“Our data shows that Oropouche virus is massively under-diagnosed in Latin America,” says Drexler, who also conducts research at the German Center for Infection Research (DZIF). “In some areas, at least one person in ten has experienced a prior infection with the pathogen.”

More widespread than thought – but still insufficiently investigated

Oropouche virus causes nonspecific symptoms such as fever, chills, headache, pain in the limbs, and, in some cases, nausea and skin rashes. For a long time, the disease was considered to be predominantly mild, and reports of more severe bouts, including meningitis, were rare.