This is the 7983rd most frequent Catalan word.
contagiosa
"Contagiosa" means "contagious" in English.
Here, 'contagiosa' is used metaphorically to describe mental or emotional effects being spread.
La seva rialla és contagiosa.
Her laughter is contagious.
Here, 'contagiosa' is used literally to describe the flu as a disease that can spread from one person to another.
La grip que va agafar era molt contagiosa.
The flu she caught was very contagious.
Here, 'contagiosa' is again used metaphorically to describe an atmosphere or mood that affects others.