How to Say "transmittable" in Spanish
The Spanish word for “transmittable” is “contagioso” — A2 level. This is a very common word in everyday Spanish.
Examples
Ten cuidado, el resfriado es muy contagioso.
Be careful, the cold is very contagious.
No vengas a la oficina si tienes algo contagioso.
Don't come to the office if you have something contagious.
Los médicos dicen que el virus ya no es contagioso después de tres días.
Doctors say the virus is no longer contagious after three days.
Matching the Ending
Since this is an adjective, you must change the 'o' to an 'a' when describing a feminine noun. For example: 'una enfermedad contagiosa' (a contagious illness).
Using it with 'Ser'
Even though a sickness might be temporary, we use the verb 'ser' (to be) because we are describing a characteristic of the virus or the person's current state of being able to spread it.
Confusing 'Infectious' and 'Contagious'
Mistake: “Using 'infeccioso' for everything.”
Correction: While similar, 'contagioso' specifically means it can spread from person to person. A bacterial infection might be 'infeccioso' but not 'contagioso' if it can't be caught by others.
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