Furthermore, people who had been infected with DENV-1 during the 1977-79 outbreak and secondarily infected with DENV-2 in 1997 had a 3-4 fold increased probability of developing severe disease than those secondarily infected with DENV-2 in 1981.
Ademais, as persoas que foran infectadas con DENV-1 durante a epidemia de 1977-79 e infectadas secundariamente con DENV-2 en 1997 tiñan de 3 a 4 veces máis probabilidade de desenvolver unha enfermidade grave que as que foran infectadas secundariamente polo DENV-2 en 1981.