are managing to identify scientifically proven information. Methods A cross-sectional study design was used. An original online questionnaire survey was administered from June 16 to August 21, 2020, across all five different geopolitical regions of the country (ie, the North, Northeast, Center-West, Southeast, and South). The questionnaire was comprised of questions about basic aspects of COVID-19, such as the related symptoms, conduct that should be followed when suspected of infection, risk groups, prevention, transmission, and social distancing. The wrong questionnaire response alternatives were taken from the fake news combat website of the Brazilian Ministry of Health. Participants (aged ≥18 years) were recruited through social networking platforms, including Facebook, WhatsApp, and Twitter. The mean distributions, frequencies, and similarities or dissimilarities between the responses for the different variables of the study were evaluated. The significance level for all statistical tests was less than .05. Results A total of 4180 valid responses representative of all the states and regions of Brazil were recorded. Most respondents had good knowledge about COVID-19, getting an average of 86.59% of the total score with regard to the basic aspects of the disease. The region, education level, age, sex, and social condition had a significant association (P<.001) with knowledge about the disease, which meant that women, the young, those with higher education levels, nonrecipients of social assistance, and more economically and socially developed regions had more correct answers. Conclusions Overall, Brazilians with social media access have a good level of basic knowledge about COVID-19 but with differences depending on the analyzed subgroup. Due to the limitation of the platform used in carrying out the study, care should be taken when generalizing the study findings to populations with less education or who are not used to accessing social networking platforms.

BACKGROUND Coronavirus disease 2019 (COVID-19) is a highly transmissible illness caused by severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2). The disease has affected more than 200 countries and the measures that have been implemented to combat its spread, as there is still no vaccine or definitive medication, have been based on supportive interventions and drug repositioning. Brazil, the largest country in South America, has had more than 140,000 recorded deaths and is one of the most affected countries. Despite the extensive quantity of scientifically recognized information, there are still conflicting discussions on how best to face the disease and the virus, especially with regard to social distancing, preventive methods, and the use of medications. OBJECTIVE Thus, the main purpose of this work was to evaluate the Brazilian population’s basic knowledge about COVID-19 to demonstrate how Brazilians are managing to identify only scientifically proven information. METHODS A cross-sectional study design was used. An original online questionnaire survey was administered from June 16 to August 21, 2020 across all five different geopolitical regions of the country (i.e., the North, Northeast, Center-West, Southeast, and South). The questionnaire was comprised of questions about basic aspects of COVID-19, such as the related symptoms, conduct that should be followed when suspected of infection, risk groups, prevention, transmission, and social distancing. The wrong questionnaire response alternatives were taken from the fake news combat website of Brazil’s health ministry. Participants (aged ≥18 years) were recruited through social network platforms including Facebook, WhatsApp, and Twitter. RESULTS A total of 4,180 valid responses representative of all the states and regions of Brazil were recorded. Most respondents had good knowledge about COVID-19, getting an average of 86.59% of the total score, with regard to the basic aspects of the disease. Region, educational level, age, sex, and social condition had a significant association (p < .0001) with knowledge about the disease, which meant that women, the young, those with higher educational levels, non-recipients of social assistance, and more economically and socially developed regions had more correct answers. CONCLUSIONS Overall, Brazilians with social media access can be said to have a good level of basic knowledge about COVID-19, but with differences depending on the analyzed subgroup. Due to the limitation of the platform used in carrying out the study, care should be taken when generalizing the study findings to populations unschooled or who are not used to accessing social network platforms.

This was a cross-sectional, anonymous, online survey aimed at assessing the perceptions and basic knowledge of COVID-19, a highly transmissible disease caused by SARS-CoV-2, in a sample population in the Triângulo Mineiro region, Minas Gerais, Brazil. A questionnaire devised by the researchers and distributed through social media was applied between June 16, 2020 and August 21, 2020. The survey consisted of questions about the basic aspects of COVID-19, which included symptoms, risk groups, suspicion of infection, prevention, transmission, and perception regarding social isolation. The average distribution, frequencies, similarities and differences between the responses for the different variables were evaluated. Five hundred twenty valid responses were obtained from participants aged ≥18 years. Most of the respondents showed satisfactory basic knowledge of COVID-19. Moreover, the data showed that the participants scored an average of 87.6%. Sex, age, and socioeconomic vulnerability presented a statistically significant link with knowledge of the disease; women, young participants, and the least socioeconomically vulnerable had the highest scores. This study indicated that the population in the Triângulo Mineiro region able to access social networking platforms were basically well informed regarding COVID-19, although differences were observed depending on the group analyzed. KEY WORDS: Coronavirus; knowledge; surveys and questionnaires.