Is it a mortal sin for a Catholic to knowingly pass on his/her sickness to another person?

According to Catholic teaching, would it be a mortal sin if a Catholic were to knowingly pass on their sickness to another person? For example, say that a Catholic has an important project that they have been working on at their workplace and he/she is very close to finishing this project, however, he/she unfortunately comes down with the flu and so he/she needs to take time off from work to recover from the flu. Say that this Catholic were to then decide to return to work before he/she has fully recovered from the flu, because he/she is afraid or paranoid that their project will fail due to their absence, and he/she believes that a failed project could lead to them being terminated from their job. A few days later, several of his/her coworkers come down with the flu and they have to miss work due to coming down with the flu. Has this Catholic commited a mortal sin by knowingly passing on the flu to his/her coworkers?