estaban contagiando
Imperfecto progresivo para el sujetoellos/ellas/ustedesdel verbocontagiar.

contagiar

Esta institución tenía filiales en varios países y las personas se estaban contagiando, como si un sentimiento sublime estuviese brotando y creciendo progresivamente.
That institution had branches in several countries and the people were being touched. It was as if sublime feeling was sprouting and growing progressively.
Palabra del día
el hombre lobo