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Since it is a viral infection it is self limiting and if needed antivirals can be used but presently since he has recovered then you have to wait and continue the antibiotics and follow up with your doctor.It will resolve but take time.Mumps is viral infection and in adolescent and adult males carry an up to 30% risk that the testes may become infected (orchitis
), which can be quite painful; about half of these infections result in testicular atrophy
, and in rare cases sterility
Take care and wish him speedy recovery.