Flipped through the article, my guess is that it was a case of “Person X was infected with both (or used to have Dengue), and they tested Dengue first so they dismissed them without even considering that they had both!”
(Antibody-tests are usually highly-specific, and Dengue and Coronavirus are pretty different viruses, so I’m inclined to trust that the “Dengue +” result was correct and just how they handled that information was wrong.)
Flipped through the article, my guess is that it was a case of “Person X was infected with both (or used to have Dengue), and they tested Dengue first so they dismissed them without even considering that they had both!”
(Antibody-tests are usually highly-specific, and Dengue and Coronavirus are pretty different viruses, so I’m inclined to trust that the “Dengue +” result was correct and just how they handled that information was wrong.)