Can we use the phrases "pass a virus to someone" and "pass a virus on to someone" interchangeably? I am guessing the second example I gave below fine but how about the first one? I know that it is idiomatic to use "pass something on to somebody" when talking about a disease, but using it without the preposition "on" sounds off to me. Do you think either of the examples below is fine? I am guessing "...pass the virus on to..." is the only correct one even though the object is a virus rather than a disease.
Don't go to work if you feel unwell. You may pass the virus to the others.
Don't go to work if you feel unwell. You may pass the virus on to the others.
Context: I am talking to someone who seems to feel really unwell and so might have caught the Corona virus.