 [ Symptoms ] what causes the cracks and splits on the ends of the fingers and what is the best way to treat [ Disease ] influenza is contagious a day before you know you have it and about two days later estimate tamiful is given for five days and must be given in the first two days of an influenza infection so you are about a week into this illness at least that is assuming you were accurately diagnosed i do not believe that you would be contagious at this point besides your one year old grandson should have been immunized for influenza it is offered at age six months