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A new study looking at the coronavirus epidemic in Brazil has found a link between the spread of the virus and past outbreaks of dengue fever, suggesting that exposure to mosquito-borne diseases may provide some level of immunity to Covid-19. reports Reuters. .
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The study, coordinated by Miguel Nicolelis, a professor at Duke University, which has not yet been officially published, compares the geographical distribution of coronavirus cases with the spread of dengue disease in 2019 and 2020, News.ro reports.
Places with low rates of new coronavirus infections and a slow increase in the number of cases are areas where severe outbreaks of dengue fever have occurred this year or last year, Nicolelis found.
“This extraordinary finding raises the possibility of an immune cross-reaction between dengue flavivirus serotype and SARS-CoV-2,” the study said, referring to antibodies against dengue virus and novel coronavirus.
“If proven correct, this hypothesis may mean that dengue infection or immunization with a safe and effective dengue vaccine could produce some level of immunological protection against the new coronavirus,” added the professor.
Nicolelis added that the results are particularly interesting because previous studies have shown that people with dengue antibodies can have a false positive result for antibodies to Covid-19, even if they have not been infected with the new coronavirus.
The study, to be published in a scientific journal, reveals a significant correlation between incidence, mortality and the low growth rate of Covid-19 cases in Brazilian populations where antibody levels against dengue disease are high. .
Brazil ranks third in the world in terms of the number of Covid-19 infections, with more than 4.4 million cases, ahead of the United States and India.
In countries like Paraná, Santa Catarina, Rio Grande do Sul, Mato Grosso do Sul, and Minas Gerais, where a high incidence of dengue cases was recorded in 2019 and 2020, Covid-19 reached the level of comparative community transmission much later. with states like Amapá, Maranhão and Pará, which had fewer cases of Dengue.
The team found similar relationships between dengue outbreaks and the slower spread of Covid-19 in other parts of Latin America, as well as in Asia and islands in the Pacific and Indian Oceans.
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